6 Smallest Mini Split Air Conditioner On The Market

If you want to cool a small room but don’t want to install ductwork, then you have to decide the type of room air conditioner that would suit your needs. Would it be a portable air conditioner, window air conditioner, or small mini-split system?

All of these air conditioning units have their pros and cons. However, if you want to invest in a cooling system for years to come, choose the smallest mini air conditioner. These units are energy-efficient and allow you to heat and cool individual rooms.

Most of the smallest mini split ac I’ve reviewed have cooling capacities between 9000 BTUs -12000 BTUs. If that’s is too much for your room, you can go for Mitsubishi 6,000 Single Zone Ductless Mini Split.

Remember, these are single-zone units that are ideal for small rooms between 100 to 450 square feet. For multizone mini-splits, you’ll have to choose a higher BTU rating.

If you’re in a hurry, here is our top pick

Pioneer Air Conditioner WYS009A-20 Wall Mount...
  • Save money all year-round with a highly efficient ductless mini split inverter+ heat pump system
  • Ultra-silent and beautifully built: perfect for home or light commercial use
  • Use for both cooling and heating at 9000 BTU/hour with 20.5 SEER (21.5 SEER2) and 10 HSPF (9 HSPF2) efficiency
  • Comes with every needed component in the box including an easy-install 16ft copper piping kit
  • Free tech support and a 5 year coverage on the parts and compressor

Smallest Mini Split AC Reviews 2022

 1. Pioneer WYS009AMFI17RL Mini Split Air Conditioner

Pioneer Air Conditioner WYS009A-20 Wall Mount...
  • Save money all year-round with a highly efficient ductless mini split inverter+ heat pump system
  • Ultra-silent and beautifully built: perfect for home or light commercial use
  • Use for both cooling and heating at 9000 BTU/hour with 20.5 SEER (21.5 SEER2) and 10 HSPF (9 HSPF2) efficiency
  • Comes with every needed component in the box including an easy-install 16ft copper piping kit
  • Free tech support and a 5 year coverage on the parts and compressor

If you need efficient climate control in your home, then the Pioneer WYS009AMFI19RL mini-split system is just right for you. With 9000 BTUs cooling power and 17 SEER efficiency, it’s ideal for spaces up to 400 square feet.

This air conditioner operates quietly regardless of the fan speed you use. On top of that, it features a “sleep function” for extra quiet as you sleep. 

It comes with a wireless remote control fitted with a large LCD backlit screen for easy operation even in the dark. Use the remote to change between the different available operation modes and adjust the temperature to your liking wherever you are in the room. 

The available operation modes are cooling, heat, dry(dehumidify), and auto, where the unit chooses a mode depending on the set specifics and the overall climate of your room.

This Pioneer WYS009AMFI19RL system’s packaging also includes a complete installation kit including a pair of insulated copper tubing, interconnecting signal wiring, wall sleeve liner & cap, putty, wrapping tape, and a drain line extension. S

o you don’t need to spend the extra bucks to get your unit to full function. Installation is easy, but you have to use a professional to avoid the risk of damaging the unit and voiding your warranty.


  • Operates quietly
  • 17/19 SEER energy efficiency
  • Remote-controlled for smooth operation.
  • 2-year limited warranty for parts and a 5-year limited warranty for the compressor.
  • It has washable air filters for easy maintenance.


  • No DIY Installations.

2. Senville SENL-09CD Mini Split Air Conditioner Heat Pump

Senville LETO Series Mini Split Air Conditioner...
  • ALEXA ENABLED MINI SPLIT AC/HEATING SYSTEM: Seamlessly integrate with voice control or app, allowing you to adjust your mini split air conditioner from anywhere. Set routines for optimal temperature changes, boasting energy savings up to 40%.
  • VERSATILE 4-IN-1 MINI SPLIT: Dive into an all-season solution with our mini split AC and heating system, featuring air conditioning, a robust heat pump (functional up to 5F/-15C), dehumidifier, fan, and an accelerated turbo function. Enjoy the reliability of a DC Inverter that's UL Listed, AHRI Certified, and Works with Alexa.
  • STYLISH & FUNCTIONAL MINI SPLIT AC: Crafted for both home and business, this mini split air conditioner provides dynamic performance without compromising on aesthetics. Ideal for bedrooms, living areas, commercial spaces like stores, eateries, and warehouses.
  • COMPLETE INSTALLATION PACKAGE: Comes with an indoor air handler, outdoor condenser, intuitive remote control, and a comprehensive installation kit featuring a 16ft. line set and communication wire. Pre-loaded with R410A refrigerant catering up to 25 ft. A heads-up: This system mandates professional installation – it's not a DIY mini split AC.
  • TRUST WORTHY 5-YEAR WARRANTY: Your investment is safeguarded with our mini split heat pump's industry-leading warranty – 5 years on parts replacement and another 5 on the compressor. Benefit from the established quality of Senville, complemented by complimentary technical assistance. Labor not included.

The Senville SENL-09CD is an excellent appliance addition to your home to serve your cooling and heating purposes. Packing a 9000 BTU cooling capacity and a temperature range between 62°-86°, this Senville unit is sure to keep your rooms comfortable throughout the seasons.

The unit is fitted with a variable inverter compressor to limit the amount of energy it uses. This feature, combined with the 19 SEER efficiency and 8.20 HSPF of the unit, will save you a lot on energy bills at the end of the day. 

Moreover, you can set the unit to “Eco mode” to run it at a standard 75°F to conserve even more energy. It also has washable and replaceable filters for easy maintenance and a turbo function to help you achieve the desired set temperatures fast.

The Senville 09CD also provides you with angled airflow for better even heating and cooling of your space. You just manually set the horizontal angle of the airflow on the indoor unit then use the remote to adjust the vertical flow as you please.


  • It has four operational modes – cooling, heating, dry, and auto mode.
  • Sleep function
  • The indoor unit has a multi-speed fan
  • Operates quietly
  • Comes with a 5-year limited warranty
  • The purchase includes an installation kit.


Installation requires a ¼” by ⅜” line set kit, which is not included during purchase.

3. Della 12000 BTU Mini Split Air Conditioner

DELLA 12000 BTU Mini Split Air Conditioner &...
  • [ENERGY EFFICIENT COOLING] This 12000 BTU/h, 17 SEER, 115V/60Hz, 9 HSPF, AHRI Certified pre-charged air conditioner and heater unit features a ductless mini split inverter plus system with a heat pump and dehumidification.
  • [AUTOMATIC SYSTEM] This air conditioner is designed with several smart settings that make it easy to use: auto defrost, self-diagnosis/cleaning, I feel mode, 24 hour timer, sleep mode, eco energy saving mode, multiple fan speeds and intelligent compressor pre-heating.
  • [SMART SENSOR & INSTALLATION] The unit will sense room temperature at the remote control, instead of at the indoor unit during cooling mode. It then adjusts airflow and temperature accordingly, resulting in the ultimate in personal comfort control and energy savings.Line-set vacuuming is required during installation. Any alteration of line-set length requires adjusting freon levels.This system mandates professional installation – it's not a DIY mini split AC.
  • [QUIET OPERATION] This air conditioner is ultra silent at only 30-41 dBa. The unit provides equal airflow in every part of your room and can adjust to 60-90 degrees Fahrenheit to suit your comforts in just a few minutes.

The Della 048-MS-12K1V-17S-1+0 mini split unit can cool or heat spaces between 450-750 square feet. It’s ideal for homes, offices, and light commercial places like cafes and retail stores. The unit is multi-functional, offering you cooling, heating, dehumidification, and ventilation operations all in one. 

It also has a smart remote control with a built-in proximity sensor to adjust the temperature and airflow depending on the distance between you and the indoor unit to give you absolute personal comfort at all times. The remote will sense the temperature at the remote then adjust the flow and temperature accordingly.

The Della 048-MS-12K1V-17S-1+0It also has inverter technology making it one of the most energy-efficient HVAC systems on the market. While conventional systems run at full capacity to regulate room temperature, the inverter technology in this Della unit uses just enough power to reach the preferred settings. It then lingers there until more energy is needed – the perfect way to give you consistent comfort and save energy.

Also, the unit has some automatic functions like auto defrost and self-cleaning, which makes maintenance a piece of cake.


  • Operates quietly
  • Has a pre-charged condenser
  • The unit is remote controlled
  • Performs four functions in one
  • Fitted with inverter technology for energy efficiency.
  • AHRI and ETL certified.


  • Parts from Della are hard to come by.
  • Poor customer service 

4. Klimaire 9,000 BTU KSIV Ductless Mini-Split 

Klimaire 9,000 BTU 21.5 SEER2 Ductless Mini-Split...
  • 𝐄𝐗𝐂𝐄𝐏𝐓𝐈𝐎𝐍𝐀𝐋 𝐄𝐅𝐅𝐈𝐂𝐈𝐄𝐍𝐂𝐘: The 9,000 BTU KSIV (115V) system offers an impressive energy rating of up to 21.5 SEER2, 9 HSPF2, and 12.5 EER2. Cooling Capacity Rating: 9,000 BTU | Heating Capacity Rating: 9,000 BTU. The system cools and heats an application area of up to 350 sq. ft.
  • 𝐏𝐄𝐑𝐅𝐎𝐑𝐌𝐀𝐍𝐂𝐄 𝐅𝐄𝐀𝐓𝐔𝐑𝐄𝐒: The KSIV Series offers standard features like cooling and heating for year-round comfort but is also equipped with special features such as low ambient heating and cooling down to 5°F, Self-cleaning option, dry mode for dehumidification, turbo operation, sleep mode, auto restart, and follow-me function to name a few. All features can be accessed using the remote control.
  • 𝐖𝐇𝐀𝐓’𝐒 𝐈𝐍𝐂𝐋𝐔𝐃𝐄𝐃: KSIV 9,000 BTU 115V Indoor Fan Coil, KSIV Smart DC Inverter Outdoor Condenser Pre-charged with 25’ of R410A Refrigerant, Wi-Fi KPIMDWF module, Remote Control, 16’Ft – 1/4 x 3/8 Maxwell Refrigerant Line Installation Kit with Interconnecting Wire Cables, Line Set Cover Kit, and Maxwell Wall Mounting Bracket.
  • 𝐖𝐀𝐑𝐑𝐀𝐍𝐓𝐘 𝐀𝐍𝐃 𝐂𝐎𝐍𝐕𝐄𝐍𝐈𝐄𝐍𝐂𝐄: 5 Years for Parts and 7 Years for Compressor Warranty. Durability and Longevity are guaranteed with a self-diagnostic feature, built-in base pan, and compressor heater for enhanced efficiency and reliability even in harsh environments, coupled with anti-corrosive golden fin technology for coastal applications.
  • 𝐒𝐘𝐒𝐓𝐄𝐌 𝐃𝐈𝐌𝐄𝐍𝐒𝐈𝐎𝐍𝐒 (𝐖𝐃𝐇): Indoor Unit KSIV009-H119-IW-2 (28.43 x 7.36 x 11.42 in) Outdoor Unit KSIV009-H119-O-2 (30.31 x 11.81 x 21.85 in).

Klimaire KSIV009-H119-S(W) mini-split air conditioner has a built-in KSIV inverter that optimizes the energy uses to cool your home. Coupled with the 9,000 BTU and 19 SEER, this ductless mini split ac will ensure your electricity bills stay low at the end of the month.

The auto-clean function keeps the evaporator clean and dry to keep away mildew and maintain fresh, healthy, and quality indoor air always. 

The outdoor unit has a built-in base pan heater that keeps the system fully functional even in temperatures as low as 5°F. It has a pre-charged compressor and has an automatic defrost function that prevents damage to the compressor at extremely low temperatures.

The Klimaire also includes a home-away freeze protection feature that maintains a 46°F temperature to keep your space warm enough whenever you are away for a long time. 


  • Purchase includes a 15ft installation kit
  • Follow me remote function
  • Has a programmable timer 
  • Auto-restart function to quickly restart and maintain your settings in case of a power outage.
  • Unlimited free tech support and a 5-year manufacturer warranty


  • It is costly to install

5. DAIKIN Wall-Mounted Ductless Mini-Split A/C Heat Pump 

No products found.

 The Daikin mini-split system with a heat pump is an excellent option for new or remodeled homes or rooms between 350-400 square feet. When set to eco mode, the unit’s compressor run at a slow speed, which in turn forces the motor to use less energy to heat or cool your room.

You can use the remote control to adjust temperature and switch between modes with ease especially when your unit is too far to operate manually

Daikin uses blue fin aluminium technology to protect the outdoor unit against corrosion and harsh climate, so you’re assured that the unit will last for a long time. The indoor unit also has a titanium deodorizing air filter that removes odors and keeps your home smelling fresh and clean always.


  • Fitted with variable inverter technology for energy efficiency
  • Has a built-in programmable thermostat
  • Comes with a 10-year warranty for parts
  • Operates quietly
  • Remote controlled


  • Getting hold of technical support is a problem sometimes.

6. Classic America Ductless Wall Mount Mini Split

The Classic America KFR-35GW/MA3B Mini-split AC is another multi-functional unit that heats, cools, dehumidifies, and circulates air using the fan mode. All these operating modes can be accessed using the remote.

Its outdoor unit has a Toshiba compressor that is pre-charged with R410A. So you won’t need extra services for adding the refrigerant. 

The indoor unit has an automatic air swing function that ensures even air circulation in your room. Together with the multi-speed fan in the unit, you get total control of your indoor climate and assured comfort in all corners of the room.

You can also set this ductless mini-split system to sleep mode. In sleep mode, the unit mirrors the room temperature, and your body temperature then adjusts the functions accordingly. 

There is also a temperature monitoring device (thermistor) fitted into the evaporator coil, which works well to maintain whatever temperature you choose for your space.


  • Has an active carbon filter for odor control
  • Auto restarts in case of power surges
  • 16ft installation kit included during purchase
  • Remote controlled
  • 1-year warranty
  • ETL approved
  • Operates quietly


  • Getting a hold of tech support is hard sometimes

7. Senville SENA-18HF/D Dual Zone Mini Split Air Conditioner

Senville SENA-18HF/D Dual Zone Mini Split Air...
  • PERFECT FOR MULTIPLE ROOMS: Comes with multiple indoor air handlers for individual rooms and a single outdoor unit. Enjoy individual temperature controls in each room for ideal climate control.
  • ALEXA ENABLED: Use voice or app control to control your air conditioner from anywhere. Use routines to adjust temperature settings while you are away and enjoy energy savings of up to 40%.
  • DESIGNED FOR HOME & BUSINESS: Powerful performance and dependable durability with high quality design for an attractive appearance. Great for bedrooms, additions, living rooms, and even commercial applications like stores, restaurants and warehouses.
  • 10 YEAR WARRANTY: Backed by an industry leading manufacturer’s warranty, with 5 years on parts replacement and 10 years on compressor. Trusted quality and design by Senville, with free technical & installation support included.
  • WHAT’S INCLUDED: Includes indoor air handlers, outdoor condenser and installation kit with 16ft. line set and communication wire. Important note: requires professional installation.

The Senville SENA-18HF/D Dual Zone Mini Split Air Conditioner defines ‘beauty with brains’ perfectly. This unit is stylish yet hosts excellent features and powerful performance. Packed with an 18000 BTU cooling capacity, this unit will comfortably control the climate in spaces between 600-1000 square feet. 

Moreover, it comes with multiple air handlers allowing you to custom-set temperatures for every room within your space. With this Senville unit, you don’t have to worry about any noise. Its whisper technology allows operations at minimum noise levels even at its maximum. You will barely notice that a mini-split A/C is in the room. 

This Senville unit will reduce your electricity bill considerably. Laden with a 22.5 SEER and DC inverter technology, you can look forward to excellent energy efficiency levels alongside powerful performance. It is also easy to install as it comes with simple instructions for installation. However, you may need some electrical knowledge for smooth installation. 

The 2-year warranty on parts and 7-year warranty on the compressor is the cherry on top of the cake. It’s among the best deals you will get for a small mini-split A/C unit. 

Is it all gold with this mini split A/C? Admittedly, it’s almost all gold with this Senville unit, except that it comes at a higher price point than other mini-splits A/Cs. It is also quite challenging to get repair parts with the Senville unit. 


  • Whisper-quiet operations
  • Has multiple air handlers
  • Easy to install as it comes with good instructions for installation
  • Lower power consumption
  • Two-year warranty on parts, seven-year warranty on compressor


  • Higher price point than other mini-split AC. 
  • It is hard to get repair parts.

8. Pioneer Air Conditioner CYB036GMFILCBD 8-Way Slim Cassette Mini-Split

PIONEER CYB036GMFILCBD Split Heat Pump, 36,000...
  • Mini split inverter ductless air conditioning and heating system, ultra quiet and superior efficiency
  • Complete system set consisting of; indoor Unit, air flow panel, outdoor Unit and installation kit
  • 36,000 BTU/h Cooling Capacity with 17.5 SEER High Efficiency Rating
  • 38,000 BTU/h Heating Capacity with 10.5 HSPF High Efficiency Rating
  • Voltage: 208~230 VAC, 60 Hertz, 1 Phase. For other specks see all pictures provided

If you are looking for a small yet ultra-powerful mini split ceiling casstte air conditioning system, then the Pioneer Air Conditioner CYB036GMFILCBD is worth a close look. This newest addition to the Pioneer AC family boasts a 36000 BTU cooling capacity perfect for climate control to spaces up to 2000 square feet. 

Its 15.0 SEER rating makes it worth it if you are looking to save on energy costs. Although this is not the most energy-efficient a mini-split A/C can get, the unit helps you achieve an outstanding balance between the price of the unit and the amount you save on utility costs.

You will also love that you can barely note the presence of this unit. It operates quietly, ensuring that nothing disturbs your peace. In addition, the unit comes complete with a remote control so that you can adjust the temperatures to your liking at the comfort of your bed or couch. 

We will all agree how installing a mini-split AC unit can be a nightmare. However, this unit comes with an easy installation kit complete with a 16-foot line set. You can easily follow the instructions on installation and have it operational in a few hours. 

However, if you feel hesitant, ensure that you call a professional. After all, you don’t want to lose such a valuable unit due to simple errors. 

You can’t have it all when it comes to your mini-split A/C. So there have to be some concessions, right? This unit is a bit more expensive than other mini splits A/Cs, but it’s all worth it, given its superior functionalities. 


  • Ultra-quiet operations
  • Energy efficient
  • It comes with an easy installation kit
  • Five-year warranty on parts, five-year warranty on compressor


  • The unit is more expensive than other mini splits A/Cs.

Mini Split Sizing

Installing a ductless mini-split doesn’t have to be complicated. The most challenging, yet the most crucial, aspect is sizing. Selecting the correct size for your unit is essential. A unit that is not sized correctly will not run efficiently, cost you more in energy bills, and eventually malfunction.

One very efficient HVAC system is the mini-split system, which uses inverter technology to generate the exact amount of cooling or heating your home needs to maintain a steady temperature. 

You must get the correct size unit, even if your system has inverter technology. This article discusses how to size your mini-split and what affects sizing. 


BTU, or British Thermal Unit, is what we use to measure thermal energy. More specifically, a BTU is how much heat is needed to increase the temperature of a pound of water by 1 degree Fahrenheit.

BTU ratings tell you how big or small of a room an HVAC system can heat. The bigger the room you need to heat or cool, the higher the BTU rating you need. Mini-split systems have a wide range of BTU ratings. You don’t want the BTU ratings on your system to be too large or too small. 

Why is Proper Ductless Mini-Split Sizing Crucial?

how to size the smallest mini split

If your ductless mini-split system is too large or too small for the room you need to cool or heat, it could affect the temperature of your home, your system could break, and it could raise your energy costs. 

Sizing a mini-split is also known as load calculation. This refers to determining how many BTUs your unit must have to keep the entire area constant, comfortable temperature.

While there are calculators on the internet you can use to determine which size unit to get, they are not always accurate. That’s because other factors affect which size you will need. 

What Happens with an Undersized Mini-Split?

If your mini-split is not big enough, it will not work efficiently, leading to an uncomfortably warm or uncomfortably cool home. 

An undersized mini-split unit will run continuously, raising the cost of your energy bill without adequate heating or cooling your home. The energy an undersized unit uses will be wasted because it must work harder, and it will create cold spots or hot spots in different sections.

A unit that works continuously will wear out quicker than a properly sized one and eventually break down. 

Can you Slightly Oversize a Mini Split?

An oversized mini-split is just as bad as an undersized one. If you use an undersized mini-split, you won’t save any money on energy.

Also, oversized mini-splits will short cycle. This refers to your unit turning off and on frequently. This short cycling leads to unnecessary wear, which may lead to your unit breaking down or malfunctioning.

A short-cycling oversized mini-split is also not effective at decreasing humidity, which makes it less effective at heating your home and makes the air feel damp even when the unit is cooling your home. 

How to Size your Mini-Split

To correctly size your mini split, consider how big the room or rooms your unit will be heating or cooling. If you don’t know how to size a mini split, get help from a professional.

Step one is to calculate each room’s square foot. Calculate the length and the width of the room, then multiply them together. Step two is to use a chart to determine the exact BTU rating based on square footage. You can also multiply your square footage by 25.

Ductless BTU Sizing Chart

Area Size BTU
150 to 300 sq. ft. 6,000
300 to 500 sq. ft. 9,000
400 to 650 sq. ft. 12,000
500 to 800 sq. ft. 15,000
600 to 1000 sq. ft. 18,000
800 to 1,300 sq. ft. 24,000
1,000 to 1,650 sq. ft. 30,000
1,200 to 2,000 sq. ft. 36,000
1,400 to 2,300 sq. ft. 42,000
1,600 to 2,650 sq. ft. 48,000
1,850 to 3,100 sq. ft. 56,000

Factors that Affect the Ductless Sizing

While square footage is the most determinate factor in choosing which size mini-split to install, other factors affect sizing as well. 

a woman controlling a small wall mounted air conditioner


How old your house affects which size ductless mini-split to choose. That’s because older homes don’t have as good of insulation as newer homes. Poor insulation means your unit has to work harder to heat or cool your home. 

Therefore, if you have an older house, increase your BTU calculation by 30% to combat the poor insulation.


If your home is in an extremely hot or cold climate, you should increase your BTU calculation by 30%. If you live in a climate with cold winters and hot summers, you don’t have to worry about increasing BTUs. This only refers to extreme climates.


It is obvious that high ceilings make rooms bigger, therefore you need more BTUs to heat or cool your home. If the space you want to heat or cool has high ceilings, increase your BTU rating by 20%.

Windows and doors

Windows and doors have cracks and gaps that let hot or cold air in. The more windows or doors your home has, the higher BTU rating you will need for your HVAC unit. 


Direct sunlight can heat a room quickly. This also applies to your home in general. Is your home surrounded by tall trees, or is it in the middle of a field? If your home is exposed to direct sunlight, you will need a higher BTU rating.

Also, if the room you are looking to cool gets a lot of direct sunlight through windows, your unit will have to work harder to combat this extra heat. Therefore, you will need a higher BTU rating. 

Number of people

Because people generate body heat, the number of people in your home affects how big you need your mini-split. Before you decide which size you need, keep in mind how many people live in your home. 

Floor type

The last thing that can affect which size mini-split you need is what the floor is made of. For example, a carpeted floor has more insulation than hardwood. 

The most important factor, and step number one, to determine what size mini-split you need is square footage. To calculate this, measure the length and width of the room you are looking to heat or cool and multiply them together. Multiply this number by 25 to determine how high of a BTU rating you need.

Each mini split unit can provide a max amount of BTUs, meaning it has a set heating and cooling power. If you want to heat or cool multiple rooms, you will need individual air handlers in each room, each with the right BTU rating for that room. You can take the total BTUs of each room to determine the total outdoor capacity you need.

Environmental factors also affect the BTU rating you need in your ductless mini-split unit. Things that negatively affect BTU ratings include poor insulation, high ceilings, lots of direct sunlight, many windows and doors, and a large number of people living in your home. Things that positively affect BTU ratings include tall, shady trees, a moderate climate, and good insulation.

You can Also Read: Ceiling Cassette vs Wall Mount Mini Split

Mini-Split vs. Window Air Conditioner vs. Portable Air conditioners

If you are AC hunting, you probably wonder whether to get a mini-split, a portable air conditioner, or a window air conditioner. To make your shopping seamless, I have provided the necessary information to help you determine the best ductless AC for your space

Portable Air Conditioner

Portable A/Cs have a duct at the back of the unit. It needs to be connected to a window to function fully. You will love this A/C’s small size, fair price, and portability. Better still, the units come fully assembled, so you don’t need to stress about assembly and installation.

However, on the downside, portable A/Cs have lower power. They can only effectively cool small spaces of about 20 square meters. You may also dislike their energy inefficiency and noisy nature. Moreover, you cannot use these systems all year long, as they are only restricted to air conditioning.


  • Portable
  • No installation is required as they come fully assembled
  • Relatively cheap


  • Lower power
  • Energy inefficient
  • Noisy
  • Restricted to air conditioning only

Window Air Conditioner

As its name suggests, the window A/C is mounted on windows or walls. Window A/Cs are cheaper, making them popular among buyers. They are also easy to install, eliminating a professional technician’s need and cost. However, you may need a little bit of assistance in lifting during installation, as window A/Cs are pretty bulky.

Notwithstanding these positive points, the progress made in the world of A/Cs makes window A/Cs outmoded. Those who enjoy natural lighting are out of luck, as you must position the units in a window.

They are also noisy, not to mention their high-energy consumption. The most unpleasant limitation is the security risk that window A/Cs pose to users. Perpetrators can easily remove it from its position and gain entry into your house.


  • Low initial cost
  • Easy installation without the need for professional help


  • Poor positioning reduces natural light and visibility in the house
  • Noisy
  • Poses a security risk
  • Less energy efficiency

Mini Split Air Conditioner

Mini-split air conditioners feature an outdoor compressor and an indoor air-handling unit, allowing you to control the temperatures within your space effectively. These units can cool multiple rooms, unlike the window and portable A/Cs.

Their high power and energy efficiency make them a highly coveted air conditioning system. If you appreciate quiet around your space, you will not go wrong with these A/Cs.

However, you may have to cough up quite a higher amount of money to purchase a mini-split AC. This will all be worth it once you reap the benefits. Its installation may also require additional costs for most units since technical expertise, although some will come with easy installation manuals.


  • Energy efficient
  • Quiet operations
  • Ability to cool multiple rooms
  • It can be used all year round (versatile)


  • Expensive
  • May need professional assistance for installation

Other Factors to Consider When Choosing a Mini Split System 

Before spending your hard-earned money to purchase a mini-split system, you need to consider a few factors. 


Mini-split systems usually work hard beneath the surface to control the room’s climate, and it is unrealistic to expect them to do so in complete silence. However, noise can drastically affect the comfort of your air-conditioned environment.

You, therefore, need to check the noise levels of the mini-split system on the product specification before making your purchase decision.

I recommend getting a quietest mini split system whose interior is no louder than 35dB and an exterior no louder than 5dB. If not stated in the product specifications, ensure you ask the dealer.

Energy Efficiency

Although most mini-split systems have responsive technology to allow energy efficiency, I recommend getting the most energy efficient mini split model. The Star-certified models can slash your cooling and heating costs by approximately 30% more than uncertified ones.

For a split system that heats and cools, ensure that it has both a SEER and HSPF rating. The higher the SEER and HSPF rating, the more efficiently your mini-split unit will run.


Mini-split systems can be single-zone or multi-zone, and you must decide which one would suit your needs. Zones refer to an indoor unit’s area intended to cool or heat. A single-zone system is cheaper and designed to cool one room as it has one outdoor and one indoor unit.

Dual-zone mini splits connect two indoor heads to a single generator allowing you to put the mini-split AC in two different rooms. A multi-zone system houses multiple indoor units powered by a single outdoor unit.

They can thus cool multiple rooms. If you need to cool multiple rooms or areas, you should get a multi-zone mini-split system.


Effective working of your mini-split system will depend on the flawless installation. You need to install the outdoor unit at a highly accessible place for maintenance needs. While doing this, ensure that it is out of the way, as it can get a little bit noisy.

You can install your mini-split system yourself as a DIY project, but if you are not sure, I recommend engaging the services of a licensed technician before purchase and installation.

Additional Features and Accessories

Did you know that your mini-split system would require more than just the indoor and outdoor units to function? Well, most people are unaware that they will need some additional accessories not included in the system package for the mini-split system to operate.

You may need to purchase them separately, or your HVAC technician can provide them. Additional features and accessories include; refrigeration line sets, condensate lines, drain pumps and ceiling cassette grills.

Smallest Mini Split FAQs

Do they make a 5000 BTU Mini Split?

No, manufacturers do not make a 5000 BTU mini-split. The available mini splits in the market start from 6000 BTU to 56000 BTU. If you need a 5000 BTU air conditioning system, you can opt for a portable or a window AC.

Do they make a 6000 BTU Mini Split?

Yes, manufacturers make a 6000 BTU mini-split. It is the lowest rating among the available mini-splits. It’s useful for smaller spaces between 150-300 square feet. These mini-split systems are not common, but the Mitsubishi 6000 BTU Ductless mini-split would be an excellent place to start if you are looking for one.

What is the smallest BTU mini-split?

The smallest BTU mini-split is 6000 BTU, a small system. Most of the mini-splits you will find are 9000 BTU, with the 12000 BTU being the most commonly used and available. Therefore, you might have some trouble finding a 6000 BTU mini-split, but you can check whether the Mitsubishi 6000 BTU Ductless mini-split is in stock.

What is the smallest DIY mini-split?

The smallest DIY mini split available is the MRCOOL DIY 12000 BTU. Amateurs with no previous HVAC experience can easily install this mini-split. It comes complete with all the installation equipment allowing you to save on additional installation costs. You will also not require any expensive tools to complete the installation.

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What is the smallest mini split cassette?

The smallest mini split cassette is about 14 by 16 inches. They are rectangular and were released by Mitsubishi in 2018. The new size deviates from the usual mini-split cassettes, whose smallest size was initially 22.5 by 22.5 inches and square. 

What is the smallest Daikin mini-split?

The smallest Daikin mini split features an indoor handler of 16″ ×16″ ×8″. This new model has quickly become a favorite for many consumers, as it is easy to install and store indoors.  

What is the smallest dual zone mini split?

The smallest dual zone mini split is the 6,000 BTU Wall Mounted Mitsubishi Mini-Split. This dual zone mini split can effectively control the climate in a 150-300 square feet room. The unique point of this dual zone mini split unit is the rarity of getting a 6,000 BTU mini-split. It’s also reasonably priced, considering Mitsubishi’s superior features and brand reputation.

What is the Smallest Mini Split System?

We hope that our smallest mini split air conditioner review has helped you pick the best mini split for your home.
Choosing the best ductless air conditioner for your home doesn’t have to be daunting at all. Senville SENL-09CD Mini Split Air Conditioner Heat Pump is our best overall, but you can always try other options