Which MRCOOL Mini Split Air Conditioner Fits Your Room?
As Amazon Associates, we earn from qualifying purchases. This means we may receive a small commission at no extra cost to you if you click through and make a purchase.
Many people search for a “Mr Cool air conditioner,” but the brand writes its name as MRCOOL. The company is known for ductless mini splits, and especially for DIY versions a handy homeowner can install. A ductless mini split has a slim indoor unit on the wall and a compact outdoor unit outside, joined by a small bundle of pipes and wires through a hole in the wall. Every model here is also a heat pump, which means it can move heat out of your room in summer and pull heat in during cooler months.
These five models differ mostly in cooling power, measured in BTU: 9,000 for a bedroom, 12,000 for a medium room, 18,000 for a large living area and 24,000 for open-plan spaces, with a 4th Gen DIY 12,000 BTU unit that adds smart features and low-temperature cooling.
MRCOOL Mini Split Air Conditioners Compared
| Model | BTU | Room size | Voltage | Noise |
|---|---|---|---|---|
| MRCOOL 12000 BTU Ductless Inverter | 12,000 | Up to 550 sq ft | 115V | 43 dB |
| MRCOOL 9000 BTU Ductless Inverter | 9,000 | Up to 400 sq ft | 115V | 43 dB |
| MRCOOL 18000 BTU Ductless Inverter | 18,000 | Up to 750 sq ft | Not listed | 60 dB |
| MRCOOL 24000 BTU 230V Advantage | 24,000 | Up to 1,000 sq ft | 230V | 56 dB |
| MRCOOL 12,000 BTU WiFi Smart DIY 4th Gen | 12,000 | Not listed | 115 | 23.5 dB |
MRCOOL 12000 BTU Ductless Inverter Mini for Medium Rooms
MrCool Comfort Made Simple
MRCOOL 12000 BTU Ductless Inverter Mini Split Air Conditioner & Heat Pump
Price and specifications are read from the Amazon product page and can change.
MRCOOL 12000 BTU Ductless Inverter Mini
Best for: Mid-size rooms up to 550 sq ft
Pros
- 12,000 BTU
- 115V power
- Quiet 43 dB listed
- DIY installation claimed
Cons
- Line set details not listed
- No smart features named
The MRCOOL 12000 BTU Ductless Inverter Mini split heats and cools areas up to 550 square feet. “Inverter” means the compressor, the part that pumps refrigerant, changes speed smoothly instead of switching fully on and off, which generally keeps temperatures steadier and uses less power. It runs on 115V power, draws 586 watts according to the listing, and uses R-454B refrigerant.
The listing names easy DIY installation and fast cooling, and gives a noise level of 43 dB, on the quieter side for a mini split. It does not say how long the line set is, whether it is pre-charged, or whether the unit has WiFi. The item dimensions of 18 by 45 by 21 inches likely describe the packaging or outdoor unit rather than the wall unit.
This fits a living room, large bedroom or small apartment on household voltage. If you want app control and alerts at the same size, the 4th Gen WiFi Smart DIY model lists more features. For a smaller space, the 9,000 BTU model is the step down.
MRCOOL 9000 BTU Ductless Inverter Mini for Bedrooms
Best for: Bedrooms and small offices
Pros
- 9,000 BTU for up to 400 sq ft
- 115V power
- 43 dB listed
Cons
- Lowest SEER listed at 14
- Refrigerant not specified
The MRCOOL 9000 BTU Ductless Inverter Mini split covers up to 400 square feet, which suits a bedroom, nursery or home office. Like its 12,000 BTU sibling, it runs on 115V, has an inverter, offers heating and cooling, and lists a 43 dB noise level.
The listing gives a SEER of 14. SEER stands for Seasonal Energy Efficiency Ratio, a measure of how much cooling you get per unit of electricity over a season, so a higher number means lower running costs. At 14 it is the lowest SEER listed here. The refrigerant type is not specified, and the install claim matches the 12,000 BTU model: streamlined DIY installation, with no line set details.
Choose this for a single small room where a bigger unit would switch on and off too often. For rooms above 400 square feet, move up to 12,000 BTU.
MRCOOL 18000 BTU Ductless Inverter Mini for Large Living Areas
Best for: Large living areas up to 750 sq ft
Pros
- 18,000 BTU
- Alexa and Google compatible
- Washable filter
- Follow Me function
Cons
- Loudest at 60 dB
- Voltage not listed
The MRCOOL 18000 BTU Ductless Inverter Mini split handles up to 750 square feet. It adds smart features: built-in Smart HVAC technology compatible with Google Assistant and Amazon Alexa, WiFi compatibility and a Follow Me function, which uses a sensor in the remote so the unit cools based on where you are sitting.
It has a washable filter, copper core material, R-454B refrigerant and an inverter compressor. The listing mentions DIY easy installation, but it does not specify the voltage, which matters at this size because larger mini splits often need a 230V circuit. Confirm the power needs before you order. At 60 dB, it is the loudest listed here.
This suits a large family room, basement or small open-plan apartment, especially for someone who likes voice control. For areas beyond 750 square feet, the 24,000 BTU Advantage takes over.
MRCOOL 24000 BTU 230V Ductless Inverter for Open-Plan Spaces
Mrcool Comfort Made Simple
MRCOOL 24000 BTU 230V Ductless Inverter Mini Split Air Conditioner & Heat Pump System, Advantage Series – Wall-Mounted AC Unit w/Heating and Cooling for Home, Office & Commercial Space
Price and specifications are read from the Amazon product page and can change.
MRCOOL 24000 BTU 230V Ductless Inverter
Best for: Open-plan spaces with a hired installer
Pros
- 24,000 BTU up to 1,000 sq ft
- WiFi and remote
- Washable filter
Cons
- Professional installation required
- Needs 230V circuit
The MRCOOL 24000 BTU 230V Ductless Inverter is from the Advantage Series and heats or cools up to 1,000 square feet. The listing says plainly that installation should be done by an HVAC technician, so this is not a DIY kit. It runs on 230V.
It includes WiFi, a remote, a washable filter and R-454B refrigerant, with an inverter and a 56 dB noise level. The core material is listed as aluminium alloy. The listing also includes a “window opening minimum height” of 76 centimeters, which does not apply to a wall-mounted mini split and appears to be a data error.
This is the pick for an open kitchen and living area, a shop or a small commercial space when you are happy to pay for professional installation. For DIY at a smaller size, look at the 12,000 BTU WiFi Smart DIY.
MRCOOL 12,000 BTU WiFi Smart DIY for Hands-On Owners
Mrcool Comfort Made Simple
MRCOOL 12,000 BTU WiFi Smart DIY Star 4th Generation Ductless Remote Controlled Mini Split Air Conditioner with Sleep Mode Function, White
Price and specifications are read from the Amazon product page and can change.
MRCOOL 12,000 BTU WiFi Smart DIY
Best for: DIYers wanting smart features on 115V
Pros
- Pre-charged Quick Connect line set
- Cools down to 5 degrees F
- Low refrigerant alarm
- Auto restart after outages
Cons
- Older 4th generation
- Refrigerant not specified
The MRCOOL 12,000 BTU WiFi Smart DIY is a 4th Generation DIY mini split, the model many people mean when they search “MRCOOL DIY 4th Gen.” It includes pre-charged Quick Connect line sets, so no special tools, equipment or training are needed, and the listing says installation takes a few hours. The box contains the outdoor heat pump condenser, indoor air handler, an upgraded DIYPro cable, remote, Smart HVAC WiFi kit and an installation kit.
Extra features include a low refrigerant alarm, filter cleaning and replacement alerts, sleep mode, auto restart at previous settings after a power outage, and low ambient cooling down to 5 degrees Fahrenheit for server rooms or greenhouses. It is rated at 1 ton (12,000 BTU), SEER 22, 115 volts and 23.5 dB. The listing does not state room coverage or refrigerant type.
This suits first-time DIYers who want an all-in-one box and smart alerts. It is an older generation than the other models here, so if newer refrigerant matters to you, check the label. For a larger space, the 18,000 BTU unit covers more.
How to Choose the Right MRCOOL Air Conditioner
Size by the room. These listings map BTU to space: 9,000 for up to 400 square feet, 12,000 for up to 550, 18,000 for up to 750 and 24,000 for up to 1,000. An oversized unit cools too fast and leaves a room clammy, while an undersized one runs constantly.
Decide who installs it. The 4th Gen WiFi Smart DIY clearly includes pre-charged Quick Connect line sets. The 9,000, 12,000 and 18,000 BTU inverter listings claim DIY-friendly installation but give fewer details. The 24,000 BTU Advantage requires a technician.
Check your electrical supply. The 9,000, 12,000 and 4th Gen models list 115V. The 24,000 BTU needs 230V, and the 18,000 BTU listing does not say. If you cannot add a circuit, a portable air conditioner is an easier stopgap.
Think about features and noise. The 4th Gen DIY has the lowest listed noise and the most alerts, while the 18,000 BTU adds voice assistant support. If you are comparing other 12,000 BTU heat pumps, our guide to a 12000 BTU unit with heat offers another point of reference.
FAQ
Is it Mr Cool or MRCOOL?
The brand writes its name as MRCOOL, all one word. Both spellings bring up the same products in search.
Do MRCOOL mini splits heat as well as cool?
Yes. All five listings describe heating and cooling capabilities, because they are heat pumps.
Can I install a MRCOOL mini split myself?
The 4th Gen WiFi Smart DIY is designed for DIY with pre-charged Quick Connect line sets. The 9,000, 12,000 and 18,000 BTU inverter listings also mention DIY installation. The 24,000 BTU Advantage requires an HVAC technician.
What BTU do I need for a bedroom?
For a typical bedroom up to 400 square feet, the 9,000 BTU model matches the listing guidance. Sunny rooms or high ceilings may need 12,000 BTU.
Which MRCOOL is the quietest?
The 4th Gen WiFi Smart DIY lists 23.5 dB. The 9,000 and 12,000 BTU inverter models list 43 dB.
Which MRCOOL should I buy?
For a DIYer cooling one medium room, the 12,000 BTU WiFi Smart DIY. For a bedroom, the 9,000 BTU. For an open-plan home with a pro installer, the 24,000 BTU Advantage.
