6 Best 12,000 BTU Through-the-Wall Air Conditioners with Heat of 2026
We compared six 12,000 BTU heat and cool wall units on heating output, room coverage, noise, sleeve fit and smart features.
By Daniel Brooks
Updated October 19, 2026
A 12,000 BTU through-the-wall air conditioner with heat is the most popular size for living rooms, large primary bedrooms and studio apartments of up to about 550 square feet. At this size, brands pair the cooling section with a heater that often rivals it, so one wall unit can handle summer heat and cool spring and fall days. Our list of the best 12,000 BTU through-the-wall air conditioners with heat compares six of them on heating output, room coverage, noise, sleeve fit and smart features. To browse every model we cover, visit our Through-the-Wall Air Conditioners with Heat page.
Every unit here is a true wall chassis with a heat mode, built for a 230 volt or 208/230 volt receptacle. They range from simple panel and remote models to fully smart units with app and voice control.
All Products Compared
| Product | Best For | Cooling | Heating | Noise | Notable Feature |
|---|---|---|---|---|---|
| TCL 12,000 BTU Smart Through-the-Wall Air Conditioner with Heater | Overall | 12,000 BTU | 11,600 BTU | 50 dB | App, Alexa, Google, Dry mode |
| OLMO 12,000 BTU 230V Through-the-Wall AC & Heater | Value | 12,000/11,700 BTU/h | 10,600/8,600 BTU/h | 58 dB | Built-in smart kit |
| ROVSUN 12000 BTU Through the Wall Air Conditioner with Heat | Top rating | 12000 BTU | 10600/8600 BTU | 57 dB | 4.3 average rating |
| Whirlpool 12,000 BTU Wall Air Conditioner with Heat | Universal sleeve fit | 12,000/11,600 BTU | 10600/8600 BTU | 57 dB | Fits 24.5 to 27 inch sleeves |
| Keystone 12,000 BTU Wall Mounted Air Conditioner with Heat | Follow me remote | 12,000 BTU | 10,600 BTU | 61.3 dB | Sealed system warranty |
| TABU 12,000 BTU Smart Through-the-Wall Air Conditioner with Heater | Newer smart option | 12,000 BTU | Heat mode | 51 dB | App, Alexa, Google |
| Award | Product | WikiCooling Score About WikiCooling ScoreThe WikiCooling Score is our own rating from 0 to 10, based on the criteria described on our How We Review page. It reflects research, not laboratory measurement, and is never influenced by manufacturers, retailers, or affiliate commissions. Learn more › | |
|---|---|---|---|
TCL 12,000 BTU Smart Through-the-Wall Air
|
7.6/10 | Buy | |
| Best Budget |
OLMO 12,000 BTU 230V Through-the-Wall AC & Heater
|
8.1/10 | Buy |
| Best Value |
ROVSUN 12000 BTU Through the Wall Air Conditioner
|
8.3/10 | Buy |
| Best Premium |
Whirlpool 12,000 BTU Wall Air Conditioner
|
7.8/10 | Buy |
Keystone 12,000 BTU Wall Mounted Air Conditioner
|
6.2/10 | Buy | |
| Best Overall |
TABU 12,000 BTU Smart Through-the-Wall Air
|
9.4/10 | Buy |
TCL 12,000 BTU Smart Through-the-Wall Air
Take control over your home comfort. The TCL 12,000 BTU Smart Through-the-Wall Air Conditioner is equipped with a 11,600 BTU heater so you can set and maintain your ideal temperature in spaces up to 550 sq. ft. And with its included remote and the TCL Home mobile app, you can adjust its settings without having to get up from the comfort of your couch. You can also pair it with Alexa or Google Assistant-enabled devices to control it with simple voice commands. This wall unit helps keep your energy bill low with Sleep and Eco modes that prioritize energy efficiency, and it includes several fan speeds (low, medium, high, and auto in cool mode) along with 4-way ventilation and multidirectional louvers to ensure even and consistent cooling across your space. Its washable and reusable filter helps protect the life of your AC while also reducing large airborne particles like dust and pet hair. The unit comes with guided instructions so you don’t have to be an expert technician to set up your through-the-wall AC. Once set up, the LED display makes controlling your wall AC simple. It’s time to enjoy your home the way it was meant to be. Sleeve not included. Compatible sleeve dimensions: 26”x20”x15.57.
OLMO 12,000 BTU 230V Through-the-Wall AC & Heater
Product description The Olmo TTW Through the Wall Unit Olmo’s “Through The Wall” air conditioning unit is a versatile and efficient cooling solution designed to seamlessly integrate into your living space. This unit combines convenience, efficiency, and comfort, all in one sleek package. Some of its great features include a remote control that allows you to change settings, adjust temperature, and switch modes from the comfort of your couch or bed. Whether you’re upgrading your home or office, Olmo has you covered, making this unit an excellent choice for any room. Olmo takes convenience to the next level with “Smart Connect” letting you control the unit remotely using your smartphone. The exclusive remote controller features include Sleep Mode, Timer, Auto Restart and a Self evaporating system. Olmo’s TTW Sleeve is available to purchase separately for easy installation. From the brand OLMO offers a range of air conditioning and heating solutions, such as ducted and ductless mini splits, Multi-positional Air Handlers, and Through The Wall systems. Known for affordability and quality, OLMO integrates cutting-edge technology to deliver reliable, energy-efficient, and user-friendly products. Our commitment to innovation ensures high SEER2 ratings, minimal noise, and effective performance, making OLMO a smart choice for any space. Through-The-Wall A/C Single Zones Multi Zones
ROVSUN 12000 BTU Through the Wall Air Conditioner
This 230V through-the-wall air conditioner delivers 12,000 BTU of cooling and up to 10,600 BTU of heating for rooms up to 550 square feet. It offers multiple modes including dehumidification and a 24-hour timer, with easy-clean filters and a remote control. Ideal for bedrooms, apartments, and small offices seeking year-round climate control.
Pros
- Cools and heats spaces up to 550 sq ft
- Multiple operating modes including dehumidification
- Easy-clean washable filter
- Remote control included
- Energy-saving ECO mode
Cons
- Noisy on medium and high fan settings
- Requires 230V outlet, not standard 115V
- Wall sleeve sold separately
Whirlpool 12,000 BTU Wall Air Conditioner
This Whirlpool through-the-wall air conditioner delivers 12,000/11,600 BTU of cooling for rooms up to 550 square feet, plus supplemental heat for chilly evenings. It fits standard wall sleeves and includes a remote, programmable timer, and Eco mode. Best suited for homeowners seeking a permanent cooling solution with basic heating capability.
Pros
- Powerful cooling for large rooms
- Supplemental heat for mild cold
- Fits standard wall sleeves
- Remote control included
- Easy-clean washable filter
Cons
- Requires 230V/15A outlet
- SEER 9.6 is below modern standards
- Heavy at 72.3 pounds
Keystone 12,000 BTU Wall Mounted Air Conditioner
This Keystone wall-mounted air conditioner delivers 12,000 BTU of cooling for rooms up to 550 square feet, along with supplemental heating and dehumidification. Its space-saving design frees up floor and window space, and the remote control with built-in thermostat helps maintain your desired temperature. It's a suitable option for small to medium bedrooms or living rooms where a permanent wall installation is preferred.
Pros
- Cools rooms up to 550 sq ft
- Supplemental heat for cooler days
- Dehumidifier removes 2.5 pints per hour
- Remote control with thermostat
- Space-saving wall mount design
Cons
- Requires 230V/20A electrical outlet
- SEER 9.5 efficiency rating is low
- Heating mode supplemental only (not primary heat)
TABU 12,000 BTU Smart Through-the-Wall Air
Product description Product Introduction
Top 3 12,000 BTU Through-the-Wall Air Conditioners with Heat Reviewed
#1 TCL 12,000 BTU Smart Through-the-Wall Air Conditioner with Heater: Best Overall
Why We Picked It
The TCL H12T9XH has the strongest heater and the lowest listed sound level of the main 12,000 BTU heat units. Its 11,600 BTU heater nearly matches the 12,000 BTU cooling section, so it can properly warm a living room on a cool day, and TCL lists just 50 dB. It is rated for spaces up to 550 square feet and has a 3.9 average from 22 ratings.
It is also the most polished smart unit in this size. The TCL Home app, Alexa and Google Assistant handle remote and voice control, and Dry, Sleep and Eco modes add flexibility. In cool mode, you get low, medium, high and auto fan speeds, plus 4-way ventilation and multidirectional louvers. It runs on 230 volts with a rated draw of 1160 watts in cooling and uses R-32 refrigerant.
Key Specifications
- Cooling Capacity: 12,000 BTU
- Heating Capacity: 11,600 BTU
- Room Size: Up to 550 sq ft
- Power: 230 volts, 1160 watts
- Noise Level: 50 dB
- Weight: 73.2 pounds
| Pros | Cons |
|---|---|
|
|
Things to Consider
TCL lists a compatible sleeve of 26 by 20 by 15.57 inches. Measure your existing sleeve before ordering, since some brands use slightly narrower ones.
Best For
This unit is best for living rooms and large bedrooms where you want strong heat, quiet cooling and smart control.
Check the current price and availability of the TCL 12,000 BTU Smart Through-the-Wall Air Conditioner with Heater on Amazon.
Read our full TCL 12,000 BTU Smart Through-the-Wall Air Conditioner with Heater review.
#2 OLMO 12,000 BTU 230V Through-the-Wall AC & Heater: Best Value
Why We Picked It
The OLMO OW-P12HS230WF gives you most of what the TCL offers for less. It is rated at 12,000/11,700 BTU/h of cooling and 10,600/8,600 BTU/h of heating at 230 and 208 volts, and it includes a built-in smart kit for app and voice control. It also has a 4.2 average from 13 ratings, one of the better scores in this size.
You can run it from the push button panel with its LED display, the included remote, your phone or a voice assistant. Sleep mode, a timer, auto restart and a self evaporating system cover everyday needs, and it uses R-32 refrigerant. OLMO lists 58 dB, which is a little louder than the TCL but fine for a living room.
Key Specifications
- Cooling Capacity: 12,000/11,700 BTU/h
- Heating Capacity: 10,600/8,600 BTU/h
- Power: 208/230V, 60Hz
- Noise Level: 58 dB
- Smart Control: App and voice
- Weight: 85.8 pounds
| Pros | Cons |
|---|---|
|
|
Things to Consider
OLMO does not publish a room size, so use the ENERGY STAR chart: 12,000 BTU suits rooms of about 450 to 550 square feet. The sleeve is sold separately in this listing.
Best For
This unit is best for buyers who want smart heat and cool control at a lower price than the TCL.
Check the current price and availability of the OLMO 12,000 BTU 230V Through-the-Wall AC & Heater on Amazon.
Read our full OLMO 12,000 BTU 230V Through-the-Wall AC & Heater review.
#3 ROVSUN 12000 BTU Through the Wall Air Conditioner with Heat: Best Rated
Why We Picked It
The ROVSUN 12000 BTU has the highest average among the established 12,000 BTU heat units, 4.3 from 22 ratings shared across its series. It pairs 12000 BTU of cooling with a 10600/8600 BTU heater for spaces up to 550 square feet, and lists a moderate 57 dB.
It keeps the controls simple: an LED panel and remote, four modes (Cool, Heat, Fan and Dry), 3 fan speeds, a 24 hour timer and an ECO setting. The thermostat runs from 61 to 88 degrees F, and the washable filter comes out of the front panel without tools. It fits standard 25.5 inch wall sleeves and includes a trim kit and rear grille. The rated draw is 1160 watts in cooling.
Key Specifications
- Cooling Capacity: 12000 BTU
- Heating Capacity: 10600/8600 BTU
- Room Size: Up to 550 sq ft
- Power: 230V, 1160 watts
- Noise Level: 57 dB
- Weight: 72 pounds
| Pros | Cons |
|---|---|
|
|
Things to Consider
This version has no app control. Check that your sleeve is the standard 25.5 inch size.
Best For
This unit is best for buyers who want a proven, simple heat and cool unit for a medium to large room.
Check the current price and availability of the ROVSUN 12000 BTU Through the Wall Air Conditioner with Heat on Amazon.
Read our full ROVSUN 12000 BTU Through the Wall Air Conditioner with Heat review.
Other Models Worth Considering
Whirlpool 12,000 BTU Wall Air Conditioner with Heat (WHAT122-HAW). The best choice when the sleeve brand is unknown, because it fits sleeves from 24.5 to 27 inches wide. It offers 10600/8600 BTU of supplemental heat for spaces up to 550 square feet, up to 1.6 pints per hour of dehumidifying, 8-way louvers and a 24 hour timer. It needs a 230V/15A outlet, lists 57 dB and has a 4.0 average from 10 ratings.
Keystone 12,000 BTU Wall Mounted Air Conditioner with Heat (KSTAT12-2HD). A 230 volt unit with a 10,600 BTU supplemental heater for rooms up to 550 square feet and a remote that reads the temperature where you sit. Keystone adds 4 years of sealed system coverage. It lists 61.3 dB, the loudest here, and its 2.8 average from 16 ratings is the weakest in this guide.
TABU 12,000 BTU Smart Through-the-Wall Air Conditioner with Heater. A newer smart unit for rooms up to 550 square feet with Cool, Heat, Dry and Fan modes, app control and Alexa and Google Assistant support. TABU lists 51 dB and a rated 1140 watts. It has only 2 ratings so far, and the listing does not give a heating figure.
What to Expect from 12,000 BTU Through-the-Wall Air Conditioners with Heat
A 12,000 BTU heat and cool wall unit is sized for the main room of a home or apartment. On a 230 volt supply, these units list heaters of roughly 10,600 to 11,600 BTU, enough to warm that room well on cool days. On a 208 volt supply, both cooling and heating output drop somewhat. Most brands describe the heat as supplemental, so it works best alongside a central system in cold regions.
For other sizes and features, see our guides to smart through-the-wall air conditioners with heat and 230V through-the-wall air conditioners with heat. The product cards show the current price for each unit.
How to Choose a 12,000 BTU Through-the-Wall Air Conditioner with Heat
Size the Unit to the Room
ENERGY STAR publishes this general guide for sizing a room air conditioner by floor area:
| Room Size (sq ft) | Cooling Capacity (BTU/hr) |
|---|---|
| 100 to 150 | 5,000 |
| 150 to 250 | 6,000 |
| 250 to 300 | 7,000 |
| 300 to 350 | 8,000 |
| 350 to 400 | 9,000 |
| 400 to 450 | 10,000 |
| 450 to 550 | 12,000 |
| 550 to 700 | 14,000 |
| 700 to 1,000 | 18,000 |
Reduce capacity by 10 percent for a heavily shaded room, increase it by 10 percent for a very sunny room, add 600 BTU for each regular occupant beyond two, and add 4,000 BTU if the unit cools a kitchen. Source: ENERGY STAR.
Compare the Heaters
TCL lists 11,600 BTU of heat, and OLMO, ROVSUN, Whirlpool and Keystone list 10,600 BTU on a full 230 volt supply. That is a small gap, so noise, controls and sleeve fit usually decide between them.
Listen for Noise
For a bedroom, compare listed sound levels. The TCL lists 50 dB and the TABU 51 dB, while the Keystone lists 61.3 dB. The ROVSUN and Whirlpool sit in the middle at 57 dB.
Match the Sleeve
Whirlpool fits 24.5 to 27 inch sleeves, ROVSUN fits a 25.5 inch sleeve, OLMO and Keystone use a chassis about 24 inches wide, and TCL specifies 26 by 20 by 15.57 inches. Measure before you order.
How We Evaluate 12,000 BTU Through-the-Wall Air Conditioners with Heat
We rank heat and cool wall units on manufacturer specifications, listing details and aggregated buyer ratings. For this list we kept only through-the-wall chassis with a heat mode and a 12,000 BTU cooling rating, and excluded cooling-only units, window units and duplicate listings of the same model. We weighed heating output, room coverage and buyer feedback first, giving more weight to ratings from larger numbers of buyers, then compared noise, sleeve fit, smart features and warranty.
Frequently Asked Questions
Which 12,000 BTU wall unit has the strongest heater?
The TCL 12,000 BTU unit, with an 11,600 BTU heater.
Which one is the quietest?
The TCL lists 50 dB, followed by the TABU at 51 dB.
Which ones have Wi-Fi?
The TCL, OLMO and TABU units offer app and voice control.
Which one fits the most sleeve sizes?
The Whirlpool 12,000 BTU unit fits sleeves from 24.5 to 27 inches wide.
Final Verdict
The TCL 12,000 BTU Smart Through-the-Wall Air Conditioner with Heater is the best 12,000 BTU through-the-wall air conditioner with heat for most homes, with the strongest heater, a 50 dB listing and full smart control. For smart features at a lower price, choose the OLMO 12,000 BTU 230V Through-the-Wall AC & Heater. For the best average rating with simple controls, the ROVSUN 12000 BTU Through the Wall Air Conditioner with Heat is the pick.
About the author
Daniel Brooks is a home cooling editor at WikiCooling, covering window, portable, through-the-wall and mini-split air conditioners, fans, and dehumidifiers. He researches cooling capacity, energy efficiency, noise levels, installation requirements, and buyer feedback to help homeowners choose the right unit for their room size, climate, and budget.