6 Best Through-the-Wall Air Conditioners with Heat of 2026
We compared six through-the-wall air conditioners with heat on cooling capacity, heating output, room size, power needs, noise and controls.
By Daniel Brooks
Updated October 19, 2026
A through-the-wall air conditioner with heat gives one room cooling in summer and electric warmth in spring and fall, from a single unit that stays in the wall all year. It slides into a sleeve in an exterior wall, vents out the back, and adds a heating element that uses the same fan and louvers as the air conditioner. Our list of the best through-the-wall air conditioners with heat compares six of them on cooling capacity, heating output, room size, power needs, noise and controls. To browse every model we cover, visit our Through-the-Wall Air Conditioners with Heat page.
Every pick here is a true wall chassis with a real heat mode, not a window unit or a cooling-only wall model. The list covers 115 volt units with light heat for bedrooms and offices, and 230 volt units with much stronger heaters for living rooms and apartments.
All Products Compared
| Product | Best For | Cooling | Heating | Power | Noise |
|---|---|---|---|---|---|
| LG LT1237HNR 11,200 BTU Through the Wall Air Conditioner with Heat | Overall | 11,200 BTU | Supplemental heat | 230/208V | 55 dB |
| TCL 12,000 BTU Smart Through-the-Wall Air Conditioner with Heater | Smart control | 12,000 BTU | 11,600 BTU | 230V | 50 dB |
| OLMO 8,000 BTU Through-the-Wall AC and Heater | Standard outlet | 8,000 BTU/h | 4200 BTU/h | 115V | 52 dB |
| Whirlpool 10,000 BTU Wall Air Conditioner with Heat | Replacing an old unit | 10,000/9,800 BTU | 10600/8600 BTU | 230V/20A | 57 dB |
| Keystone 10,000 BTU Wall Mounted AC with Heat | Follow me remote | 10,000 BTU | 10,600 BTU | 230V/20A | 58 dB |
| ROVSUN Smart 8,000 BTU Through the Wall Air Conditioner with Heat | Smart on 115V | 8000 BTU | 4200 BTU | 115V | 61 dB |
| 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 › | |
|---|---|---|---|
| Best Premium |
LG LT1237HNR 11,200 BTU Through the Wall Air
|
7.3/10 | Buy |
| Best Value |
TCL 12,000 BTU Smart Through-the-Wall Air
|
7.6/10 | Buy |
| Best Overall |
OLMO 8,000 BTU Through-the-Wall AC & Heater
|
8.1/10 | Buy |
Whirlpool 10,000 BTU Wall Air Conditioner
|
Buy | ||
Keystone 10,000 BTU Wall Mounted AC with Heat
|
7.0/10 | Buy | |
| Best Budget |
ROVSUN Smart 8,000 BTU Through the Wall Air
|
7.8/10 | Buy |
LG LT1237HNR 11,200 BTU Through the Wall Air
Experience optimal cooling and heating with our versatile 11,800 BTU Through the wall Air Conditioner unit. Designed for medium-sized rooms up to 520 sq. ft., this unit offers two cooling/heating and fan speeds, allowing you to customize your comfort according to your needs. The 4-way air deflection feature empowers you to direct the airflow precisely, whether you are cooling, heating, dehumidifying, or simply circulating the air. Take advantage of the convenient 24-hour on/off timer and energy-saving option to reduce energy costs while maintaining a comfortable environment. In the event of a power outage, the auto restart feature ensures that your unit will automatically resume operation once power is restored, saving you from the hassle of manual adjustment. Our wall air conditioner comes with a user-friendly remote control, providing effortless control from anywhere in the room. The trim kit adds a touch of elegance to the installation, achieving a seamless and sophisticated finish. The removable and washable filter ensures clean and fresh airflow, while the check filter alert reminds you when it's time to clean or replace the filter for optimal performance. Please note that the wall sleeve required for installation is sold separately.
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 8,000 BTU 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
Whirlpool 10,000 BTU Wall Air Conditioner
Whirlpool's line of home comfort products keeps the climate inside your home just right. The through-the-wall air conditioners are compatible with standard wall sleeves and offer a permanent cooling solution for areas of your home that are not connected to a central cooling system, saving you the hassle of summer installation then winter storage. This 10,000/9800 BTU model quickly cools a room up to 450 square feet with up to 1.2 pints per hour dehumidification. It also features 10600/8600 BTUs of supplemental heating to take the chill out of early Fall nights but is not meant as a primary heat source in the coldest months. Equipped with a programmable 24-hour, you can customize the start and stop times to fit your schedule. Plus, three cooling speeds, Eco function, and Sleep function all give you the flexibility you need to keep you comfortable. Eco Mode conserves energy by turning off the compressor when your desired room temperature is reached. On-board electronic controls are supplemented by a convenient remote control so you can customize your cool from anywhere in the room. This unit requires a special 230-volt/20-amp electrical outlet and will not operate with a standard 115V household electrical outlet.
Keystone 10,000 BTU Wall Mounted AC with Heat
This through-the-wall unit delivers 10,000 BTU of cooling and 10,600 BTU of supplemental heat for rooms up to 450 sq ft, with a built-in dehumidifier that removes 2.3 pints per hour. It requires a 230V/20A outlet and a separate wall sleeve (not included), making installation more involved than a window unit. Suitable for small to medium spaces where a permanent solution is desired.
Pros
- Cools and heats for year-round comfort
- Built-in dehumidifier improves air quality
- Smart remote with LCD and 3-minute updates
- Energy Saver and Sleep modes cut costs
- Washable filter with maintenance alert
Cons
- Requires 230V outlet and separate wall sleeve
- Noise level of 58 dB
- Supplemental heat not for primary heating
ROVSUN Smart 8,000 BTU Through the Wall Air
This through-the-wall unit from ROVSUN delivers 8,000 BTU of cooling and 4,200 BTU of heating for rooms up to 350 square feet. It includes WiFi and voice control, a remote, and multiple operating modes. A good fit for anyone needing a combined AC and heater in a standard wall sleeve.
Pros
- Heats and cools for year-round use
- Smart controls with app and voice
- Fits standard 25.5-inch wall sleeve
- Washable filter for easy maintenance
Cons
- No inverter compressor
- Heavy at 62.8 lbs
- Wall sleeve not included
Top 3 Through-the-Wall Air Conditioners with Heat Reviewed
#1 LG LT1237HNR 11,200 BTU Through the Wall Air Conditioner with Heat: Best Overall
Why We Picked It
The LG LT1237HNR has the longest track record of any heat model we cover, with a 3.7 average from 75 ratings. LG rates it at 11,200 BTU for rooms up to 550 square feet, which covers a medium living room, a large bedroom or the main room of an apartment. Its supplemental electric heat uses the same 60 to 86 degree F thermostat range as cooling, so switching seasons is as simple as changing the mode.
It is also one of the quieter heat units at a listed 55 dB. Two cooling, heating and fan speeds, 4-way air deflection, a 24 hour timer, auto restart, a filter reminder and a remote cover everyday use. The 24 inch chassis matches LG’s other wall units, so it is a natural replacement for an older LG heat and cool model, and the box includes a trim kit and mesh filter.
Key Specifications
- Cooling Capacity: 11,200 BTU
- Room Size: Up to 550 sq ft
- Heat: Supplemental electric heat
- Power: 230/208V, NEMA 6-20 plug
- Noise Level: 55 dB
- Weight: 82 pounds
| Pros | Cons |
|---|---|
|
|
Things to Consider
Parts of the product description mention 11,800 BTU and 520 square feet, while LG’s title and specifications list 11,200 BTU and 550 square feet. Size your room against the specification figures. The sleeve is sold separately.
Best For
This unit is best for apartments and homes that already have a 230 volt sleeve outlet and want a proven, relatively quiet all-season wall unit.
Check the current price and availability of the LG LT1237HNR 11,200 BTU Through the Wall Air Conditioner with Heat on Amazon.
Read our full LG LT1237HNR 11,200 BTU Through the Wall Air Conditioner with Heat review.
#2 TCL 12,000 BTU Smart Through-the-Wall Air Conditioner with Heater: Best Smart Pick
Why We Picked It
The TCL H12T9XH pairs 12,000 BTU of cooling with an 11,600 BTU heater, nearly matching its cooling output, so it can do real heating work on cool days rather than just take the edge off. TCL rates it for spaces up to 550 square feet, and it runs on a 230 volt circuit with a rated draw of 1160 watts in cooling.
It is the smartest and one of the quietest units in this guide. The TCL Home app, Alexa and Google Assistant let you change modes and temperatures from anywhere, and TCL lists just 50 dB. Dry, Sleep and Eco modes, low, medium, high and auto fan speeds in cool mode, 4-way ventilation, a washable filter and R-32 refrigerant round out the feature list. It has a 3.9 average from 22 ratings.
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
- Smart Control: TCL Home app, Alexa, Google Assistant
| 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 smart home users who want strong heat and quiet cooling in a living room or large bedroom.
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.
#3 OLMO 8,000 BTU Through-the-Wall AC & Heater: Best on a Standard Outlet
Why We Picked It
The OLMO OW-P08HS115WF is the pick for rooms where the sleeve has only a regular outlet. It delivers 8,000 BTU/h of cooling and 4200 BTU/h of heating on 115 volt power, so you can add heat without hiring an electrician. It also has the best average in this guide, 4.2 from 12 ratings, and one of the most affordable price tags among heat models.
OLMO builds in a smart kit, so you can use the push button panel with its LED display, the remote, the phone app or voice control. It lists 52 dB, uses R-32 refrigerant, and adds sleep mode, a timer and auto restart. The 4200 BTU/h heater is modest, but that is normal for a 115 volt heat unit, and it is plenty to take the chill off a bedroom or office on a cool morning.
Key Specifications
- Cooling Capacity: 8,000 BTU/h
- Heating Capacity: 4200 BTU/h
- Power: 115V, 1 phase, 60Hz
- Noise Level: 52 dB
- Smart Control: App and voice
- Weight: 77 pounds
| Pros | Cons |
|---|---|
|
|
Things to Consider
This is a small room unit. If the room is large or runs cold for much of the year, a 230 volt model with a bigger heater is the better choice.
Best For
This unit is best for bedrooms, home offices and studios with a standard outlet at the sleeve.
Check the current price and availability of the OLMO 8,000 BTU Through-the-Wall AC and Heater on Amazon.
Read our full OLMO 8,000 BTU Through-the-Wall AC & Heater review.
Other Models Worth Considering
Whirlpool 10,000 BTU Wall Air Conditioner with Heat (WHAT102-HAW). The easiest replacement unit here, because it fits sleeves from 24.5 to 27 inches wide. It delivers 10,000/9,800 BTU of cooling and 10600/8600 BTU of supplemental heat for spaces up to 450 square feet, with 8-way louvers, Eco and Sleep functions and a 24 hour timer. It needs a 230V/20A outlet and lists 57 dB.
Keystone 10,000 BTU Wall Mounted AC with Heat (KSTAT10-2HD). A 230 volt unit with a 10,600 BTU heater for rooms up to 450 square feet. Its remote reads the temperature where you sit, so the unit heats or cools to your spot rather than the wall. Keystone adds 4 years of sealed system coverage on top of 1 year parts and labor. It lists 58 dB and has a 3.5 average from 24 ratings.
ROVSUN Smart 8,000 BTU Through the Wall Air Conditioner with Heat. A smart 115 volt alternative to the OLMO, with 8000 BTU of cooling, a 4200 BTU heater, five modes including Auto and Dry, and Alexa and Google Assistant control. It is rated for up to 350 square feet and fits a 25.5 inch sleeve. ROVSUN lists 61 dB on high, and its 4.0 average from 48 ratings is shared with the larger sizes.
What to Expect from Through-the-Wall Air Conditioners with Heat
A heat and cool wall unit is a permanent, all-season appliance. It stays in the sleeve year round, frees up your windows, and handles both summer cooling and shoulder-season warmth. The heat comes from an electric resistance element, which is simple and reliable but costs more per hour than a gas furnace. Most brands describe it as supplemental heat, designed to take the chill out of a room rather than to replace a central system through a cold winter.
For specific needs, see our guides to 115V through-the-wall air conditioners with heat and smart through-the-wall air conditioners with heat. The product cards show the current price for each unit.
How to Choose a 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.
Look at Heating Output, Not Just Cooling
The heater size varies far more than the cooling size. The 115 volt units in this guide list about 4200 BTU of heat, enough for a small room on a cool morning. The 230 volt units list roughly 10,600 to 11,600 BTU, which can warm a medium room properly. If heat matters as much as cooling, the voltage of your outlet largely decides how much you can get.
Check the Outlet
Look at the receptacle beside the sleeve before you choose a model. The OLMO 8,000 BTU and ROVSUN smart units plug into a standard outlet. The LG, TCL, Whirlpool and Keystone need a 230 volt receptacle, and LG specifies a NEMA 6-20 plug. Never use an adapter.
Match the Sleeve
Most units here use a chassis about 24 inches wide. Whirlpool states a fit range of 24.5 to 27 inches, ROVSUN fits a 25.5 inch sleeve, and TCL specifies 26 by 20 by 15.57 inches. Measure the inside of your existing sleeve, and replace it if it is rusted or bent.
How We Evaluate 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 excluded cooling-only wall units, window units and bare sleeves. We weighed cooling capacity, heating output and room size against power requirements and buyer feedback first, giving more weight to ratings from larger numbers of buyers, then compared noise, sleeve fit, controls and warranty. Where a listing gives conflicting figures, we note both and use the specification figure.
Frequently Asked Questions
Can a through-the-wall air conditioner with heat replace a furnace?
Usually not in a cold climate. Brands such as Whirlpool describe the heat as supplemental and not meant as a primary heat source in the coldest months.
Which one has the strongest heater?
The TCL 12,000 BTU unit, with an 11,600 BTU heater.
Which ones run on a standard outlet?
The OLMO 8,000 BTU and the ROVSUN Smart 8,000 BTU run on 115 volt power.
Which one is the quietest?
The TCL 12,000 BTU unit lists 50 dB, followed by the OLMO 8,000 BTU at 52 dB.
Final Verdict
The LG LT1237HNR 11,200 BTU Through the Wall Air Conditioner with Heat is the best through-the-wall air conditioner with heat for most homes with a 230 volt outlet, thanks to its long track record, 550 square foot rating and 55 dB listing. For app and voice control with a strong heater, choose the TCL 12,000 BTU Smart Through-the-Wall Air Conditioner with Heater. If your sleeve has only a standard outlet, the OLMO 8,000 BTU Through-the-Wall AC and Heater 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.