Finding the right built-in wall air conditioner can make a significant difference in maintaining comfortable indoor temperatures without sacrificing space. We’ve selected some of the best air conditioners designed for through-the-wall installation, covering a variety of room sizes and cooling capacities. This guide includes models with advanced features like remote controls, energy-efficient refrigerants, smart technology compatibility, and multi-functional modes.
Product | Cooling Capacity | Room Size Coverage | Key Features |
---|---|---|---|
LG 7,800 BTU Through the Wall AC | 7,800 BTU | Up to 330 sq. ft. | Energy-efficient R-32 refrigerant, 3 cooling speeds, remote control |
Frigidaire 12000 BTU Wall Air Conditioner | 12,000 BTU | Up to 550 sq. ft. | Multi-speed fan, air ionizer, washable filter, remote control |
TCL 14,000 BTU Smart Through-The-Wall AC | 14,000 BTU | Up to 700 sq. ft. | Heating, cooling, dehumidifier, works with Alexa/Google Assistant |
Frigidaire 12,000 BTU Through-the-Wall Room AC | 12,000 BTU | Up to 550 sq. ft. | Slide-out chassis, washable filter, remote, timer, sleep mode |
Keystone 18,800 BTU Window-Wall Air Conditioner | 18,800 BTU | Up to 1,000 sq. ft. | Cooling, supplemental heating, dehumidification, smart remote |
Content Navigation
- LG 7,800 BTU Through the Wall Air Conditioner
- Frigidaire 12000 BTU Cooling Built-In Room Wall Air Conditioner
- TCL H14T9XH 14,000 BTU Smart Through-The-Wall Air Conditioner
- Frigidaire Through-the-Wall Room Air Conditioner 12,000 BTU
- Keystone 18,800 BTU Window-Wall Air Conditioner with Heating
- Buying Guide for Built-In Wall Air Conditioners
LG 7,800 BTU Through the Wall Air Conditioner

This LG wall-mounted air conditioner is designed for smaller rooms up to 330 square feet. It uses the energy-efficient R-32 refrigerant with an energy efficiency ratio (EER) of 10.7, helping reduce electricity consumption. Its dimensions (24” W x 20.1” D x 14.4” H) allow easy through-the-wall installation, but it is not suitable for window mounting.
The unit offers 3 cooling speeds and pre-programmed modes including an energy saver mode to maintain airflow while conserving power. The turbo fan ensures confident and quick cooling. It also includes a remote control for convenient operation from across the room.
Frigidaire 12000 BTU Cooling Built-In Room Wall Air Conditioner

The Frigidaire 12000 BTU wall air conditioner is capable of cooling rooms up to 550 square feet. It features a multi-speed fan system with three different speed settings for precise climate control. One standout feature is its built-in air ionizer, which helps reduce airborne particles for cleaner, fresher air.
Additionally, this unit has an easy-to-clean washable dust filter that helps maintain performance and air quality. The remote control offers effortless adjustments, making it suitable for medium-sized rooms requiring dependable, built-in cooling.
TCL H14T9XH 14,000 BTU Smart Through-The-Wall Air Conditioner

This versatile TCL wall-mounted air conditioner provides 14,000 BTU cooling and a built-in heater delivering 8,600 BTU, suitable for rooms up to 700 square feet. It also functions as a dehumidifier and fan, providing all-season comfort. Its dry mode reduces humidity levels to improve air quality and prevent odors.
A notable feature is its compatibility with smart home assistants like Amazon Alexa and Google Assistant, enabling voice control and remote access. The unit is designed for through-the-wall installation, combining convenience with smart features.
Frigidaire Through-the-Wall Room Air Conditioner 12,000 BTU

This Frigidaire through-the-wall room air conditioner delivers 12,000 BTUs, efficiently cooling rooms up to 550 square feet. It comes with a convenient slide-out chassis for easy installation and maintenance, designed specifically for through-the-wall mounting rather than window use.
The washable mesh air filter captures dust to improve indoor air quality and keep the unit running efficiently. Additional features include a remote control, programmable timer, and sleep mode to optimize user comfort and energy use.
Keystone 18,800 BTU Window-Wall Air Conditioner with Heating

The Keystone 18,800 BTU window-wall AC unit is ideal for larger spaces up to 1,000 square feet, providing powerful cooling alongside a 16,000 BTU supplemental heating function. It includes dehumidification and fan circulation modes, enhancing year-round comfort.
The heating mode is supplemental and intended for moderate temperatures between 23°F and 76°F. The unit comes with a smart remote that monitors room temperature every 3 minutes to maintain precise control over the environment. Suitable for both window and through-the-wall installation setups.
Buying Guide for Built-In Wall Air Conditioners
When choosing a built-in wall air conditioner, several factors should be considered to ensure you select the best model for your space and needs:
Cooling Capacity and Room Size
Determine the size of the room you want to cool to select an air conditioner with the appropriate British Thermal Units (BTUs). Smaller rooms (under 350 sq. ft.) require units around 7,000-8,000 BTU, while larger rooms (up to 1,000 sq. ft.) need units with 18,000 BTU or more.
Installation Type
Wall-mounted air conditioners designed for through-the-wall installation differ from window units. Verify if the unit requires direct wall installation with proper venting, as not all window air conditioners are suitable for wall mounting.
Energy Efficiency
Look for units with high Energy Efficiency Ratios (EER) and features like energy-saving modes or inverter technology. Efficient models save on electricity bills while providing consistent cooling.
Additional Features
- Remote Control: Adds convenience for adjusting settings without needing to approach the unit.
- Heating Function: Some models provide supplemental heating, useful for year-round climate control.
- Air Quality Enhancements: Features such as air ionizers or washable filters help maintain cleaner indoor air.
- Smart Home Compatibility: Voice control and app connectivity allow remote operation and integration with home automation systems.
- Dehumidifier Mode: Useful in humid environments to reduce moisture and improve comfort.
Noise Level
Especially important for bedrooms or offices, check the noise rating to ensure the unit operates quietly enough for your requirements.
Maintenance
Opt for AC units with easy-to-remove and washable filters and accessible chassis designs to simplify cleaning and upkeep.