Looking for an energy efficient through-the-wall air conditioner? This guide highlights five top options that balance cooling power with efficiency, ideal for bedrooms, living rooms, and apartments. Each pick is best for specific room sizes and use cases, helping you choose based on features like supplemental heat, dehumidification, and smart controls. The selections focus on quiet operation, flexible airflow, and durable installation. Use the buyer notes below to compare which unit fits your needs, from compact rooms to larger living areas.
Overview of top picks at a glance:
- LG 10,000 BTU Through the Wall AC — best for mid-size rooms up to 440 sq ft; strong energy efficiency using R-32 refrigerant.
- Keystone 8,000 BTU Wall AC — great for small to medium spaces up to 350 sq ft; includes supplemental heat and dehumidification.
- Whirlpool 14,000 BTU Through-the-Wall — ideal for large spaces up to 700 sq ft with versatile modes.
- Whirlpool 10,000 BTU Through the Wall — solid mid-size option up to 450 sq ft with modular installation.
- Frigidaire 12,000–14,000 BTU Series — options for larger rooms up to 550–700 sq ft with smart features.
LG 10,000 BTU Through the Wall Air Conditioner
Best for medium rooms up to 440 sq ft, this LG unit emphasizes energy efficiency with R-32 refrigerant and an EER of 10.7. It supports three cooling speeds and three pre-programmed modes, including a Turbo option for rapid cooling. An Energy Saver mode circulates air without running the compressor, helping reduce power use over time. The Dry mode extracts up to 2.9 pints of moisture per hour, improving comfort in humid spaces. Four-way air deflection gives flexible airflow direction.
Who it’s best for: renters or homeowners with medium-sized living spaces who value lower energy costs and straightforward operation. Why selected: high EER with efficient refrigerant, solid all-around cooling features, and a compact installation profile designed for through-the-wall setup. Caution: installation requires proper through-the-wall venting and may not be suitable for standard window installation.
Keystone 8,000 BTU Wall Mounted Air Conditioner
Best for small to medium rooms up to 350 sq ft, this Keystone unit combines cooling with supplemental heating and dehumidification. It’s designed for space-saving installation with an interior trim kit to preserve the view and floor space. The included dehumidifier function helps reduce humidity, which can improve comfort in damp environments. The supplemental heating is useful for shoulder seasons, though it is not intended as a primary heat source in very cold weather.
Who it’s best for: compact living areas or studio apartments that need year-round comfort without taking up window space. Why selected: versatile year-round capability with efficient cooling and added heating. Caution: heating is supplemental and should not replace primary heat during cold months.
Whirlpool 14,000 BTU Through-the-Wall Air Conditioner
Best for large spaces up to 700 sq ft, this Whirlpool unit provides robust cooling with 10600/8600 BTU supplemental heat, though the heat is not meant as a primary heat source in very cold months. It offers 8-way directional louvers, three fan speeds, and four operation modes for customization. The sleeve fit and included trim kit help achieve a clean, built-in look. The 230V/20A outlet requirement makes it suitable for larger rooms with higher electrical capacity.
Who it’s best for: homeowners or apartments with bigger living rooms or open-plan layouts needing substantial cooling. Why selected: high cooling capacity plus flexible airflow and trim-kit finish for a polished installation. Caution: the supplemental heat is not primary heating and depends on suitable outdoor temperatures.
Whirlpool 10,000 BTU Through the Wall Air Conditioner
Best for mid-size spaces up to 450 sq ft, this Whirlpool model balances energy efficiency with flexible airflow. It features an attached 5.9-ft LCDI plug for 115V circuits and offers eight-way louvers, three fan speeds, and four operation modes. The universal fit sleeve dimensions (about 24.5–27 inches wide) along with a trim kit support straightforward installation and a clean look in a living room or bedroom. It’s a dependable choice when you need solid cooling with easy control from the included remote.
Who it’s best for: households in need of a reliable, mid-range option with good airflow control for medium rooms. Why selected: consistent performance, compatible sleeve sizing, and practical remote control for convenient operation. Caution: ensure your wall cavity and electrical setup meet the 115V requirements and sleeve width specs.
Frigidaire 12,000 BTU Through the Wall AC With Dehumidifier
Best for larger rooms up to 550 sq ft, this Frigidaire option emphasizes energy efficiency and air quality with a built-in ionizer to reduce airborne particles. It includes a remote for convenient control and offers three speeds across cooling and fan modes. This model targets spaces where improved air quality and distributed airflow matter, making it a practical choice for busy living spaces or home offices. The 12,000 BTU rating provides strong cooling potential for bigger rooms.
Who it’s best for: larger rooms or spaces where air quality matters, such as home offices or family rooms. Why selected: strong cooling capacity with enhanced air purification features and remote operation. Caution: higher BTU may be more than needed for smaller rooms, leading to faster cycling in well-insulated spaces.
Buying Guide: Key Considerations For Through-The-Wall A/C Units
- Room size and BTU: Match BTU ratings to the room size. Oversized units cool quickly but may cycle on/off more, reducing efficiency. Undersized units struggle to reach set temperatures.
- Energy efficiency: Look for units with high EER or SEER, energy saver modes, and refrigerants with lower environmental impact (e.g., R-32).
- Installation and sleeve: Ensure your wall sleeve size aligns with the unit’s dimensions. A proper sleeve and trim kit help a clean, efficient installation.
- Heating and dehumidification: Supplemental heating or dehumidifier modes add year-round comfort. Verify limitations and intended usage for heating in shoulder seasons.
- Airflow and features: 4-way or 8-way louvers, multiple speeds, and remote control improve comfort. Some models include ionizers or air purifiers for better indoor air quality.
- Electrical requirements: Check voltage and outlet compatibility (115V vs 230V). Larger rooms may need higher-capacity circuits.
- Maintenance: Removable, washable filters simplify upkeep. A filter reminder light helps maintain efficiency.
- Noise levels: For bedrooms and study areas, lower decibel ratings support better sleep and concentration.
Frequently Asked Questions
What size through-the-wall AC should I choose for my room?
Choose BTU based on room size. Typical ranges: up to 350 sq ft (8,000–12,000 BTU), 350–550 sq ft (12,000–14,000 BTU), and 550–700 sq ft (14,000 BTU or more).
Are energy efficient refrigerants worth it?
Yes. Refrigerants like R-32 improve cooling efficiency and reduce environmental impact, contributing to lower operating costs.
Can I install a through-the-wall unit myself?
Installation often requires a proper wall sleeve, sealant, and electrical connections. Follow manufacturer instructions and consider professional help if unsure.
Do these units provide heat?
Some models include supplemental heating, but most are primary cooling devices. Check the specific unit’s heating capacity and intended use.
Will a through-the-wall unit fit in a standard sleeve?
Most units specify sleeve dimensions. Verify sleeve width, depth, and wall thickness before purchase.
What maintenance helps sustain efficiency?
Regularly clean or replace filters, ensure proper airflow, and keep the area around the unit unobstructed.