Finding the best air conditioner for windows that open sideways can be tricky because most traditional window AC units are designed for vertical sliding windows. Luckily, there are several options specifically suited for horizontal or sideways window openings that provide efficient cooling and easy installation. Below is a summary of some top-rated air conditioners and related products tailored to sideways window setups, including portable and uniquely designed window units that ensure comfort without compromising your window design or view.
| Product | Brand | Cooling Capacity | Best For |
|---|---|---|---|
| Electactic U-Shaped Air Conditioner Window Unit | Electactic | 10,000 BTU | Rooms up to 450 sq. ft., full window view |
| AEROZY Windowless Portable Air Conditioner | AEROZY | Portable Cooler (no BTU rating) | Rooms without windows or sideways-opening windows |
| GE 6,000 BTU Window Air Conditioner | GE | 6,000 BTU | Small rooms up to 250 sq. ft. |
| Frigidaire 5,000 BTU Window Air Conditioner | Frigidaire | 5,000 BTU | Small rooms up to 250 sq. ft. |
| HOOMEE Window Seal for Portable AC | HOOMEE | N/A | Improves portable AC efficiency in sideways windows |
Electactic U-Shaped Window Air Conditioner 10,000 BTU
The Electactic U-Shaped Air Conditioner is designed explicitly for sideways or sliding windows, featuring a unique U-shaped design that places the compressor outside the window, allowing uninterrupted window views and letting natural light in. Its 10,000 BTU cooling capacity efficiently cools spaces up to 450 square feet such as living rooms, large bedrooms, or offices.
It includes six operation modes: Cool, Dry, Fan, Auto, Sleep, and Energy Saver, plus three fan speeds and four-way airflow adjustment for tailored comfort. The compressor’s external positioning results in a quiet operation rated at 45 dB—ideal for maintaining a peaceful environment.
This unit’s energy-saving features and adaptable cooling and dehumidifying functions make it well-suited for various weather conditions and room sizes while preserving the aesthetics and function of a sideways window.
AEROZY Windowless Portable Air Conditioner 3-Speed, 4 Modes
The AEROZY Portable Air Conditioner is ideal for users with windows that open sideways, or no windows at all. This compact evaporative cooler doesn’t require a window or exhaust hose, making it highly versatile for rooms, offices, or dorms where traditional window units cannot be installed.
It offers three-speed settings and four specialized modes—Cool, Sleep, Eco, and Natural—to suit different cooling needs. The inclusion of a 7-hour timer, remote control, and four ice packs enhances user convenience and cooling efficiency. The unit is quiet, portable, and simple to operate.
This unit is more of an air cooler than a traditional AC, relying on evaporative technology, so it works best in dry climates or well-ventilated areas.
GE 6,000 BTU Window Air Conditioner for Small Rooms
The GE 6,000 BTU electronic window air conditioner is crafted for efficient cooling in smaller sideways-opening rooms up to 250 square feet, such as bedrooms or home offices. It comes with an easy-install kit designed to accommodate sideways window types.
This unit features adjustable fan and cooling settings for controlled comfort, while its low-noise operation allows for disturbance-free use during nighttime. The simple installation process and compact size make it a practical choice for small households needing sideways window AC solutions.
Frigidaire 5,000 BTU Window-Mounted Air Conditioner
The Frigidaire 5,000 BTU window air conditioner is suitable for small spaces up to 250 sq. ft., featuring quiet operation at 52 dBA, making it an excellent option for bedrooms or offices with sideways opening windows.
It provides customizable temperature settings and two fan speeds, controlled effortlessly to maintain your desired comfort level. The washable filter simplifies maintenance and promotes lasting performance. Its straightforward installation fits many window types with minor adjustments, thus accommodating sideways window openings.
HOOMEE Universal Window Seal for Portable AC and Dryer
The HOOMEE Universal Window Seal improves cooling efficiency when using portable air conditioners on sideways or non-standard windows. It seals the open window space around the exhaust hose, blocking warm air from re-entering the room and preventing external elements like rain or insects from entering.
By creating a closed and insulated environment, it helps reduce energy consumption and enhances the performance of portable AC units. The product is easy to install with zip and adhesive fasteners and is particularly useful when modifying sideways window openings to accommodate portable cooling devices.
Buying Guide: Choosing Air Conditioners for Sideways Opening Windows
When selecting an air conditioner designed for windows that open sideways, consider these critical factors to ensure optimal cooling, ease of installation, and energy efficiency:
1. Compatibility with Sideways Windows
Most traditional window AC units are built for vertical sliding windows. Look for specially designed U-shaped or compact units that fit horizontal sash windows or consider portable models with window sealing accessories to maintain efficiency.
2. Cooling Capacity (BTU)
Match the BTU rating to your room size for effective cooling. Small bedrooms or offices typically require 5,000–6,000 BTUs, while larger living spaces may need 10,000 BTUs or more. Overpowered units waste energy; undersized units will struggle to cool.
3. Noise Level
Check decibel (dB) ratings if noise is a concern, especially for bedrooms or offices. Units with noise levels below 52 dB are considered quiet for home use. Unique designs that position compressors outside the window often reduce noise significantly.
4. Installation Ease and Window Seal Compatibility
Installation methods differ depending on unit type. Sideways window ACs or portable units need effective sealing solutions like window kits or seals (e.g., HOOMEE) to prevent warm air infiltration and increase cooling efficiency.
5. Additional Features
- Multiple modes: Look for cool, dry, fan, and energy saver modes for year-round comfort.
- Air filters: Washable or reusable filters improve air quality and reduce maintenance.
- Remote control & timers: Enhance convenience and energy management.
- Energy efficiency ratings: Choose Energy Star rated units or those with high CEER values to save on electricity.
6. Portability and Multi-Use Options
If permanent installation isn’t desirable or possible, portable air conditioners with sealing kits are practical. Some models double as evaporative coolers, which may be better suited for dry climates. Consider your space constraints and usage pattern before deciding.