Portable Air Conditioning for a Room: The Benefits
Portable A/C units for homes cool individual rooms. They take in room air, cool it and send the air back into the room, venting warm air outside through an exhaust hose in a window. Controls on the units allow you to adjust settings such as fan speed and temperature.
Small Room Air Conditioners: Alternative or Extra Cooling
These small room air conditioners give you a simple alternative to window air conditioners and central air conditioners. They’re relatively easy to install and can be a good option for rooms with no existing cooling system or rooms you don't need to cool all the time. A portable A/C unit for a home can also supplement larger systems and help cool apartments or rentals where you're unable to install a permanent unit.
Room A/C Units: Portable Cooling Where and When You Need It
Easy setup and the portability of a compact design and wheels allow you to move this type of small room air conditioner from one room to another and reinstall it with minimal effort.
Portable A/C Units for Homes: Compatibility
Room A/C units portable enough to move from room to room must be compatible with your windows. Units fit different window sizes and those designed for single or double hung and sliding windows won't work with casement windows, which open by swinging outward.
Choosing the Best Portable Room Air Conditioner
While in general the best portable air conditioner is one that cools quickly and is easily portable, there are other things to consider when looking for the best portable air conditioner unit for your home or a specific room. The best choice depends on your needs.
Portable A/C Sizing
Whether you want to cool your kitchen, home office, guest bedroom or any other room in the house, choosing the best portable A/C for the size of the room is essential for comfort, energy efficiency and overall performance. A properly sized portable air conditioner cools a room effectively while helping maintain balanced humidity levels.
An undersized unit may struggle to reach the desired temperature and run continuously, increasing energy costs and wear on the system. On the other hand, a unit that's too large may cool the room too quickly without removing enough moisture from the air, leaving the space feeling damp or clammy. To find the right portable air conditioner for your space, first determine the room's square footage by multiplying its length by its width. Then compare that measurement to the unit's British Thermal Unit (BTU) rating, which indicates how much heat the air conditioner can remove from a room each hour.
In general, higher BTU ratings provide greater cooling power and are better suited for larger rooms, while lower BTU ratings work well in smaller spaces. Factors such as high ceilings, direct sunlight, room occupancy and heat-producing appliances may also affect the cooling capacity you need. Compare your room size to the BTU rating to help select a portable air conditioner that delivers efficient, reliable cooling:
- The best portable room air conditioners for 250- to 299-square-foot rooms have BTU ratings from 4,000 to 6,500.
- The best portable room air conditioners for 300- to 500-square-foot rooms have BTU ratings from 5,000 to 8,000.
- The best portable room air conditioners for 501- to 700-square-foot rooms have BTU ratings from 8,000 to 12,000.
Keep in mind that as the BTU rating increases, the size and weight of the A/C unit increases, as well as the energy consumption.
Portable Small Room Air Conditioners and Efficiency
The best portable room air conditioners have high energy efficiency ratios. The energy efficiency ratio (EER) indicates the efficiency of an A/C unit. The higher the EER rating, the more efficient the A/C.
Room A/C Units: Portable Air Conditioner Features
The best portable air conditioner has features that make the device more versatile and convenient. You can find air conditioners with multiple functions in addition to cooling. A dehumidifier mode removes moisture from the air without cooling. A fan function simply circulates air in the room. Some portable air conditioners have a heating capability, allowing you to keep the temperature comfortable year-round. Make sure you configure the unit for each mode. For example, cooling mode requires warm air exhaust, while the dehumidifier function requires access to a drain to remove the moisture the unit collects. If your portable air conditioner has a heater function, the heating unit will have a separate BTU rating, meaning the room size it fits may be different.
There are other features available:
- As an air conditioner cools the air in a room, it also removes moisture, and water collects in the unit. Self-evaporating air conditioners reduce the need to drain this water.
- A programmable timer can be set to turn the unit on and off at specific times, so you reduce energy consumption by operating the air conditioner only when needed.
- A remote control adds convenience. You can adjust settings and turn the air conditioner on and off from across the room.
- A lamp-off feature can turn off the panel display lights so they don't make the room uncomfortably bright at night.
Window Venting for Portable Air Conditioners
Portable air conditioners must be vented to the outside to remove the heat they collect from a room. Most portable A/Cs include an exhaust hose and adjustable window vent kit that can be installed in standard vertical or horizontal sliding windows. Proper venting is essential for efficient cooling, as venting the hot air indoors can reduce performance and increase energy use. When selecting a portable air conditioner, make sure the exhaust hose can comfortably reach a window without excessive bends or extensions, which can restrict airflow. If you have specialty windows, such as casement or crank-out windows, additional venting accessories may be required. Always follow the manufacturer's installation instructions to ensure safe operation and optimal cooling performance.
Single-Hose vs. Dual-Hose Portable Air Conditioners
When shopping for a portable air conditioner, you'll typically choose between a single-hose or dual-hose model. Single-hose portable air conditioners use one hose to expel hot air outside after pulling air from the room to cool the space. These models are generally more affordable and work well in smaller spaces such as bedrooms, home offices and apartments. Dual-hose portable air conditioners use one hose to draw fresh air from outside and a second hose to exhaust hot air. Because they don't rely solely on conditioned indoor air for cooling, dual-hose models can cool larger rooms more quickly and efficiently, especially in hot climates or frequently used living spaces. While dual-hose units often cost more, they may provide better performance and improved energy efficiency in larger areas. Consider your room size, cooling needs and budget when deciding which type of portable air conditioner is right for your home.
Portable Air Conditioner Setup and Maintenance
Select a location near a window and an available power outlet. Note that the manufacturer may specify that you plug the device directly into the outlet with no extension cord. Setup is relatively quick and easy and should require just a screwdriver to complete. Install the unit's adjustable window panel and connect the exhaust hose. Allow the unit to stand upright for at least an hour, and it will be ready to operate.
Portable air conditioners require simple maintenance. Disconnect the unit from power before you begin.
- Drain the water from the unit as needed. Depending on conditions, even self-evaporating units may need draining.
- Clean the air filter every two weeks or as directed by the manufacturer.
- Regularly wipe the air conditioner down with a damp cloth to remove dust. Wipe up excess moisture with a dry cloth.
Portable A/C vs. Window A/C: Which Is Best for You?
Portable air conditioners and window air conditioners are both effective solutions for cooling individual rooms without installing central air conditioning. While both types remove heat and humidity from the air, they differ in installation, portability, appearance and overall performance. Understanding these differences can help you choose the right option for your home.
Benefits of a Portable Air Conditioner
Portable air conditioners are designed for flexibility and convenience. These freestanding units sit on the floor and use an exhaust hose to vent hot air through a nearby window. In general, a portable A/C:
- Is easy to install with minimal tools or permanent modifications.
- Can be moved from room to room as cooling needs change.
- Is ideal for renters, apartments and homes with homeowners assocation restrictions that limit window-mounted units.
- Is a practical solution for cooling spaces such as home offices, guest bedrooms, garages or finished basements.
- Works well in rooms with windows that may not support a traditional window air conditioner.
Choose a portable air conditioner if you need temporary, supplemental or movable cooling for different areas of your home.
Benefits of a Window Air Conditioner
Window air conditioners are installed directly into a window opening and remain in place throughout the cooling season. Because most of the unit sits outside the home, they can provide efficient cooling while taking up less indoor space. A window A/C:
- Doesn't occupy valuable floor space.
- Provides a more permanent, built-in appearance.
- Typically offers more cooling power for the size and price of the unit.
- Often operates more quietly indoors because much of the unit remains outside the room.
- Is a good choice for bedrooms, living rooms, apartments and other spaces that need consistent cooling throughout the season.
Choose a window air conditioner if you want a dedicated cooling solution for a specific room and don't plan to move the unit between spaces.
Pricing and efficiency vary widely among both portable and window air conditioners, so always look at units with similar cooling power when comparing one type to another.
Renter Considerations
Portable air conditioners are often a popular choice for renters because they require minimal installation and don't permanently alter the property. Most models can be set up using a temporary window vent kit and standard electrical outlet, making them easy to install and remove when it's time to move. Before purchasing a portable, review your lease agreement and check with your landlord or property manager for any restrictions on window-mounted units. Some apartment communities, condominiums and homeowners associations (HOAs) may prohibit or limit window air conditioners due to appearance or safety concerns. If window units aren't allowed, a portable air conditioner can provide an effective way to cool bedrooms, home offices and living areas while remaining compliant with rental property requirements.
Portable Air Coolers
Unlike an air conditioner, which uses a chemical coolant to cool the internal air, an air cooler, also known as evaporative cooler, uses a fan and water pump to cool down the existing air. Air coolers add humidity to the air instead of removing it. One of the best places to put an air cooler is in front of an open window so that it pulls in the hot, humid air and blows out cool air. For better ventilation and to allow for a steady flow of fresh, dry air, it’s best to keep additional windows open to prevent the inside air from becoming too clammy and uncomfortable. The best air coolers for use depends on the room size. Be sure to look for “cooling area,” “area covered” or similar wording in the model’s description or specifications.
Get More Help Finding the Best Portable Room Air Conditioner
You can easily compare models with different capabilities, features and price ranges when you shop portable air conditioners on Lowes.com. You can also shop for portable air conditioners at your local Lowe’s, where an associate can discuss your cooling needs with you and help you find the perfect solution to keep you comfortable.