When summer heat waves strike, a portable air conditioner can provide much-needed relief in rooms that are difficult to cool. While not a substitute for central AC, these units can offer flexible cooling solutions for rarely used spaces, small rooms, or upstairs areas. Before purchasing, think about BTU rating, room size, energy efficiency, and useful features. This guide covers everything you need to know to choose the best portable AC for your home.
What Is a Portable Air Conditioner?
Portable air conditioners, also known as room or floor air conditioners, are compact cooling units that can cool a single room or small space. Unlike traditional options, they aren’t installed in closets or windows. Instead, homeowners can move them from room to room within the house—as long as a power outlet and window for venting is nearby.
Due to their size, portable air conditioners have limited cooling capacities. However, they are ideal if your HVAC unit is broken or in rooms where your current system struggles to cool properly.
How To Choose a Portable Air Conditioner for Your Home
Before purchasing a new portable air conditioner, review your cooling needs and goals. You could end up overspending if you go with a larger unit with more bells and whistles than you need, or you could accidentally buy an inefficient unit for the space.
Cooling Needs
Portable air conditioners’ cooling capacities are measured in British thermal units (BTUs). For the best performance and energy efficiency, homeowners need to match the BTU rating to the room size. According to Angi, a 150-square-foot room needs 5,000 to 6,000 BTUs, while a 500-square-foot room needs 11,000 to 12,000 BTUs.
An undersized unit won’t cool effectively, while an oversized one will waste electricity and struggle to dehumidify the space.
Features
Modern portable air conditioners offer a range of convenient features beyond basic cooling. These are just a few common features that run standard or optional on models:
- Casters for easy mobility
- Digital controls for temperature and timer settings
- Wi-Fi connectivity and smartphone app control
- Multiple fan speeds
- Dehumidifier mode
- Adjustable louvers to direct airflow
- Sleep mode for energy-savings
- Washable filters
- Auto-restart after power outages
Keep in mind that some features will increase the overall price of the unit.
Energy Efficiency
Portable air conditioners are less energy-efficient than their traditional counterparts, but that doesn’t mean you shouldn’t think about energy efficiency at all. Look for ENERGY STAR-certified models, which meet strict efficiency standards set by the U. S. Environmental Protection Agency. These units consume less electricity and can lead to significant savings on energy bills over time.
The Energy Efficiency Ratio (EER) is another important metric. The higher the EER, the more efficient the air conditioner. When comparing models, opt for units with higher EER ratings to maximize energy savings.
Programmable timers can also help you save. These settings allow users to set the AC to run only when needed, reducing unnecessary operation and lowering overall energy consumption.
Venting Requirements
All portable air conditioners need to expel hot air, usually with a flexible exhaust hose through a nearby window. You’ll need a unit with a long enough hose that reaches the window. If you can’t find one, some models have separate hose extensions you can purchase.
While windows are the most popular venting setup for portable ACs, they’re not the only option. A few alternatives include:
- Through-the-wall venting: Creates a permanent opening in an exterior wall
- Drop ceiling venting: Ideal for basements or offices with suspended ceilings
- Dryer vents: Can sometimes be modified to accommodate a portable AC exhaust
Homeowners should also give thought to the different available types of portable air conditioners, mainly single-hose versus double-hose, as they draw and vent air differently. Single-hose models are best for smaller rooms and the least expensive of the two, but they can struggle with efficiency. Double-hose units are more efficient, larger, faster, and more costly.
Noise Levels
Portable air conditioners are often loud. When selecting a unit, pay attention to the published decibel ratings. The lower the rating, the quieter the AC, which is especially important in bedrooms.
You can also reduce the noise by placing the units on a level surface to reduce vibrations or placing rugs or curtains in the room. Some portable models feature “quiet” or “sleep” modes that reduce fan speed and noise levels.
Cost
Portable AC units tend to cost less than traditional systems and even window units. However, the BTU rating, additional features, and design can all impact the price.
The average unit cost of a portable AC unit is $100 to $500.*
Most homeowners can easily install this system on their own, but if you can’t vent the unit through an existing window, you will likely have to pay a professional to modify your home. Professional installation can cost anywhere from $80 to $700.*
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Here are a few tips to help you get the best value:
- Look for end-of-summer sales and promotions, which often feature significant discounts on cooling appliances.
- Compare prices across multiple retailers, both online and in-store.
- Purchase during the off-season (fall or winter) when demand is lower and prices may be reduced.
- Factor in long-term energy savings when choosing between models. A more efficient unit may cost more up-front, but you’ll save money over time through lower electricity bills.
*Costs in this article sourced from Angi.
Maintaining Your Portable Air Conditioner
Portable air conditioners generally require minimal upkeep, but proper maintenance can improve their overall efficiency and performance. Clean or replace air filters monthly, and clean condenser coils periodically to prevent dust buildup, which can hinder heat exchange.
If your unit has a condensate collection tank, regularly empty it or set up a drainage system. Regularly inspect the exhaust hose for blockages.
FAQs About Portable Air Conditioners
How long do portable ACs last?
Portable AC units typically last around 6 to 10 years with regular filter cleaning, periodic maintenance, and adherence to manufacturer guidelines.
Can you run a portable AC with the window closed?
Yes, but in most cases, it is easiest to vent a portable AC unit through the window. If you can’t or don’t want to use a window, you can install a dryer vent through an exterior wall for venting the unit.
Do portable ACs require venting outside?
Yes. Venting the hot air outside is vital for cooling functionality and performance.
What portable AC size do I need?
Match the BTU rating to the space’s square footage. Over- or undersized units won’t cool properly.
Can I use one portable AC in multiple rooms?
It’s best to buy units for each room. Open doors between multiple spaces may help cool air in adjacent rooms to some degree, but portable AC units are only designed to cool single spaces.
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