CALL US TOLL-FREE 1-800-934-9194
No items added.
0 items in your cart    View your cart »
Cart Subtotal: $0.00
Need Help?
  • 1-800-934-9194 to speak with any of our knowledgeable representatives.

  • Use our online form to send us an email and we'll respond as quickly as we can.
  • Check out our FAQs

Frequently Asked Questions About Portable Air Conditioners

Article Image: "Portable Air Conditioners Frequently Asked Questions (FAQ)"

Portable air conditioners are great cooling solutions for single rooms and can assist a struggling central HVAC system. They're commonly used in bedrooms, dens, computer rooms, garages, and many other places.

For easy accessibility to the topics in this article, use the list below:

What is a portable air conditioner?

A portable air conditioner (PAC) is a self-contained portable system ideal for cooling single rooms. They typically sit on the floor and come with an installation kit for quick set up. Most models also have wheels so you can move them to different rooms, making them a nice alternative to window units. 

What is required to set up a portable AC?

Requirements vary based on the model, but set up is typically quick and painless. Since all portable ACs remove warm air and moisture as they cool, the air has to be exhausted to another location--generally outside through an included window kit. Window kits have a window slider and exhaust hose(s), which can easily be set up to exhaust warm air outside. Select models can also be vented into a drop ceiling or through a wall. Once you set up the exhaust hose and window kit, you can simply plug in your AC and start cooling!

For more information about venting your portable air conditioner, read our Knowledge Center article How to Vent Your Portable AC

Want a quick overview of portable ACs? Check out our video below!

Will I need to empty water? Will water collect in the portable air conditioner?

We know PACs remove warm air and moisture from your air, and that they exhaust warm air outside through a window kit. But what about the moisture? There are a few ways PACs deal with this condensate water:

  • Fully Self-Evaporative Models: Advanced portable ACs automatically evaporate moisture out the exhaust hose along with warm air. This means you'll very rarely (or never) have to deal with the collected condensate water. These are popular models thanks to their continuous and hassle-free operation. Brands with fully self-evaporative models include DeLonghi portable ACs, Whynter models, and Avallon portable ACs.
  • Gravity Drain and Condensate Pump: Another common way to get rid of collected moisture is to attach a drain hose, which select models come include with purchase. Simply attach the hose to the drain port and direct water into a drain or another location. Many models are also designed to use condensate pump accessories, which help pump the drained water through a hose to drain out of a window, for example, or across long distances to an alternate location.

  •  Manual Removal: Standard portable air conditioners have buckets that need to be emptied periodically--from as often as every 8 hours to just once a month. Depending on your humidity and time of use, water will collect inside the unit and you'll simply have to turn it off, empty the bucket, and then replace it before cooling starts again.

What size air conditioner (BTU level) do I need?

Similar to other types of room air conditioners, portable ACs measure their power in BTUs. The more BTUs of cooling power a PAC has, the more room it can cool. Use the following guidelines to determine the portable air conditioner capacity that your space requires. These calculations assume that you have standard 8-foot ceilings.

  • 7,500 BTUs will cover 150 sq. ft. x 8-ft. ceiling = 1,200 cubic feet
  • 9,000 BTUs will cover 200 sq. ft. x 8-ft. ceiling = 1,600 cubic feet
  • 10,000 BTUs will cover 300 sq. ft. x 8-ft. ceiling = 2,400 cubic feet
  • 12,000 BTUs will cover 400 sq. ft. x 8-ft. ceiling = 3,200 cubic feet
  • 13,000 BTUs will cover 450 sq. ft. x 8-ft. ceiling = 3,600 cubic feet
  • 14,000 BTUs will cover 500 sq. ft. x 8-ft. ceiling = 4,000 cubic feet

We typically classify our portable ACs according to the following room square footage guidelines:

Keep in mind that you may need less BTU power if you live in a cooler region or only plan to use your PAC in the cooler evening hours. On the contrary, if you live in a warmer region or plan to use the unit during peak temperature hours you might require more BTU power. This is also true if you will be running multiple heat-generating appliances in the same room or have a lot of natural sunlight that warms your space. 

For more in-depth information about choosing a the right cooling capacity, read our Portable Air Conditioner Buyer's Guide and our article 5 Things to Consider When Buying a Portable Air Conditioner.

If you need help weighing the many factors that affect portable AC performance and ultimately making a decision about the right BTU power for your room, please call us at 1-800-934-9194 for a detailed consultation.

Can I lengthen the exhaust hose?

In general, you should not lengthen the exhaust hose of a portable AC. Depending on the manufacturer, this may void your warranty and potentially cause your air conditioner to overheat.

Can I discharge the hot air out of a sliding glass door or sliding glass window?

Danby DPAC12099 Vertical Installation

Most portable air conditioners can be easily vented through traditional double-hung windows, also known as vertical sash windows, using window kit accessories. These same accessories can typically be used for venting a portable air conditioner through a sliding glass window as well. For example, the Danby DPAC10011 User Manual provides detailed instructions for installing this portable AC into a sliding glass window. The configuration should look similar to diagram on the left.

Venting portable air conditioners through sliding glass doors is much more complex than simple window installations. The window installation kits used for traditional windows typically don’t extend far enough to cover the height of the door. For sliding glass door installations, we recommend using at least two window installation kits that are designed to work with your particular portable AC to completely cover the door opening. The two window installation kits can then be secured together using screws. Plywood and Styrofoam can also be used as covering and insulation material when installing a portable air conditioner into your door frame.

Regardless of the installation that you intend to perform, always consult the owner’s manual for instructions, guidelines, and cautionary information.

What should I use to cool a server room?

Portable air conditioners are often used for supplemental cooling in computer server rooms or as the primary cooling source in these rooms on weekends, when central air conditioning may be shut off. We recommend portable ACs that use fully self-evaporative technology for these applications. This means that you will never have to manually remove collected condensation and can leave the portable AC running unattended.

Most server rooms do not have easy window access and may be interior rooms, which makes venting a complication. As a solution, you can direct the hot air discharge hose into a drop ceiling space or through a hole in the wall to an adjacent room. Our Movincool CM12 is a great choice for server rooms because it is a ceiling-mounted portable air conditioner. It can be easily mounted above a standard drop-ceiling, as shown below.

Movincool CM12 Installation Diagram

Other commercial portable ACs are also available with complete kits that allow you to easily discharge hot air into a drop ceiling while allowing the unit to remain at floor level. Less expensive residential units may also be used, but they must be elevated toward the ceiling to allow their hot air discharge hoses to reach full ceiling height.

I have a casement/crank-out window. Can I configure my PAC to exhaust air out of this type of window?

Unfortunately, there are no portable air conditioner units with a window kit that will fit a casement window. Some customers have creatively fashioned a solution using Plexiglas to cover their entire window area. Then, they cut a small hole into the Plexiglas for the hot air exhaust hose.

What electrical requirements do portable ACs have? What about energy consumption?

Most PACs use typical household 115/120 Volt power and require no special wiring or outlets. Of course, as air conditioners can draw a significant amount of energy, you must use caution not to overload a circuit with multiple high-energy-consumption devices. Some of the higher BTU PACs (14,000 BTU or higher) or the commercial-grade portable air conditioners may or may not require special outlets and wiring. Please read product descriptions for more information. Energy consumption will vary depending on the model and your environmental conditions.

Will a portable air conditioner work for multiple rooms?

It depends. Similar to a window-mounted air conditioner, a portable air conditioner is effective in cooling its immediate area. However, the cold air will not travel down the hallway or through narrow doorways. If a space has very large openings from one room to another, then it is possible that adjacent spaces may experience a slight cooling effect. Fans can also be used to help circulate the air for additional cooling coverage.

What is the difference between a single-hose design and a dual-hose design?


Some portable air conditioners have one hot air exhaust hose, and some have two air hoses: one for air intake and one for hot air exhaust. A single-hose portable air conditioner will take air from the room it's in, cool it, and return most of that air back into the room. During this process, a small amount of that air will be used to cool the unit and will be subsequently blown out of the air conditioner's exhaust hose. This creates slightly negative pressure within the room being cooled, as a small amount of air is constantly being removed from the room. If this negative pressure is anticipated by drawing unconditioned air into the room from adjacent spaces, then the cooling efficiency is slightly affected.

A dual-hose portable air conditioner works by taking in air from the outside through one hose and using that air to cool the unit. The hot exhaust air is then expelled through the second hose. This process does not create negative pressure inside the room being cooled. However, there is a tradeoff. Dual-hose units use warmer, unconditioned air to cool their compressors, which results in slightly less efficiency. They also employ two internal fans, which can mean slightly higher energy usage. At this time, we have not seen conclusive evidence that either solution, single- vs. dual-hose, is better than the other when all factors are considered.

Do I have to remove the screen from the window when using my window kit?

Most of our customers can leave the screen in the window, because the exhaust hose of their portable AC does not extend out from the window. Check the product description for the PAC you're buying to make sure this is the case for you. 

Still Have Questions?

For more information on a specific portable air conditioner or any of our other products that can improve your indoor air, review our extensive product listings and visit our Knowledge Center. Not sure what’s best for you? We can take the guesswork out of decision-making. Contact one of our air treatment specialists toll-free at 1-800-934-9194. We want to help make your indoor environment healthy and comfortable.

Additional Resources

Bestselling Portable Air Conditioners

If you can read this, don't touch the following text fields.

If you can read this, don't touch the following text fields.

If you can read this, don't touch the following text fields.

If you can read this, don't touch the following text fields.

If you can read this, don't touch the following text fields.

If you can read this, don't touch the following text fields.

If you can read this, don't touch the following text fields.


Customer Favorites

If you can read this, don't touch the following text fields.

If you can read this, don't touch the following text fields.


Featured Brands

Soleus Air

Newsletter Subscriptions

Thanks for subscribing to our newsletter! You should begin receiving regular emails from us shortly!