Window AC vs portable AC: which to buy and when
A window AC vs portable AC comes down to cost, noise and your windows. Here is a simple table, the rules, and when to buy to pay less.
Mathieu Roux4 min read
Verdict: Window AC if your window fits one, portable if not. Window units often cost less and cool better. Portable units help when a window unit is not allowed.
If your window can hold a unit and the rules allow it, a window air conditioner is usually the better buy. A portable unit makes sense when you cannot fit or are not allowed to use a window unit.
For timing, see best time to buy a fan or air conditioner.
Which wins on what?
| Question | Window AC | Portable AC |
|---|---|---|
| Cooling for the cost | Often better | Often weaker |
| Price | Lower | Higher |
| Noise | Usually lower in the room | Usually louder |
| Install | Window, brackets | Hose and window kit |
| Floor space | None | Takes floor space |
| Works with casement windows | Rarely | Often |
| Storage | Heavy to move | Easier to roll |
Pick a window AC if
- You have a standard sliding window.
- You want more cooling for the money.
- You do not mind a one-time install.
Pick a portable AC if
- Your building bans window units.
- Your window is a type that cannot hold a unit.
- You need to move it between rooms.
Rule: Check the window and the building rules before you look at price.
What should you watch for?
Size the unit to the room. A unit that is too small runs all day. One that is too large cools fast but does not remove moisture well. Check the maker's room size guide.
Look at the noise rating and the energy rating. A cheaper unit that costs more to run is not always cheaper over a summer. Also, a portable unit with one hose pulls in warm air from outside, so it can feel weaker than its rating.
Last year's model is often a good buy. See last year's model vs the new model.
When should you buy?
Prices are often lower in late summer clearance and early spring. During a heat wave, stock can run short and prices hold. If you can wait, set a target price and watch.
What does it cost to run?
Both use power, and the bill depends on size, hours and local rates. A window unit usually cools more per watt. These numbers are round and made up. If a window unit uses 600 watts and a portable unit uses 900 for the same room, the portable one costs about half as much again to run. Over a long summer that adds up.
How do you install a window unit safely?
Follow the maker's guide. Use the supplied brackets, support the unit, and seal the gaps. A unit that is not secured can fall. If the window is high or hard to reach, ask someone to help, or hire a pro. Check your building rules first.
Rule: Safe install beats a quick install.
What if you rent your home?
Ask the landlord before you buy. Some buildings ban window units or require a certain type. A portable unit may be the only option, and it moves with you. Keep the receipt and the manual, since a unit that does not fit your next place can be resold. Check the return window before you open the box.
How do you cut the cost of cooling?
Close the blinds in the day, use a fan to move air, and seal gaps around the window. A cooler room needs less power from the unit. Clean the filter on the schedule the maker gives, since a clogged filter makes the unit work harder.
Quick questions
Which is cheaper to run, window or portable?
In general a window unit is more efficient for the same room size. Check the energy label.
Can I use a portable AC without a window?
No. It needs a hose out of the room to vent heat.
What size AC do I need?
It depends on room size, sun and ceiling height. Use the maker's chart.
When is the best time to buy?
Often late summer or early spring. Dates change, so check the price history.
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