Measure this first

I check the window sash width and vent gap for every portable air conditioner. This is for shoppers who need a specific fit, not a generic cool box.

By Jonah Reeves · Home editor · Home desk · Gadget Evaluator Lab

Jonah wouldn't reorder this if… Measure your window sash width and the vertical gap for the exhaust hose. Match those numbers to the unit's stated dimensions before you buy.

A portable air conditioner is a fit problem first and a cooling problem second. If the unit is too wide for your sash or the hose has no room to vent, it will not work, no matter how many BTUs it claims.

Look at the product photo to see the unit's physical width and the hose diameter. Then check the listing for the exact window kit dimensions to ensure it matches your opening.

1. Best overall: 3-IN-1 Portable Air Conditioners, 5400mAh Built-In Battery…
2. Best value: 3-IN-1 Portable AC Unit with Remote, 24" Windowless Portable Air…
3. Upgrade pick: Portable Air Conditioner Fan, Rechargeable 5-IN-1 Personal Mini…
4. Lighter option: MEPTY 14000BTU Portable Air Conditioners, Portable AC Unit with…
5. Spare to keep: Portable Air Conditioner 16000 BTU, WiFi App, 6-in-1, 750 Sq. Ft.
6. Check the size: Uthfy Portable Air Conditioners, 14000BTU Portable AC Unit with…
7. Worth a second look: Portable Air Conditioners with App Control, Air Cooler, 2000mAh…
8. Only if it fits: Portable Air Conditioners, Air Cooler Evaporative Personal Mini…

Best overall

3-IN-1 Portable Air Conditioners, 5400mAh Built-In Battery…

What fitsThis unit is a personal evaporative cooler, not a true compressor AC, so the fit check is about your desk footprint and battery life.

What to checkThe title specifies a 5400mAh built-in battery and 1200ml tank, which means you are buying a fan with ice packs, not a room-chilling machine.

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Best value

3-IN-1 Portable AC Unit with Remote, 24" Windowless Portable Air…

What fitsThe critical fit detail here is the 24-inch height and the 'windowless' designation.

What to checkThis unit is designed to stand on the floor, so you must measure the vertical clearance in your room to ensure it does not hit ceiling fans or light fixtures.

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Upgrade pick

Portable Air Conditioner Fan, Rechargeable 5-IN-1 Personal Mini…

What fitsThis is a 5-in-1 personal mini cooler with 7 color lights, so the fit check is about your desk aesthetic and the unit's width.

What to checkThe title highlights the 3-speed evaporative cooling and humidifier function, which means it is a small, tabletop device.

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Lighter option

MEPTY 14000BTU Portable Air Conditioners, Portable AC Unit with…

What fitsThis is a 14000BTU portable air conditioner that cools up to 700 square feet, so the fit check is about your room size and the unit's footprint.

What to checkThe title specifies a dehumidifier and sleep mode, which means it is a full-sized appliance that requires a dedicated outlet.

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Spare to keep

Portable Air Conditioner 16000 BTU, WiFi App, 6-in-1, 750 Sq. Ft.

What fitsThis 16000 BTU unit is a 6-in-1 system that cools 750 square feet, so the fit check is about your room's square footage and the unit's width.

What to checkThe title highlights WiFi App control, which means you need a stable internet connection in the room where the unit is placed.

Buy at Amazon

Check the size

Uthfy Portable Air Conditioners, 14000BTU Portable AC Unit with…

What fitsThis 14000BTU portable AC unit features a self-evaporating system, which means it does not require a drain hose, so the fit check is about the unit's width and the outlet type.

What to checkThe title specifies a child lock and 24H timer, which are useful for safety and convenience.

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Worth a second look

Portable Air Conditioners with App Control, Air Cooler, 2000mAh…

What fitsThis portable air conditioner has a 2000mAh battery and app control, so the fit check is about your desk footprint and the unit's width.

What to checkThe title highlights the battery life, which means it is a personal cooler, not a room-chilling machine.

Buy at Amazon

Only if it fits

Portable Air Conditioners, Air Cooler Evaporative Personal Mini…

What fitsThis portable air conditioner has 3 wind speeds and a 2-4-8H timer, so the fit check is about your desk footprint and the unit's width.

What to checkThe title highlights the colorful night light, which means it is a personal cooler with a decorative feature.

Buy at Amazon