DOMANKI BTU
A practical portable air conditioner (14000 BTU) for proper, portable cooling around the home.
The Best Portable Air Conditioners for Large Rooms (UK 2026)
Large and open-plan rooms need a high-BTU portable air conditioner - typically 12,000 BTU or more - to actually bring the temperature down. Undersize it and the unit runs flat out without ever cooling the space.
What to look for
- 12,000 BTU or more for large or sunny rooms.
- A good flow and fan range to move cooled air around.
- A dehumidifier mode for muggy days.
- Sturdy castors, as bigger units are heavy.
Our top picks
#1
#2 
Tanoxo BTU Portable Air Conditioner
A practical portable air conditioner (12000 BTU) for proper, portable cooling around the home.
#3 
BTU Portable Air Conditioners
A practical portable air conditioner (14000 BTU) for proper, portable cooling around the home.
#4 
Portable Air Conditioners BTU
A practical portable air conditioner (12000 BTU, 3-in-1) for proper, portable cooling around the home.
Frequently asked questions
How many BTU for a large living room?
Around 12,000-14,000 BTU suits most large living rooms, and 14,000+ for very large or open-plan spaces with lots of sun. Bigger rooms and south-facing windows push the requirement up.
Bottom line
Our top pick is the DOMANKI BTU (our score 8.6/10) - A practical portable air conditioner (14000 BTU) for proper, portable cooling around the home..