What Size AC Unit
Do You Actually Need?
Too small never cools. Too big short-cycles, leaves the air clammy, and dies early. Get your real BTU number in 60 seconds.
Step 1. The Room
Measure the room you want to cool. Open floor plans count as one room.
Recommended Capacity
Calculated Load
Buy This Size
If Portable AC
This is a solid shopping estimate. For central systems, have your installer run a full Manual J load calculation before you sign anything. If they size your system by square footage alone, that's a red flag.
Free. Get Your Sizing Report + Recommended Models
We'll email your numbers plus a shortlist of units that match your size, and the oversizing traps to avoid when shopping.