Right-size your AC, mini split, or heat pump

BTUFit › Guides

Sizing guides

The calculators give you a number. These explain the decisions around it.

ROOM AREA, SQ FT
Why a bigger AC is worseShort cycling, clammy rooms, dead compressors: the case against "round up to be safe." BTU, tons, SEER2 & AFUE, decodedThe five numbers on every HVAC spec sheet and what each one means for your bill. Manual J vs. rules of thumbWhen square-footage math is enough, and when to insist on the real calculation. Mini split vs. window ACSame room, two machines: cost, noise, efficiency and when each one wins.