AC Size by Room Area
Floor area is useful for a quick starting point, but ceiling height, city, sun, insulation, windows and occupancy can move the result substantially.
Reviewed: 23 September 2026
| Room area | Use this as a starting point |
|---|---|
| 15 m² | Calculate 15 m² → |
| 20 m² | Calculate 20 m² → |
| 25 m² | Calculate 25 m² → |
| 30 m² | Calculate 30 m² → |
| 40 m² | Calculate 40 m² → |
| 50 m² | Calculate 50 m² → |
Calculate the volume-based starting point for any room
Use this when your room is not one of the table examples. It calculates only the base volume rule before climate, sun, insulation, glazing and occupancy adjustments.
Why area alone is not enough
A shaded bedroom with good insulation is not the same load as a top-floor living room with large glazing and direct sun. Use the calculator for a personalised estimate rather than treating an area table as a final specification.