Autosave on
BTU calculator for the Algarve
Room volume, insulation, glass, sun and people — not a square-metre guess. Autosaves on this device.
Marina glass and large living rooms need multi-split, not a single wall unit.
Step 1 · Room basics
metres
metres
metres
Area: 20.0 m² · Volume: 54.0 m³
Total requirement
13,600 BTU/h
Equivalent: 3.99 kW
Recommended unit
18,000 BTU · Daikin FTXM50
5.0 kW wall split
Confidence88%
Rises when glass type, insulation and location are set. A survey still wins.
Breakdown
- Envelope (volume × climate)11,610 BTU
- Windows & sun1,637 BTU
- Extra occupants0 BTU
- Appliances / kitchen320 BTU
Heating (winter): 8,400 BTU/h · 252 BTU/m³
Build the full planUndersized units run constantly, miss 35°C afternoons, and die early. We round to the next honest Daikin size.