Aircon BTU sizing for Singapore homes
The wrong BTU rating means high bills or a room that never cools. Here's how to size aircon for Singapore conditions.
- Roughly 400–600 BTU per square metre for Singapore's climate.
- Oversized units short-cycle, cooling poorly and running humid.
- Match the system (multi-split) to total indoor load and ledge space.
A simple BTU rule of thumb
For Singapore's heat and humidity, a common starting point is 400–600 BTU per square metre of room area, adjusting up for sun-facing rooms, large windows or high occupancy.
- Small bedroom (~9 sqm): ~9,000 BTU
- Master bedroom (~14 sqm): ~12,000 BTU
- Living/dining (~24 sqm): ~18,000–24,000 BTU
Matching the system
Most flats use a multi-split system — one outdoor condenser serving several indoor units. The condenser must handle the combined load and fit your aircon ledge. An installer will confirm the right combination.
Frequently asked questions
How many BTU do I need for an HDB bedroom?
A typical bedroom needs about 9,000 BTU; a master bedroom around 12,000 BTU, adjusted for sun exposure and window size.
Is a bigger aircon always better?
No. Oversized units short-cycle — they cool the air fast then switch off before removing humidity, leaving the room cold but clammy and wasting energy.
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