Find a starting size for your room.
Adjust your room, explore the diagram, and estimate cooling capacity before speaking with an installer.
Your room, visualised
Illustration, not a construction plan. Unit and window positions are examples.
Enter length and width between 2–12 m, and height between 2–5 m.
BTU/h ·
Rounded up from the upper estimate as a discussion starting point, not a purchase recommendation. Actual model capacity and number of units need a site assessment.
High ceilings or large spaces need a site survey. More than one unit may be needed for even cooling.
Using LINE? Copy the result, then paste it into your MCS chat.
Calculation method & limitations
Floor area × 800–850 BTU/h per m² for lower heat, or 900–1,000 for higher heat, following Carrier Thailand’s preliminary guidance. MCS then applies a height multiplier: ceiling height ÷ 2.7, with a minimum of 1. This height adjustment is a rough assumption, not an engineering heat-load calculation.
BTU/h
For preliminary estimates of typical residential rooms only. This does not model glazing area, insulation, roof heat, occupants, appliances, ventilation or air leakage. Kitchens, shops, crowded rooms and cold storage require a separate specialist assessment.
The kW figure is cooling capacity, not electrical consumption or an electricity-bill estimate.
Read Carrier’s BTU sizing guidance ↗