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Same-Day Aircond Installation & Servicing Across KL & Selangor — From RM199
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BTU Calculator
Answer 5 quick questions and we'll recommend the exact HP you need — plus the installation cost. No guesswork, no oversizing.
12 × 10 = 120 sqft
Measure your room's length and width in feet (ft).
Multiply length x width to calculate the room's area in square feet (sqft).
Multiply the area by 25 to get the base BTU cooling power required.
Adjust for room type (e.g. master bedrooms need +10%), sun exposure (west-facing rooms), ceiling height, occupants, and number of windows.
Match your final calculated BTU to the required Horsepower (HP): 9,000 BTU is approx. 1.0 HP.
A 1 HP (Horsepower) aircond is typically suitable for cooling a room size of 100 to 150 square feet. This is ideal for standard bedrooms or study rooms in Malaysia.
A 1.5 HP aircond is perfect for rooms ranging from 150 to 250 square feet. It is commonly used for larger master bedrooms, small living rooms, or home offices.
The basic formula is Room Length (ft) × Room Width (ft) × 25 BTU. You can adjust this by multiplying for room type (bedrooms need less cooling, kitchens need more), sun exposure (west-facing or top floors need extra BTU), and number of occupants.
Definitions
Short, plain-language definitions of the terms used above — written by the technicians who do the work, not copied from a manufacturer brochure.
BTU per hour measures how much heat a unit removes from a room in an hour. A 1.0 HP wall unit is roughly 9,000 BTU/h and a 1.5 HP is roughly 12,000 BTU/h. Room area sets the baseline, then you add capacity for west-facing windows, a top-floor ceiling, high occupancy or kitchen heat.
Oversizing is a real mistake: an over-large unit hits temperature fast, short-cycles, and leaves the room cold but damp.
HP is the informal Malaysian shorthand for cooling capacity, carried over from compressor horsepower. In practice 1.0 HP ≈ 9,000 BTU/h, 1.5 HP ≈ 12,000 BTU/h, 2.0 HP ≈ 18,000 BTU/h and 2.5 HP ≈ 24,000 BTU/h. Service, chemical wash and installation prices are all quoted against these bands, which is why the technician asks for HP before quoting.
HP is printed on the indoor unit's side label and on the outdoor nameplate — check there rather than guessing from room size.
A ceiling cassette is recessed into the ceiling and blows air out of two or four sides, which suits square shoplots, meeting rooms and open-plan offices better than a wall unit. Servicing it is a different job: the technician works overhead off a ladder, drops the face panel, and often has to deal with a condensate pump rather than a gravity drain.
Cassette work is priced separately from wall units — chemical wash for a 1.0–1.5 HP cassette starts at RM 220.
Side-by-side comparison
Floor area is the starting point; heat load from sun, ceiling height and occupancy moves the answer up a size.
| What to compare | 1.0 HP (≈ 9,000 BTU/h) | 1.5 HP (≈ 12,000 BTU/h) |
|---|---|---|
| Typical room | Small bedroom up to about 120 sq ft | Master bedroom or small hall, 120–180 sq ft |
| Afternoon sun on the wall | Struggles — size up | Copes |
| If oversized | Rarely a problem | Short-cycles, room cold but clammy |
| Published installation price | RM 199 | RM 199 |
In short: Measure the room and count the west-facing glass before choosing; the two sizes cost the same to install, so pick on heat load, not on price.