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Same-Day Aircond Installation & Servicing Across KL & Selangor — From RM199
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Free Instant Estimate
Find the right aircond capacity for your room in Malaysia. Enter your room size, room type, usage intensity and heat exposure — the calculator recommends the exact HP, BTU and suitable aircond capacity, using the standard Malaysian sizing formula (~25 BTU per square foot with adjustments).
Free Instant Estimate
Room size + type + usage + heat exposure → the right HP, BTU and aircond capacity for your space.
12 × 10 = 120 sqft
Based on the standard Malaysian rule of thumb: ~25 BTU per square foot, adjusted for room type (kitchen/shop need more), usage intensity and heat exposure (west-facing and top-floor rooms need up to 25% more). Oversized units short-cycle and waste electricity; undersized units never cool properly. Our technician confirms the final size during the site survey.
Enter your room length and width in feet — the calculator works out the area in square feet automatically.
Choose the room type: bedroom, master bedroom, living room, home office, kitchen or shop/retail. Kitchens and shops need more cooling power.
Select the usage intensity — light, standard or heavy (12+ hours a day or unusually hot rooms).
Select the heat exposure — low (shaded/north-facing), medium (partial sun) or high (west-facing or top floor).
The calculator applies the standard formula: area × 25 BTU, adjusted by room type, usage and heat exposure multipliers.
The result shows the recommended HP, BTU and suitable aircond capacity — plus the installation starting price for that size.
The base rule: ~25 BTU per square foot. A 120 sqft bedroom needs about 9,000 BTU (1.0 HP); a 250 sqft living room needs about 12,000–18,000 BTU (1.5–2.0 HP).
Master bedrooms (+10%), living rooms (+15%), kitchens (+30%) and shops/retail (+25%) need more cooling than standard bedrooms.
Rooms used 12+ hours a day, or rooms with lots of electronics and appliances, need ~15% more capacity (heavy usage multiplier).
West-facing rooms and top-floor units absorb much more heat — up to 25% more capacity is needed (high exposure multiplier).
Rooms with ceilings above 10 ft need extra capacity — about 10% more per extra foot. Use the BTU calculator for a detailed height-adjusted estimate.
Each person beyond two adds about 600 BTU, and each large window beyond the first adds about 600 BTU. The detailed BTU calculator includes both.
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.
The evaporator is the finned coil inside the indoor unit where cold refrigerant absorbs heat and moisture from the room air. Because it is permanently wet during operation, it is where mould, bacteria and dust bind together into the grey film that causes the sour smell and the drop in airflow. Filters catch the coarse dust; the coil holds the rest.
If the airflow feels weak right after a filter wash, the coil — not the filter — is the blockage, and that needs a chemical wash.
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.
A 12×10 ft room is 120 sqft. Using the standard formula it needs about 9,000 BTU — a 1.0 HP aircond is the right size for a normal bedroom with standard sun exposure.
A 1.5 HP aircond (12,000 BTU) typically cools 150–250 sqft. It suits larger master bedrooms, small living rooms and home offices. For rooms above 250 sqft, consider 2.0 HP (up to 380 sqft).
A typical Malaysian living room of 200–300 sqft needs 1.5–2.0 HP. West-facing or open-concept living rooms with high heat exposure should go up a size — 2.0–2.5 HP — to avoid long cooling times and high electricity bills.
The Malaysian standard is about 25 BTU per square foot, adjusted for room type, sun exposure, ceiling height, occupants and windows. A 100 sqft bedroom ≈ 2,500 BTU base before adjustments ≈ 1.0 HP (9,000 BTU).
An undersized unit runs non-stop, never cools properly and wastes electricity. An oversized unit short-cycles — it cools the air quickly but never dehumidifies properly, which makes the room feel cold and damp, and it wears out faster. Getting the size right matters as much as the brand.
Usually yes — most Malaysian master bedrooms are 150–250 sqft, which is exactly the 1.5 HP sweet spot. If your master bedroom is west-facing, has high ceilings or large windows, check the detailed BTU calculator — you may need 2.0 HP.
Estimates are instant; the final price is confirmed before any work begins. No hidden charges, 1-month workmanship warranty, same-day service across KL & Selangor.