Choosing the right air-cond size for your home in Malaysia is more important than most people realize.
If your unit is too small, it struggles to cool the room and wastes energy.
If it’s too large, it cools too quickly without removing humidity — leaving the room cold but damp.
At Thiam Seng Electrical Trading Co., with over 38 years of air-conditioning experience in Petaling Jaya and Selangor, we’ve helped thousands of homeowners find the perfect air-cond capacity for comfort and efficiency.
📏 Step 1: Measure Your Room Size
The first step is simple — measure your room’s width and length (in feet or meters).
| Example | Width (ft) | Length (ft) | Area (sq. ft.) |
|---|---|---|---|
| Bedroom | 12 | 15 | 180 |
| Living Room | 20 | 25 | 500 |
If you measure in meters, multiply length × width to get square meters, then convert:
1 square meter ≈ 10.76 square feet.
🔥 Step 2: Calculate the Required Cooling Capacity (BTU)
Air-cond capacity is measured in BTU (British Thermal Units).
As a rule of thumb:
💡 Multiply your room area (sq. ft.) × 60 to estimate required BTU.
| Room Area | Approx. BTU Required | Recommended HP |
|---|---|---|
| 100 – 180 sq. ft. | 6,000 – 10,000 BTU | 1.0 HP |
| 181 – 250 sq. ft. | 10,001 – 13,000 BTU | 1.5 HP |
| 251 – 350 sq. ft. | 13,001 – 18,000 BTU | 2.0 HP |
| 351 – 500 sq. ft. | 18,001 – 24,000 BTU | 2.5 – 3.0 HP |
☀️ Step 3: Consider Room Conditions
Not all rooms are equal — adjust the BTU if your space has these conditions:
| Condition | Adjustment |
|---|---|
| Room with direct sunlight | Add 10% BTU |
| Shaded room | Subtract 10% BTU |
| More than 2 occupants | Add 600 BTU per person |
| Kitchen or equipment-heavy room | Add 4,000 BTU |
For example:
A 250 sq. ft. sunny room → 250 × 60 = 15,000 BTU + 10% = 16,500 BTU → about a 2.0 HP aircond.
⚡ Step 4: Choose Energy-Efficient Models
In Malaysia’s warm climate, your air-cond runs many hours per day — so efficiency matters.
We recommend Inverter-type airconds from trusted brands like:
Panasonic X-Deluxe Inverter Series – quiet, durable, and energy-saving.
Midea Mission Elite Inverter – great value with smart Wi-Fi control.
Haier Smart Cool Series – quick cooling and sleek design.
Inverter models automatically adjust compressor speed, saving up to 40% energy compared to non-inverter units.
🧰 Step 5: Get Professional Installation & Sizing Advice
Even the right BTU won’t perform well if the installation is wrong.
A poor pipe layout or wrong gas pressure reduces cooling and increases electricity bills.
Our Thiam Seng Electrical team provides:
Free site assessment
Accurate BTU and load calculation
Supply & installation of Panasonic, Haier, Daikin and Midea systems
After-sales servicing and maintenance
We ensure your unit performs efficiently from day one.
🏡 Conclusion
Choosing the right air-cond size in Malaysia isn’t just about comfort — it’s about efficiency, cost savings, and long-term performance.
By measuring your space, calculating BTU, and consulting professionals, you can enjoy reliable cooling all year round.
📞 Contact Thiam Seng Electrical Trading Co. at 018-2500089 or email tsetc@thiamseng.com
for professional air-cond sizing, supply, and installation in Petaling Jaya and Selangor.
