A non-inverter compressor has two states: full power and off. It cools past your set temperature, stops, lets the room warm up, then slams back on. An inverter compressor varies its speed instead, running slowly to hold the temperature it has already reached.
Holding a temperature takes far less energy than reaching it. In a bedroom used six hours a night, an inverter unit typically draws 30 to 40 percent less electricity than a comparable non-inverter unit. At current tariffs that is most of the price difference back within two cooling seasons.
| Non-inverter 1.5 ton | Inverter 1.5 ton | |
|---|---|---|
| Purchase price | Lower | ৳8,000 – ৳15,000 more |
| Six hours a night | Roughly 7 units | Roughly 4.5 units |
| Noise at night | Cycles on and off audibly | Steady and quiet |
| Temperature swing | ±2 degrees | ±0.5 degrees |
| Best for | Rooms used an hour or two | Bedrooms, offices, daily use |
- Up to 120 square feet — 1 ton
- 120 to 180 square feet — 1.5 ton
- 180 to 250 square feet — 2 ton
- Add half a ton for a top-floor room, a west-facing wall, or a kitchen doorway
- Is the bracket, copper pipe and vacuum pump included in the installation?
- How long is the compressor warranty, separate from the unit warranty?
- Who services it in year three — the brand or the shop?
