Summary of savings measures for room air conditioners and packaged products
Measure |
Comments |
Indicative savings range (%) |
Compressor |
Inverter control, matching speed to cooling demand |
30% (up to 50% in some applications) |
|
DC drive motor; better compressor |
Up to 15% |
Dedicated dehumidifier |
Use dedicated dehumidifier or two stage compressors |
20-40% depending upon the humidity levels |
Improved heat exchangers |
Larger/improved condenser and evaporator |
Up to 25% |
Improved expansion valve |
Electronically controlled |
9% |
|
Thermostatically controlled |
5% |
Variable speed inverter driven fans |
For evaporator and condenser fans |
4% |
Reduced standby (electronics) |
Savings are higher in temperate climates (less usage) and for smaller units |
3% for average systems |
Reduced standby (crank case heater) |
Only applicable in 10% of units for cold weather usage (often reversible units). Savings higher % for temperate climates (less usage) |
Some units: Up to 50% in cold weather climates |
(ARMINES et al., 2009b) See respective technical sections