An air conditioner with VFD condenser, uses R134a or R410a refrigerant which is more ozone friendly than R22. The condensing unit modulates to meet demand instead of on/off, so is more efficient. Replace the Air-Pro units currently installed in Villas. Possible 2 yr payback. “Inverter A/C” info from wikipedia…
The inverter tag found on some air conditioners signifies the ability of the unit to continuously regulate its thermal transfer flow by altering the speed of the compressor in response to cooling demand.
Traditional air conditioners use a compressor that is either working at maximum capacity or switched off periodically, to regulate the temperature of the room. A thermostat is used to measure the ambient air temperature and switch the compressor on when the ambient air temperature is too far from the desired temperature.
An alternate way to meet the varying cooling demand is to vary (“modulate”) the capacity of the compressor. An air conditioner compressor has two components, a mechanical part – the actual compressor and the electrical part – the motor to drive the compressor. Either of the components can be used to modulate the capacity. In digital scroll compressors – the mechanical Scrolls of the compression mechanism is controlled to modulate and the electric motor runs at constant speed. The other method is to control the speed of the compressors by various means. “Inverter” air conditioners use a variable-frequency drive to control the speed of the motor and thus the compressor.