The new inverter range of Calorex heat pumps. Include: higher COPs than traditional on/off heat pumps, F-Gas compliance with the use of the low GWP R32 refrigerant, a wider range of power ratings from 8 to 25kW, a significant reduction in noise with a 9-11 dB(A) sound reduction and the option for "Whisper Mode", Wi-Fi connectivity for remote control (on the I-PAC range only), a compact size with a small footprint that complies with permitted development rights, and multifunction operation that can be set to heat only, heat/cool, and cool.