The new Samsung AR4500 range with Digital Inverter saves money by constantly maintaining pre-set temperature without constantly switching on and off.  Cooling capacities from 2.50 kW up to 6.45kW, heating from 2.6 kW up to 6.75 kW. EERs (Cooling W/W) are from 3.01 up to 3.21 and COPs (Heating W/W) up to 3.55. Piping lengths (indoor/outdoor) are 15 to 25 metres, with a height difference of 10 metres.  Anti-corrosion fins on outdoor units.