Win a 5kW Activair heat pump worth £1,000! Activair air source heat pump from Smarter Energy provides a sustainable source of energy to heat your home at an affordable price. From the surrounding air, the Activair extracts large quantities of low grade, warm air and converts it into heat for domestic heating and hot water. With the electrical power needed being negligible, the homeowner gets more for less as well as looking after the environment.