In fact, the HeatingSave heat loss algorithm can also be used to control air conditioning units in summer. Just like heating, you choose the temperature you want and when you want it and HeatingSave will do the rest automatically, calculating the latest time to switch on the air conditioning to keep cool in summer. Room occupancy sensors may also be used; this time to vary room temperature. The savings with "CoolingSave" are reductions in the electric usage and electricity bill.