Energy waste in heating and cooling.

Heating and cooling systems by and large are controlled by simple on and off methods with out anticipation of the actual heat loss or gain of the structure.  When the thermostat calls for heat, a full blast is delivered as though these requirements are on a design degree day.  This is wasteful in the shoulder mild seasons periods.  Delivering precise heat exchange for heat loss can save 20-30% reduced energy use.  This reduction of energy waste can make the renewable sources more efficient.