Patent ID: 7099748

Claim:
A method of controlling operation of a heating, ventilation, air conditioning and refrigeration (HVAC&R) device to bring an interior temperature for a structure to a predetermined temperature setting at a predetermined time each day, the method comprising the steps of: sensing a temperature both inside and outside a structure; calculating a preliminary recovery time for an HVAC&R device to drive the sensed temperature inside the structure to a predetermined temperature setting, the preliminary recovery time calculation being obtained by multiplying a difference between the sensed temperature inside the structure and the predetermined temperature setting by a previously calculated air treatment rate; calculating a correction factor based upon multiplying a predetermined value by a difference between the sensed outside temperature and a previously sensed outside temperature; calculating a corrected recovery time based on a sum of the calculated preliminary recovery time and the correction factor; determining a starting time by subtracting the corrected recovery time from a predetermined time; and initiating operation of the HVAC&R device at the starting time.