Patent ID: 8382003

Claim:
A method for effecting cooperation between a modulating air conditioning system and a two-stage thermostat for satisfying an air conditioning load demand in a conditioned space; the method comprising: producing a first call signal, based on at least one previous operating cycle of said modulating air conditioning system, from said two-stage thermostat indicating a first stage operation of said modulating air conditioning system; an output capacity of said first stage operation being determined by an average of a value of power used in said at least one previous operating cycle; and producing a second call signal from said two-stage thermostat when said first call signal is not produced, indicating a second stage operation of said modulating air conditioning system, an output capacity of said second stage operation being greater than said output capacity of said first stage operation, and wherein said average of a value of said power is calculated by a sum of a percentage of said power used during a first time interval in said first stage and a percentage of said power used during a second time interval in said second stage.