Variable Differential Variable Delay Thermostat

摘要

A method for providing a cooling or heating variable fan-off delay based on a Conditioned Space Temperature (CST) measured during a current variable fan-off delay period compared to CST values measured during the current variable fan-off delay period. The method may also include turning off a cooling or heating system and continuing to operate an HVAC fan until the CST reaches an Inflection Point (IP) where a rate of change of the CST with respect to time (dT/dt) equals zero plus or minus a confidence interval tolerance. The method may also include providing a cooling or heating variable differential (or offset) and/or variable fan-off delay based on the duration of the thermostat call for cooling or heating, an off cycle time, a cooling temperature split, a heating temperature rise, outdoor air temperature, supply air temperature or a rate of change with respect to time of any of these HVAC parameters.