Patent ID: 8738185

Claim:
A method of controlling operation of an air handler provided in an HVAC system, comprising: determining a standard volume airflow rate corresponding to a volume of air flowing through the HVAC system before altitude correction, the volume of air based upon possible elevations at which the HVAC system is installed; determining a set of altitude factors associated with a set of the possible elevations at which the HVAC system is installed, the set of altitude factors selected based on at least one of a BTU content of natural gas used in the HVAC system and a furnace type, the set of altitude factors being less than one for elevations above two thousand feet; modifying the standard volume airflow rate by a selected one of the set of altitude factors to obtain an altitude adjusted volume airflow rate, the adjusted volume airflow rate obtained by multiplying the standard volume airflow rate by the selected one of the set of altitude factors; generating an air handler control signal based on the altitude adjusted volume airflow rate; and communicating the air handler control signal to the air handler.