Cooling Load Hours
Colorado
Cooling
Load Hours is a number developed by the HVAC industry to indicate the number of
hours that a typical air conditioner would run at a given location. Use
the map below to obtain a rough idea of the cooling load hours in your
area. Then adjust the total by adding or subtracting from
information in the table below. The cooling load hours for Colorado
range from 350 in north central Colorado to close to 800 in extreme SW
Colorado. Other locations refer to map. To calculate the annual cost
of operation for an air conditioner, use the following formula where Btu/Hour is
the size of the unit, SEER is seasonal energy efficiency ration and $/Kwh is
your cost of electricity: (Btu/Hr
/ SEER) x (Cooling Load hrs / 1000 watts) x $/Kwh = Annual Cost of Operation
Adjustment 
Cooling
Load Hours 
Air conditioner is left on all summer. 
add 200 
Lots of west glass 
add 300 
House is well shaded 
subtract 100 
No west glass 
subtract 100 
House is unoccupied during the day and
AC is on setback to just come on in afternoon to cool house down 
subtract 200 
Use of whole house fan in evening 
subtract 200 
Over 8000 elevation 
You don't need AC 
