Sizing Your Cooler

Chart below is a "Rule of Thumb" Guide Only
Not a Substitute For an Engineered Calculation
When in doubt, always choose one size larger

If CFM falls between models, choose the larger model

Interior Heat Load:
High means places with unusual heat sources from hot equipment or processes, crowded conditions, etc.
Normal means no unusual heat sources - typical home or office.
Exterior heat Load:
Exposed means walls, roof exposed to sun, poor insulation, etc.
Insulated means walls and roof well insulated and/or shaded.

EXAMPLE
A house in Phoenix AZ, 40 feet long by 30 feet wide with 8-foot ceiling. Insulated, no unusual heat sources.

30 x 40 x 8 = 9,600 cubic feet
Zone: 2
Minutes per Air Change: 2
9,600 / 2 = 4,800 CFM

A 4800 CFM Cooler model is indicated.