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Economizer Savings Calculator

Calculate free cooling hours and energy savings from outdoor air economizers.

Location & Climate

System Parameters

Operating Schedule

Energy Costs

Economizer Types

TypeControlBest For
Dry BulbTemp onlyDry climates
EnthalpyTemp + RHHumid climates
DifferentialOA vs RAAll climates

Code Requirements

ASHRAE 90.1: Required for systems >=54,000 BTU/hr in most climate zones

Title 24: Required for California commercial buildings

High Limit: 75F dry bulb or 28 BTU/lb enthalpy typical