Economizer Hours Analyzer

Calculate available free cooling hours and estimated energy savings for airside economizers at any of 202 TMY3 weather stations across the US. Economizer eligibility is determined by comparing outdoor air enthalpy to return air enthalpy per ASHRAE Fundamentals.

Select a location and supply air setpoint to see hourly, monthly, and annual breakdowns of economizer-available hours and cooling energy offset. Results include an enthalpy scatter plot showing each occupied hour and an enthalpy bin chart, all based on 8,760-hour TMY3 weather data.

Helpful for estimating economizer energy savings, evaluating economizer repair or replacement, and supporting ASHRAE 90.1 compliance documentation.