Economizer Savings Calculator
Estimate energy and cost savings from an HVAC economizer by comparing mechanical cooling hours to free-cooling hours.
Inputs
tons
hours
$/kWh
hours
ASHRAE 90.1 §6.5.1: economizer required >54,000 BTU/hr; hours: dry/cool climates 1,500–3,000 hr/yr; SE 500–800 hr
kW
Results
Annual Savings with Economizer
$1,440.00
Simple Payback Period
2.8 years
Annual Cooling Cost (No Economizer)$3,600.00
Annual kWh Saved12,000 kWh
How to Use This Calculator
- Enter System Cooling Capacity, Annual Cooling Hours, and Electric Rate.
- Set Economizer Hours and Compressor Power Draw.
- Review Annual Savings with Economizer ($) and Simple Payback Period (years).
- Use Annual Cooling Cost (No Economizer) ($) and Annual kWh Saved to inform your decision.
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