Ventilation Energy Cost Calculator

Estimate annual energy cost for heating and cooling outdoor ventilation air based on climate and system type.

Continuous outdoor air ventilation rate.
CFM
Annual HDD base 65°F (3000-7000 typical).
HDD
Annual CDD base 65°F (500-2500 typical).
CDD
System efficiency (0.8 for 80% furnace, 0.95 for condensing).
Energy Efficiency Ratio (8-14 typical).
BTU/Wh
Cost per therm of natural gas.
$/therm
Cost per kWh.
$/kWh

Results

Annual Heating BTUs-MBTU
Annual Cooling BTUs-MBTU
Annual Heating Cost-$
Annual Cooling Cost-$
Total Annual Energy Cost-$
References: ASHRAE Fundamentals Chapter 19: Energy Estimating Methods; ASHRAE Standard 90.1: Energy Standard