High Tunnel and Greenhouse Heating and Cooling Calculator

This calculator uses typical historical weather for your location to determine the heating degree days (HDD) and cooling degree days (CDD). It also uses dimensions and covering information about your tunnel to determine the heater sizing, fuel use, cooling requirements and cooling unit electricity use.

Start Month (#): Start Day (#): End Month (#): End Day (#):
Base Temperatures:
For Heating (F): For Cooling (F):
Tunnel Cover:
Tunnel Dimensions:
Width (ft): Length (ft):
Fuel and Heater (optional):

Fuel Cost (entered just as $ (per units above)):

Heater Efficiency (%):