To get your OD design temperature, choose the city closest to your home

Below are ASRAE charts offering OD design temperatures, You may find more accurate information for rural areas not listed below.

Here is a list of cooling and heating design temps by State and County

Disclaimer: The information found on this website is for informational purposes only. All preventive maintenance, service, installations should be reviewed on a per job situation. Any work performed on your heating system should be performed by qualified and experienced personnel only. Comfort-Calc or it's personnel accepts no responsibility for improper information, application, damage to property or bodily injury from applied information found on this website as it should be reviewed by a professional.