Wall Heat Gain Calculator

Calculate heat gain through exterior walls using U-factor and temperature difference. Includes solar heat gain effects.

Net wall area (excluding windows).
ft²
Overall heat transfer coefficient of wall assembly.
BTU/hr·ft²·°F
Design outdoor dry bulb temperature.
°F
Design indoor temperature.
°F
Solar heat gain for wall orientation (0-20 BTU/hr·ft²).
BTU/hr·ft²

Results

Conductive Heat Gain-BTU/hr
Solar Heat Gain-BTU/hr
Total Heat Gain-BTU/hr
Cooling Load-tons
References: ASHRAE Fundamentals Chapter 18: Nonresidential Cooling and Heating Load Calculations; ASHRAE Standard 90.1