GoKawiilStudy finds US heat pump installers often overestimate home heat loss
A Purdue University study led by Kevin Kircher examined heat loss calculations given to about 75 US homeowners and found they frequently overestimated design heat loads by a factor of two or more, leading to oversized systems. Some homeowners reported paying over $1,000, and in one case $2,500, just for the heat loss survey. Industry figures also warn that AI chatbots are spreading unreliable advice on heat pump sizing, prompting companies like Cool Calc to plan improved AI integration.