Thermal imaging is an essential tool for anyone involved with home weatherization. This paper covers how infrared is utilized to inspect residential homes for heat loss and gain, outlining how crews can use it during the audit, while at the job site and for quality assurance. Also covered is how infrared, when used with a blower door, can provide home performance professionals with a comprehensive assessment of a building’s thermal performance, allowing them to work more efficiently and effectively. Featured too is information on what type of thermal imager one should consider for this field and the specifications to consider when purchasing a system.