You may have performed a do-it-yourself home energy evaluation in an attempt to seal air leaks that allow valuable conditioned air to escape from your home. If you have: Congrats! An airtight home creates lower heating and cooling loads, resulting in lower energy bills year-round. DIY jobs, however, generally don’t offer the same results that a professional home energy evaluation can. Namely, a pro utilizes a blower door test, which is considered the best tool to comprehensively measure a home’s leakage and locate those areas where air is leaking.