Ultimately any system, especially a home, is only as efficient as its weakest link. In millions of suburban homes that weakest link is right above the dozens of recessed lighting fixtures. The untreated recessed light fixtures create channels that encourage temperature/energy transfer at exactly the one spot you don't want any energy transfer! To achieve a truly efficient home, the entire system must be accounted for. This is what CanCoverIt does; it fixes the biggest inefficiency in the system.