by Mark Hansberger on April 17, 2018May 8, 2018 Money Matters: How Pet Doors Affect Energy Efficiency Pet owners appreciate the freedom that pet doors offer, but for all their convenience and benefits, they’re not always energy efficient. While the ability of the door flap has to resist heat transfer, the greater […]Read More Filed Under: Energy Efficiency Tagged With: energy efficiency– hvac system– pet doors– pet owners– pets