By Billy Draper.

Imagine this. You live in historic home built in 1916. At the end of your flagstaff walkway, pale grey banisters lead you up weathered stairs onto a wrap around porch. The front window is grand and welcomes early morning sunshine in as you drink your robust Columbian blend. However, your morning coffee isn’t agreeing with you. It’s not that the table cream has gone bad, it’s because you’re gazing at your $450 power bill. Sure your house has historic charm, but it’s modest. In fact, it’s barely 900 square feet. The copious amount of energy you’re using to light, heat and cool your quaint home could power a mansion that would swallow your house whole. This imaginary story is in fact true tale from a Home Energy Auditor, whom we’ll refer to as Blondie from here forward. Blondie explained the home was exchanging 220% of its air with the air outside, per hour. Even though that number is staggering, it’s seems a bit expected when you consider the house is nearly 100 years old. However, Blondie shared similar stories like this for homes built in nearly every decade since then, including our own 2000s.

Blondie shared average air change rate per hour (sorry for the mouthful) percentages by decade. They are as follows:…

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