The chicken or the egg?

The chicken or the egg?

"What's the first best investment: upgrade the shell by sealing infil-exfiltration air leaks, adding insulation, installing new windows and doors, or replacing the heating and air conditioning equipment? You can only afford to do one or the other."

I'm sitting in a classroom taking the mandatory training class to be eligible to participate in the PA Keystone Help program that provides low-interest loans for folks to upgrade their home’s energy-efficiency. Most in attendance are insulation, general, window and door contractors. There are just a few mechanical contractors.

The instructor began by asking, "What's the first best investment: upgrade the shell by sealing infil-exfiltration air leaks, adding in

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