I would say that a home energy audit is the most important thing you could do, even if you have to pay out of pocket for it. FWIW, I spent $600.00 to have an audit and because of that, I added a bit of extra insulation in my attic and put in a 2 ton HVAC system instead of the HVAC "experts" suggested 3.5 to 4.0 ton unit. {I had 4 quotes, 3 = 3.5 ton, 1 = 4.0 ton using "the rule of thumb" as nobody would do a Manual J}
The $600.00 was saved in the cost of the new unit, plus I found out where the couple of minor improvements needed to be made. Some of what I planned to do turned out to be non-issues.
Good luck with whatever your plans are for making your home more energy efficient. In most cases, lowering your utility bills through efficiency comes with the REAL benefit of a more comfortable home to live in.
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