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I just bought an older home.

The furnace, A/C, and windows are functional, but I suspect there may be some efficiency gains to be made.

Is there any way to determine/estimate how efficient those are currently? I would like to see if it makes sense to spend the money to upgrade them based on ROI on my utility bills.

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this question is far too broad as it stands. The only answer to the question as you posed it is "hire someone to do an energy efficiency audit" – mac Sep 19 '13 at 19:23
@mac: Does an "energy efficiency audit" require expensive, specialized tools? If not, I see no reason why he couldn't do that himself. – BlueRaja - Danny Pflughoeft Sep 19 '13 at 20:15
As far as I am concerned an energy audit is a good answer - I am aware that the question is broad. I honestly did not know whether the task of estimating energy consumption of a home was something that could be done with any sort of accuracy. – javanix Sep 19 '13 at 20:59
@BlueRaja-DannyPflughoeft A blower door is a couple grand, an infrared camera is another couple grand. So for a cool ~$4000.00 you can do your own energy audit, but you'd better find some big problems if you want to save $4,000.00 on your energy bills. – Tester101 Sep 20 '13 at 10:17
up vote 2 down vote accepted

As mac has mentioned, an energy audit is a logical starting point. I would shop for a "blower door" test that measures actual system air leakage. The other test would be a thermal IR scan, that will reveal relative hot/cold spots. Some utilities offer discounted audits.

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