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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
    Commented Sep 19, 2013 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. Commented Sep 19, 2013 at 20:15
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    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
    Commented Sep 19, 2013 at 20:59
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    @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
    Commented Sep 20, 2013 at 10:17

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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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