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Is the quote worth it? Insulation and window payback

The quote, any rebate, your yearly bill and the saving the installer promises give the payback in years and the net result after 10 and 20 years.

Example values: replace with yoursWhere you liveSets the electricity price and the currencyQuote for the jobInsulation, windows or air sealing, as quoted$Rebates or tax credits you will actually receive$Your household's yearly energy bills, all fuelsENERGY STAR's typical US household bill, all fuels. The percent below applies to this whole bill, so enter the whole bill, not only heating.$Quick pick for the percent savedENERGY STAR says up to 10% of annual energy bills. Pick the installer's number below if you have one.Percent of the whole bill the job savesAsk the installer for their number and how they got it. If you do not have one, use the quick pick; the result also shows the payback at half the saving.%

Use it on the quote you have

The only number you cannot read off a document is the percent saved. Try the installer's figure, then half of it. If the payback at half is longer than you expect to own the home, the job is a comfort purchase more than a money one, which can still be a fine reason.

Worked examples with different quotes and percentages are on Is an insulation quote worth it?.