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How Much Does It Make Sense to Invest in New Windows

How much you will save in energy costs per year (estimate by using RESFEN calculator at http://windows.lbl.gov) $
How much value you put on the pleasure you will get per year from the better appearance and comfort window improvements will provide (perhaps think about this by comparing to the pleasure and cost of dinners out, cable tv service, new clothes, tickets to your favorite types of entertainment, or other pleasures) $
How much you think the new windows would add to the value of your house if you sold it today $
What you think will be the inflation rate?
Energy cost inflation rate
Home price inflation rate
General inflation rate
What interest rate you can earn in a safe long-term investment today (after taxes)
How many years you expect to keep your house
How much it makes sense to invest in windows $7,369
Note: Assumes the windows don't decline in energy performance, comfort, or appearance during the time you own your house.