Double-paned or low-E windows Insulation Heating / Cooling / Climate control Efficient or Energy Star appliances When considering a green improvement, especially a larger investment such as window replacement, calculate the "payback period" to determine if the savings justify the expense based on your own personal criteria. The payback period is the total cost of an improvement divided by the estimated cost savings per year.
"One of the best things about green improvements is that many of them will pay back through increased energy efficiency." - Green Your Home
Going GREEN? Here are the TOP Four Features! 
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