It always pays to do your homework before investing in energy-efficient equipment such as ENERGY STAR qualified products. What products and equipment really work? How much will it cost to install? Where do you find the money? How quickly will you recover your investment? There are many resources to help you get the answers that will work for your congregation.
Another consideration in funding energy-efficiency upgrades is the price of the equipment. Why pay more than you must for efficient products and equipment? Perhaps your congregational organization or association would sponsor a group purchase in which you and other facilities pool your buying power for volume discounts. Read more about this strategy to stretch your investment capital in ENERGY STAR Small Business's Group Purchasing Fact Sheet (159KB).
The two most common financial evaluation tools are simple payback and internal rate of return (IRR).