Does anyone know of a good site out there that will calculate what it will save you in energy consumption to say upgrade from a 10 year old refrigerator to a brand new one?  Or, even better, upgrading from a 10 SEER A/C to a 14 or 16?  I know that I have questions about the length of time that these improvements take to pay off and I imagine that my clients are wondering the same thing currently.

With gas and oil prices skyrocketing everyone is interested in saving money and helping the environment.  Good sources of information would be appreciated!