Source: http://www.acdoctor.com/cooling_calculator.php last access 10/27/08. Information regarding resources and how much you can save if you upgrade to a newer model conditioner.
So you are thinking about upgrading to a newer air conditioning or heating system because you keep hearing things about green this and save energy that?
How about seeing actual savings in the form of:
1. Money
2. Trees/Carbon emissions saved
and 3. Energy preserved.
Their calculator will also tell you how many years it will take for you to recover the initial cost of installation/upgrade. With all of your options (even you kw/h rate) weighed out for you, the decision becomes much easier.
Below is an example quote (using rough, estimates instead of actual numbers) for the air conditioning system that was installed in my home this last March.

This bottom chart shows what I could recover over the lifetime of the unit.

A pretty good way to make a decision if you ask me. Check it out.
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