How to replace your air conditioner
What are my savings?
If you're on the fence about whether to repair or replace, calculating your energy savings can help you make the call. Same thing if you're waffling between a conventional or Energy Star unit.
So how to make that call? Energy Star has a calculator to help you out. Follow the "Savings Calculator (Excel)" link on the right side of the page.
The calculator takes into account where you live, the type of unit you have and your electricity rate (you can find that on your electric bill) to determine both your current annual- and life-cycle costs and what you'd spend if you replaced your unit.
It'll even let you know how long it'll take for the unit to pay for itself through savings in your electricity bill.
If you're still unsure, check with Energy Star to see what rebates are available where you live. You also can ask your utility company if it has rebate offers.