Both the Seasonal Energy Efficiency Ratio (SEER) and the Energy Efficiency Ratio (EER) are used to rate the energy efficiency of an air conditioner. SEER is used to rate central air conditioners and EER is used to rate room air conditioners, so that’s the one you’ll want to pay attention to when replacing your window units.

Typically, room air conditioners with an EER of 10 or better are considered efficient. If you tend to use your air conditioners a lot in the summer time, you’ll definitely want an AC with EER of 10 or higher to ensure that you save as much as you can on your energy bills. Although ACs with higher EERs are initially more expensive, they will be more cost-effective in the long run. And with window air conditioners, you can easily get your moneys worth because you can take them with you if you move.

If you’re considered a low-income resident, you may qualify for a grant of up to $5,000 to help cover 50 percent of the cost of your new air conditioners through the NYSERDA Assisted Home Performance Grants. The grant also covers other energy efficiency measures such as added insulation and air sealing, which will also help you save money on your cooling costs.

Updated July 16, 2010