Window Air Conditioners

Window air conditioners are measured by a simple calculation called EER, or energy efficiency ratio. A new window unit with an EER of 9.5 or more is considered efficient.

Keep in mind that the EER can vary greatly between models, so be sure to read the EnergyGuide label carefully before purchasing. The EER is the largest number printed on the label; you can also check the annual operating costs and how it compares to other brands.

Other features to look for include:

• Sleep settings
• Filter alerts
• Remote controls
• Energy-saver options
• 24-hour timers
• Easy-clean filters
• Noise insulation

When choosing the size of your new window air conditioner, keep in mind that smaller is actually better. Don't let a salesperson talk you into buying a larger unit than you need. Check the package to see how many square feet of living space the unit is designed to cool.

Window air conditioners should also be installed in a shady area – placing one on the south or sunny side of the house will make it work harder than necessary.