Window air conditioners
Window air conditioners are measured by a simpler calculation of 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.
View a sample window air conditioner EnergyGuide [PDF format]
The same sizing principle applies to window air conditioners - 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.
Other features to look for include:
- Sleep settings
- Filter alerts
- Remote controls
- Energy-saver options
- 24-hour timers
- Easy-clean filters
- Noise insulation
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.
When to buy
If you know your existing air conditioner is on its last legs, it pays to plan ahead for replacing it. Making an emergency decision on a new system during the middle of a heat wave can lead to bad energy choices.
Late winter or early spring is usually the best time to purchase a central air conditioning system – it’s the off-season for dealers, and many manufacturers offer significant rebates during this time of year.
End-of-summer clearance sales are a great time to purchase a window air conditioner – but the selection might be limited.
Don’t forget to ask about warranties, service contracts and maintenance requirements! |
