Some of Our Sources:
- Which? (U.K.)
- Consumer Reports
- Choice (Australia)
- Sears.com
- Amazon.com
- Sensible Home
Energy Star Savings
GREG HOLCH, House & Home senior editor
To receive an Energy Star rating, a window air conditioner must reach a minimum EER (energy efficiency ratio) of 10.7. You can compare energy savings between models by calculating a 10 percent savings for each point difference of EER. An air conditioner rated at 10.7 EER will save 10 percent in energy costs over a 9.7 EER model. Since air conditioners with an Energy Star rating don't cost much more than non-rated models, experts say this one is a no-brainer.
Our Reviews
Advantages
- Most do a good job of cooling
- Relatively inexpensive
- Higher EER ratings save energy
Disadvantages
- Can be noisy
- Too small a unit won't cool well
- Too large a unit won't remove humidity well
Advantages
- One unit cools your whole house
- Can use existing ductwork
- Mini-split systems are a no-ductwork option
Disadvantages
- Require professional installation
- May require ductwork modifications
- Prices vary radically
Advantages
- Alternative to a window air conditioner
- Can be rolled from room to room
- Can supplement central air
Disadvantages
- Expensive
- Don't cool as well as window units
- Must vent air to outside
- Requires draining