Β Air conditioner is installed. Ron Medvescek / Arizona Daily Star

Q: I have a 4-year-old, high-quality air conditioner, and it’s almost impossible to cool down my home to 74 degrees. It seems to take forever. What could be wrong?

A:Β You probably should have a company other than the one that installed your original unit come out to verify that everything was sized correctly for the square footage of your home. In most situations, we find that air-conditioning units are oversized. But in your case, it could be that your unit is too small.

For more do-it-yourself tips, go to rosieonthehouse.com


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