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The DOE is phasing out AC units with SEER ratings that fall below 14 or 15. The exact minimum rating depends on your region. In the northern United States, new ACs must have a minimum SEER rating of 14, though you can still buy and install older systems as long as they were compliant when they were manufactured. In the southern and southwestern United States, you cannot buy or install older air conditioners with lower SEER ratings. The minimum rating is between 14.5 and 15, depending on the power of the unit.

There are several tell-tale signs that your AC coils need cleaning, including:

• You’re getting higher electricity bills.

• Your home doesn’t feel as cool as it usually does.

• Your AC unit is running longer than usual to cool your home.

• Your home is more humid than usual.

• The coil is covered in frost while running.

There are a few ways to determine if a vent is open or closed. You can inspect the vent and examine the position of the fins. If there are spaces between them, the vent is open. If the fins are flat and touching, the vent is closed. You can also stand under the vent when the system is running to see if you feel air flowing through it.

While most air conditioners can last between 10 and 20 years, they will only last this long (or longer) if properly taken care of. Routine maintenance and inspections help keep your AC unit running in tip-top shape but understanding what factors will decrease its lifespan will also help keep your unit running cool.

Some things that shorten your AC’s lifespan include:

• Extreme outdoor conditions, like high humidity or extensive salt spray 

• Improper installation

• Extended run times, either by the unit being too small or the thermostat setting too low

• Not performing required maintenance