Does your air conditioner need a repair, replacement, or just a new filter? Whether your home is hot, has a musty smell, or air barely trickles out of the vents, take a look at what you need to know about AC repair, indoor air quality, efficiency, and filtration.

When Did You Last Change the Filter?

A central air conditioner has an average lifespan of between seven and 15 years, according to the International Association of Certified Home Inspectors (InterNACHI). But the filter inside won't last for the same amount of time.

The air filter catches particles before they enter your AC system or your home. This reduces the constant re-circulation of allergens or indoor pollutants, such as pet dander, microorganisms, dust, pollen, smoke, or cleaning chemicals. While there's no set schedule for all filter changes, you should check your system at least once per month.

If you've never changed the filter or can't remember the last time you did, now is the time to remove and inspect it. Some filters (such as electrostatic filters) are reusable. Instead of a replacement, you'll need to clean the filter. But if you don't have a reusable filter, you'll need to buy a new one now.

What Does the Air Filter Have to Do with AC Repairs?

A clean air filter helps your home's system to work at peak performance. Clogs and buildup force your air conditioner to work harder. This can lead to premature breakdown or excessive wear and tear.

Beyond the potential problems a dirty filter can cause, some filter-related issues can masquerade as larger systemic problems. If your home has an odd odor (when the AC is on), air barely trickles from the vents, or your home doesn't cool effectively, check the filter first. A blocked filter can cause these, and other, issues.

Should You Call a Contractor for Filter-Related Issues?

There's no easy or universal answer to this question. A basic filter change or cleaning doesn't require professional attention. But if your filter constantly clogs, you don't know how to change it, you're not sure which filter is right for your air conditioner, or you suspect the system has another problem, you need professional help.

An HVAC contractor can inspect the filter — and the rest of the system. If there's a more serious issue at fault, the contractor can recommend a repair or a replacement. This will get your AC system back on track and keep the indoor air both cool and clean.

For more information on AC repair and filters, contact a local HVAC technician.