Smoke has covered the Truckee Meadows for weeks, and that means smoke has been leaking into homes for that long as well.

"There is some smoke that's going to get in whether it's door crevices or anything like that," Rickey Hayes, Marketing Manager for Sierra Air, says.

Central air conditioners recirculate the air in the house, so if they home is well-sealed, there won't be a lot of particles that are let into the home and eventually captured by the air filter. Hayes says often times, A/C and furnace repairs are necessary because an  air filter wasn't changed.

"I hate to not give people the benefit of the doubt but it's nothing that's on the top of their mind," Hayes says. "You come home from working all day, the last thing you think about is a filter. Air conditioners and furnaces are like cars or anything else with moving parts, you have to do maintenance on them."

Hayes says air filter manufacturers normally recommend changing them every 90 days, but Hayes recommends doing it every 45 days, especially when it's this smoky. It may sound like it's unnecessary, but normal household air filters are only five or ten dollars, and serious repairs are much more.

"For us it's an 89 dollar diagnostic for our guys to come out there and take a look," Hayes says. "And then it's the cost of repairs at that point, and average repairs run about 350 dollars."

People who don't have central A/C often use A/C's that pull air from outside, like swamp coolers. If you have something like this with a filter, it's still not the best idea to turn it on and use it normally.

"Turn your fan to on, not auto," Hayes says. "And that way it's constantly circulating that air in there and cleans it out a little bit better."

Hayes says you can get away with it if you have other ways to filter the air.

"Or what you can do is look at stand alone room filter which run, good ones, about a thousand bucks," Hayes says. "But they will provide as good of service as our biggest filters."

The point is people already tend to slack when it comes to changing air filters in their homes, and that can lead to broken systems. This air quality only accelerates that process, so it's best just to take care of it.

"An ounce of prevention is a pound of cure." Hayes says.