Location of secondary filters on Fujitsu mini-split heat pump

A picture’s worth a thousand words…

Front cover Fujitsu RLS Heat Pump


Flip cover open to reveal filters


Lift primary filter to expose small secondary filters


One filter under left and another under right

One filter under left and another under right




Air filters – time for a spring cleaning?

Time to check your air filters! This filter was blue when new.

It’s been a long winter for many of us, and that means the furnace has run a lot! The more it runs, the dirtier your air filter gets.

There’s a ton of information on the web about air filters, MERV ratings, and so on, so I’m not going to repeat that. I’ll give you some links at the end of the article. I’ll discuss the adverse effects that a dirty or improperly installed air filter actually has on your system’s efficiency and potentially, your health.

The old saying that you should check your air filter once a month isn’t accurate. It depends on the type of air filter, how clean you keep your house and how long the system actually runs. The main thing is, if you haven’t checked your air filter in a while, do it now!

A dirty air filter compromises your heating/air conditioning system more than you think. The dirt restricts the air flow through the system. In some cases, this can increase the power draw from the blower. In other cases, it just diminishes the amount of air that comes out your vents. In either case, a dirty air filter equals lower efficiency.

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