We never had a filter on any of our propane heaters on our other rv's (TT's). I suspect because the only problem would be dirt build-up on the blower fan, which takes quite awhile to cause a problem. Most small electric or gas heaters do not have filters on them either.
Air conditioners on the other hand do require a filter. When the evaporator coil get cold it gets wet (removing water from the air). Without a filter, it would very soon get clogged up by the dust in the air sticking to it.
When you run your basement air in the heat pump mode the filter is really only cleaning the air inside the MH. The outdoor fan & coil have no filter. Of course it is easier to clean the outdoor coil with a water hose. The outdoor fan though has no filter.
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Dan & Sharon & Kasey (Our Yorkie Puppy (12 Yrs Old) On the Road (2012 Journey 36M, 2006 Jeep Liberty)
USN-Ret ('65-'93) Fulltimers, Class of 2012
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