Is it OK to use my air conditioner when the filter for the heater isn't clean?
I'm pretty sure I need to clean the filter in my plug-in air conditioner/heater since every time I use my heater lately it's been getting muggy and humid in the room and smells bad. But I don't know how to clean it and I'm only in my place for a short while longer. Is it OK to use the air conditioner when the heater seems to be broken like this?

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