Here's your filtration solution. Read the part about it's comparison to expensive units before you laugh.
I'm becoming more and more a fan of low tech. Where I am, we use the air conditioner rarely (actually, it's an air source heat pump so is used in winter). But with son, DIL, and (most important) grandkids coming in a week, I thought I'd check it out. Turned the thermostat down, set to "cool", and went to run a bunch of errands. Come back a few hours later and it's 92 inside - it was 79 when I left. My initial thought was fire - but no smoke and no alarm. Turns out the "cool" setting was turning on the furnace. Powered it all down and restarted; same thing. So must be an electronic glitch somewhere.
I think I can jumper the thermostat wires for cooling and isolate whether the issue is in the thermostat (unlikely) or furnace controls.
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