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This has much to do with how the air conditioner and the heater is vented. If the air conditioner draws its air from outside it could be picking up air / smell of smoke from the other family and then redistributing it into your home. A heater on the other had usually has a heater input vent within the house it is heating (it draws the interior air in and then heats it blowing it back out) as the air within the home will be significantly warmer than the exterior air.
Of course, set the heater/air conditioner temperature control to cold.
Because it's not a heater.
The air conditioner or heater continually runs.
windows painting house,new air conditioner new hot water heater
the answer is air conditioner
no
Inside the heater/ac unit close to the main unit.
It's obvious that you have problems with wiring. I would start from the heater/AC control panel.
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safehow like the house blows up or something no i thinks its safe and nothing going to break or explode