[wally_bert]

Thank you for the advice.

[fso301]

Thank you for the advice.

Worked for us. Saved thousands of dollars.

Actually, you want the lowest temp from the different thermometers to be about 130F. That provides a margin so that nooks and crannies of baseboards, AC register boxes, etc make it to 120F.

Household electronics seem to be ok. We never lost anything but we did lose a couple of cheap thrift store box fans in the heated rooms. Make sure you uses fans to circulate the heated air in the room.

[fso301]

Obviously you don't want the household HVAC system running while you are heating the rooms.

And put a bedbug free towel under the door(s) of the room being heated.

If your children are picking them up at school, or from friends houses and bringing them into yours, you have a problem that may not be completely solvable, only managed.