Problem with most electric heaters is they mainly radiate hear to objects not warm the air. I use this heater.
https://www.amazon.com/gp/aw/d/B0000...acL&ref=plSrch
Does a much better job but it still needs some help. Use the furnace and get it up to temp then the heater does a pretty good job maintaining it. I used on in my 33' class a in 5 degree weather and it kept it in the 60's.I will run it in the very cold months in Chicago because extreme cold is rough on things. I try to keep it above freezing.
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