"Bill" wrote in message

The only thing you are overlooking is the Btu output. In my garage, it
would raise the temperature about 1 degree.

1500 W = 5100 BTU

I use a 35,000 BTU propane heater and if it is very cold I still cannot
get it to a working temperature. Given the cost of electricity in my
area, that comes out to about $1.15 an hour if I had enough power to run
electric heat.


Well, what do you mean by "very cold"? Considering how few days it is
very cold
in central IN, I can do something else on those days. About how much do
you pay per
kWh in your neck of the woods?

Bill

I can get a 30 degree rise. That means much below 30, the shop is cold. At
10F, the shop will reach 40F.
Electric in my area is about 19¢.