"RBM" rbm2(remove wrote:

Don't know if there is a formula for this and I'm not looking for a typical
heat loss calculation. The scenario is this: Garage is 24' X 24' with 12'
ceiling. There is sheetrock and insulation in the ceiling and three walls.
The garage has two standard overhead doors. Temperature is aprox 32 degrees.
I want to raise the temperature to 60 degrees in about one hour. How many
BTU's do I need?

Anyone who has the numbers is going to need to know how cold it is
outside-- is it likely to get to 20 below or is 32 the coldest it gets
outside?

How much insulation and how many & what type of windows will also be
needed if this is even doable. Hey- while you're at it- are those
doors new, insulated doors, or 50 yr old aluminum shells?

All that said- I think you're going to want something in a kerosene,
gas or oil heater. My WAG would be something in the 50K BTU
range- that would be about 15000 watts- [62 amps of 240 if my memory
and math serve me]

Electricity has its advantages, but IMO, heating a space up in a hurry
isn't one of them. [though I will say I've never seen an electric
furnace in action- if you're in the TN Valley that might be worth
looking into]

Jim