Good luck in your quest Dale
@snakeyes
I'm pretty much the opposite,
I need A/C in mine for 8-9 months a year
it's cold in the winter, but not unbearably cold "usually"
gets in the 40*s when it's 20*s outside
well insulated & insulate the door too, it helps
many are either propane (could be costly)
or natural gas fired (natural gas is way cheaper)
that's what they used in the dealerships too
best bang for the buck "out here"
electrical would be costly IMO
maybe a bunch of expensive solar panels & wind turbine,
might/could offset the costs
(expensive eco ****)
Radiated heat
(off a water-heater/
boiler/water vessel, your house 40 gal. HW heater
probably isn't efficient enough to do it)
isn't very efficient when doors are opened & closed often
also it takes a long time to heat, it's always there thou
it's not cheap either, copper & brass, plumbing/plumber cha $$$$$ ching
I know a couple guys that have an abundance of wood
& use an old wood stove, to heat theirs
it takes more room up that way, need a good 6' of clearance too
there's coal fired
& waste oil fired too, in areas that allow that stuff
Radiant heated floors are an option too,
that could get expensive
usually done prior to the garage floor pour
unless it in a cap of some sort, on-top of the concrete maybe
Floor coverings, something like Racedeck tiles, helps a little too
keep some of the cold off your body, a little insulation (not much)
I don't think I'm an expert, just experienced
attempting to help a bud, with a little info...
a few things to think about
I'd guess the budget or ongoing costs, long term
is a huge deciding factor
good luck