Well you need a meter in the loop here so you'll probably have to run it from the house as I assume it's next to that. When I trenched gas for the garage I believe it they were able to T right after the meter and not perf the house envelope.
Honestly trenching wasn't that expensive - unless you have a deck or poured concrete above it - it's just about someone hand bombing it. (bonus if you can get machinery in there to help)
Honestly once you get forced air gas heat - the garage is comfy. I can flip it on from its 3 degree setting to 20 and have it toasty in like 8 minutes. The only other things I can think about are to focus on insulation and air leaks:
- consider the insulative abilities of your garage door. If it's a wooden one from the 80's it'll leak like hell
- make sure the seals all around the garage are as tight as possible
- ditto for the man door
- You'll need a special low temp thermostat if you want to set it at 3 C
- good lighting will make you think it's warmer
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