By the looks of that insulation you will be able to heat that shop with a candle!! I don't know why anyone would do it any different. I have about 10k worth of spray foam in my new house and its crazy how efficient it is. I even air conditioned the garage with a mini-split (great for getting the humidity out) at 70 degrees and it costs me about 20 bucks a month. Worth every penny!! Hope you are living there soon. Camper life has to be getting old!!
