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I have a 22x20 shop with 9 foot ceilings off of an unheated garage. I would consider my insulation to be average at this point. I am planing on using a propane direct vent unit from Modine (Hot Dawg) or an Empire unit for heat. I have used 7 online BTU calculators and get estimates of 22K to 70K BTU, with most in the range of the mid 20Ks. I am looking for some guidance from people with real world experience. I live on the coast of Maine and plan to keep the shop at 45 duirng the nights with 3 or 4 days a week of full usage during the winter. Is is better to have somethign too big (say 45K BTU) rather than something that is just meeting the BTU estimates (say 30K BTU)? Any advice woudl be welcome.