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are you planning on only running it when your in the shop or all the time? if you want something that will heat the shop when you walk in in the morning and turn it on after sitting all night cold id say atleast 250k btu/hr. if your gonna leave it on a thermostat 24/7 you should be alright with...

modern refrigeration and air conditioning is the industry standard for everything hvac. covers residential systems commerical systems, ice machines, refrigerators freezers. most schools use this book, i am a refrigeration specialist in the army and i have this book in my toolbox it really is...