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"See, Pilgrim, there's no Freon in this System"
Salesman: Mister, do you want an air conditioner for your wagon? It's very cheap!
John: What?? That'll never work, for a 10ft by 6ft wagon we'll need at least 18,000 BTUs, and that's only 6,000. What sort of greenhorn do you take me for? Correct unit capacity is critical to optimum efficiency. Under-sizing leads to poor operating efficiency. An undersized unit will operate longer and may not have the capacity to adequately cool the wagon to the desired temperature and may not dehumidify the wagon properly. Go get another one, amigo!