Hi, does anyone have experience with outside air defrost ice merchandisers(retail sales of bagged ice at gas stations and convenience stores) The unit uses an evaporator rather than cold wall. I have a customer that would like me to put together a system which can be used outside in low ambient conditions (Canada). Of course they would like it to be as economical (cheap) as possible. I have the condensing unit and evaporator which was specked by the manufacturer. Can you tell me the specific controls that are used for these units eg: head pressure control, crankcase heater, t'stat, defrost, etc. and where to get them.