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I have a Coleman Heat/A/C combo with natural gas. I would like to install a programmable thermostat. The only thing that throws me is that there is a A/C / Heat switch on the furnace that controls which system you wish to use. I assume that I would still have to switch the furnace switch every season or is there a way to bypass it and use a off the shelf thermostat?

Hi Steve,

You can replace 2 wire a/c control box with a 4 wire a/c control box.



Thanks,
Robert