Question, are you sure you have a rear furnace.
My thermostat in the rear says furnace, however my unit does not have a rear furnace. The duct work from the main furnace runs through out. I did replace the floor dampers with adjustable units.
My overhead AC units have heat strips in them and work until temps reach around 40 -45 degrees.
Bill
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Bill M
2012 Georgetown XL 360
2011 Chevy Equinox - 2006 Chevy Avalanche
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