I agree with oakman, it's likely the t-stat.
Jump the green and white wires together and see if the furnace runs and heats. If it does, then you can just replace it with a new one or you can install a programmable unit such as a Honeywell.
If you want more proof that it's the thermostat, you can jump the Green, Tan & Yellow together and the A/C should run on low.
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Salem 29RKSS Pushing a GMC Sierra 2500HD!
Gotta go campin!
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