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labman, thanks for the help!

The new thermostat is one of the newer Honeywell models, and I'm almost certain it handles a heat pump.

The wireless idea sounds promising. I'm sure I could return...

Right now I have two separate thermostats, one obviously controlling the A/C (heat pump), and the other controlling a gas furnace. To save money, I've upgraded the heat thermostat to a programmable...

After some additional tinkering around, I was able to figure out the issue. The green wire needed to go in the W slot. I thought I had already tried that based on some previous advice here, but maybe...

I'm upgrading from an "unknown" older analog thermostat to a Honeywell RTH7400 programmable for our heat. The old thermostat had only two wires hooked up, red and green. This must be a single stage...