I have an all electric air handler/furnace connected to a separate AC unit and it is also a heat pump. I've purchased the latest and greatest Honeywell WiFi "Smart" Thermostat and it needs a C wire. Because the furnace is all electric (not gas, etc.), Honeywell told me it's either not compatible or I'd need to hire a technician to determine.
Following are pictures which show the current thermostate wiring, furnace model #, terminal wiring and wiring diagram (it's a furnace from 1989, so please forgive any lack of clarity on the diagram).
I've read the other posts about the C wire, but am unable to determine from those if the B would work in my situation as a replacement for the C. I already have an extra Blue wire wired to B and am hoping I can use that for the C wire, but I don't want to damage anything and was concerned from some other reading that it may be for the heat pump.
Higher resolution picture of wiring diagram: http://i.imgur.com/68bhMjn.jpg
Any help would be greatly appreciated!