Hi, Last fall my father in law and I replaced an old manual Honeywell thermostat (round,bronze) with a new programmable Honeywell. The old thermostat was working fine but was in the lower level and we wanted a programmable on on the main level. At the time we hooked it up we tested the heat and the furnace was working. He did mention that as something within the new thermostat needed to be jumped and he was not sure if that was done correctly he questioned whether or not the AC would work come summer. Well,summers here and it won't come on. Rather than delve into getting the new thermostat to work I decided to just reconnect the old stat. We had left all the wiring in place. I hooked up the W,Y,R,G wire to the corresponding terminals and it doesn't work. Don't know why. We currently have a vertical strip with (from top to bottom) W,Y,R,G,C terminals. I believe only the WYRG were hooked up with the old one and that's all we hooked up with the new one. There is a wire coming from the other side which has a Red wire connected to the Y terminal and a White wire connected to the C terminal. I'm not sure where they come from or what they do. Do they come in from the AC unit outside perhaps. I realize this was a lot to digest. Any thoughts or theories will be greatly appreciated. Thanks! Vance

Several people I know have had them installed for a reasonable cost and say they work well. Being in Florida mold is a big concern any advice, comments or help on this subject will be greatly appreciated. I am a former Commercial AC Tech from a by gone era 1970 so my knowledge is profoundly out of date. Tom