I did the digital t-stat mod, and it works great on the AC. Since I removed the propane furnace, I want to harness the t-stat output to control a 110v dedicated outlet for a couple of space heaters. Should be relatively easy to accomplish with a relay, BUT I can't seem to isolate the outputs for HEAT on the stat. I know the white wire is for heat, but relative to what other wire? I cycled the heat on & off (could hear the stat's relay clicking), but I found no change relative to any other terminal using my autoranging DMM. I expected to find a NO or NC change with heat on/off relative to the common terminal. There was no apparent activity from the white wire at all. This shouldn't be that complicated.