That's clever. So you're using the fact the STC will engage the usually open "cooling" relay, which shorts out the sensor, triggering an alarm... That's neat.
It's a neat workaround if not using the cooling circuit as the STC's built in buzzer isn't usable for out of range, only sensor faults (like shorts, your trick exploits).@HK_Fuey
Why did you make it with two separate lines for heaters? You can get those double sockets, so only ran one hot wire to the double socket?
Mine is a bit different, I've got one plug on each, like yours, but one is hot, one is cool. My fans on the cool side, tit heater on the hot side. I suppose I could use a double plug if I wanted two heaters.