My brew room is cooling off this time of year when the furnace isn't running too often. Temperature was dropping from 68°F ambient to 66°F. I have one fermentor kept warm with the STC-1000 controlling an aquarium heater. I added a toggle switch to reestablish the jumper on the hot side of the outlet to be able to operate two aquarium heaters at the same time. Will work well when I want the fermentation temperature to be the same for both fermentors.
I disconnected the cooling wires to avoid burning out these relays when powering two heaters. Maybe another toggle switch to reestablish the connection to the cooling relay without having to open the case and manually reconnect the wires.