I have a commercial building with about five thermostats for heating. They are of the non-smart variety, maintaining the same temperature regardless of time of day, with only a pair of 24v contacts leading to them.
Given that it is a 10,000 square foot building, this is costing me a lot of money spent on unnecessary heating during nighttime.
During the day, I want the temp to be 47 degrees, and at night, I would be happy with 38 degrees or so.
Do programmable thermostats need a separate power supply, or can they run themselves from just a pair of 24v wires that they open and close?
In other words, if I buy and install programmable thermostats, will I have to run any additional wiring?
Thanks i