The existing Ecobee put in works by using the PEK for the reason that I feel there are only 4 or five wires going through the thermostat to your furnace but I'm able to fairly easily increase far more wires if needed to get two stages (thermostat is nearly directly https://tituskvbhm.dgbloggers.com/36220453/helping-the-others-realize-the-advantages-of-copyright-dosage