The current Ecobee install works by using the PEK because I do think there are only 4 or five wires heading within the thermostat to your furnace but I can pretty effortlessly add more wires if needed to get two stages (thermostat is sort of instantly earlier mentioned the furnace https://judahaioug.thechapblog.com/34795013/an-unbiased-view-of-copyright-reviews