House built in '99/00 by a large builder: No C wire. With that said, the Ecobee that I bought off eBay included the PEK. It required a few hours up in the at

House built in '99/00 by a large builder: No C wire. With that said, the Ecobee that I bought off eBay included the PEK. It required a few hours up in the attic but was easier than I thought it was going to be.