A question for the HVAC guys or anyone that does not like to arrive to a cold cabin. I have a cabin with hydronic heating that is usually turn down to 50 degrees when I have to pull myself away. I was looking into some of the WiFi enabled thermostats so that I can turn up the heat and get things warmed up a little while I am on my 5 hour drive up. But I have two problems, first I have 5 zones so it would mean I would need to get 5 different thermostats to install and monitor. But the worst is the fact that they are all wired through the house on 2 wire thermostat wire and the WiFi models I have seen all require a constant power meaning I would have to re-wire each thermostat location with 3 or 4 wire cable. Does anyone know of a product that might allow for a more central controller with just remote thermometers at each zone location? I really just did not want to rewire the whole place.