This Has saved me on both propane and electricity and I love it. My upstairs has a lower end model, it's just my bedroom and it's on a fairly fixed program that really only changes when we go on vacation. The rest of the house is on this. This is programmable for 7 days, which makes it simple to keep the house a little colder on work days when no one is home. Setting the temp is easy, you just choose what you want it to be and when and the thermostat figures out when to start working toward the new temp.
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The Wifi feature is very cool. When we go on vacation in the summer and shut off the Air conditioning, it allows us to turn it back on when we are thirty minutes from home from the smartphone. Sometimes we even change it from the couch that way, but not because we're lazy (of course) the interface is just simpler on the smartphone app. The perfect blend of comfort and savings. It also allows us to check on things when away, it's a handy and cheap way to tell when I'm at work and the weather is bad if my power is on or out. Overall after doing my homework I would say this thermostat is an excellent value and has paid for itself many times over.