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How does the thermostat control temperature? Am I crazy, I feel like I'm missing a section on how this device connects to the central air, Ac, heater, fan or something that can affect temperature. Under hardware: "relays to control the furnace and the fan." But I don't see details on the relay.

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You just wire the relays to the control wires coming out of the wall. You can turn your furnace on and off by just touching these wires together. It will depend on how your system is wired there can be a lot of variations. Of course making sure your product works with all those variations is one of the hard parts that they didn't address.

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