So I just hooked one of these up today , and I didn ' t need the PEK I didn ' t have a C wire but I had extra wires in the run and I just hooked one up to the 24 V transformer , creating a C Wire but from the directions it looked like the PEK just went inline with the existing wiring . The manual has you do this at the furnace but from what I saw I don ' t see any reason why you couldn ' t do it at the thermostat instead . Again , I didn ' t actually use it so it was a bit of a cursory glance , so I ' d recommend looking into it yourself . <| sep |> I mean , he might have been unarmed , but that isn ' t really the same thing . <| sep |> Doesn ' t it warn you when you choose to build a Power Construct Zygarde that it won ' t be able to be disassembled ?