Current thermostat for a Ruud 2.5 ton heat pump is a broken Braeburn and will be replaced on Friday. It's downstairs, and the single return is upstairs. Does there exist a pair of thermostats that communicate wirelessly, with the downstairs stat wired in the usual manner and the upstairs stat either battery powered or line voltage. The idea being that the HO could choose which stat governs at any given time. Has anybody seen a reliable pair of this type?