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My house has a gas furnace and heat pump (and AC). Unfortunately, one bedroom does not have air ducts hooked up. Is there a way I could install a baseboard heater in that bedroom and have it controlled by the same thermostat that controls the furnace and heat pump? The answer could be wired as 1 zone or 2.

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    That doesn't seem like a good idea to me. Not only would it be more complicated to do -- involving relays and more wiring -- than a thermostat in the room, but it wouldn't work as well either. Unless the baseboard heater heats the room at exactly the same speed as the furnace/heat pump heats the rest of the house (hint: it won't -- especially with no air flow) you'll end up with a room that is either too cold or too hot most of the time. – gregmac Jan 19 '17 at 7:14
  • One relay, commodity device, not too hard. You're right, sizing will be a trick. Could "test it out" by initially switching a 120V outlet, and plugging portable heaters in there til you found the right wattage. – Harper Jan 19 '17 at 9:54
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    When you're wiring in that baseboard heater, why not add its own thermostat? – Daniel Griscom Jan 19 '17 at 12:06
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    @Harper It's not the relay way is "hard", it's just more work than a stand-alone thermostat (especially a wireless one), it's more complex (more things to go wrong), more expensive (relay, additional wiring) and it will not be as good (as far as room temp is concerned). All downsides, no upsides. – gregmac Jan 19 '17 at 15:42
  • To add to the reasons not to do so, consider where the thermostat is physically located. It's not in the bedroom so it'll never get the temperature correct there. BTW, the root cause solution is to run ducting to that bedroom. Slightly more work and cost :-) – Carl Witthoft Jan 19 '17 at 18:52

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