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air to air heat pump and lp furnace back up ---i only want the lp to come on if it gets real cold out and if the heat pump wont keep up --what is the best way to do this ? :001_unsure: thank you
 

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The Honeywell TH8321 with the optional outdoor sensor can do this.





The section above the highlighted area would apply...



The section above the highlighted area would apply...
 

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The IAQ. And since the EIM is mounted/installed at the furnace, you don't hear any clicks at the thermostat like you would with the 8000 series.
 
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