Best tstat for dual zone dual fuel system

Old 09-08-16, 06:07 AM
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Best tstat for dual zone dual fuel system

I am looking to replace a broken tstat in my system. I might replace both to match, if it is beneficial. My system is a dual fuel system. It has an American Standard 4A6H7 Platinum XM Heat Pump and an American Standard Gold Series Variable Speed Propane Furnace. It is split into two zones. Everything is controlled by a Honeywell HZ432 TrueZONE control board. Currently, I have one functioning Lyric Thermostat and one broken Hallowell.

I have had a bunch of issues with this system, because of poor wiring and non-ideal tstats. For example, I remember there being some issue with the lyric because it couldn't support a 2 stage heat pump and a 2 stage furnace backup, so one of the two functions had to be set to a timer switchover in the control board.

The tstats I am currently looking at are: the ecobee3, the nest, and the Honeywell Wi-Fi smart thermostat (RTH9580). The remote accessibility and communication between the smart thermostats is appealing. The price of the Honeywell is more appealing, but perhaps it's all gimmicky and only some old fashioned tstats are necessary.

Suggestions are appreciated!
Old 09-09-16, 06:12 AM
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While the Honeywell Prestige IAQ will support a 2 stage heat pump with a 2 stage gas furnace in a dual fuel application, I recommend controlling stages with percentage of zones demanding operation.

The Prestige IAQ also has Delta tee display and data logging. It would however require a separate internet gateway if you want it to alert your phone when performance is below your specs.

I would not want to see a single zone cause high speed demand of the equipment.

Of the choices that you listed I would pick the Lyric.

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