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    The FM21 is a fossil fuel kit. This is a Lennox...

    The FM21 is a fossil fuel kit. This is a Lennox system with an XP19 two stage heatpump with G61MPV two stage gas furnace with variable speed blower. It seems like there is a conflict between the...
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    819

    If you use a Honeywell 8320 with a heatpump with...

    If you use a Honeywell 8320 with a heatpump with backup fossil fuel do you need to use the Lennox FM21 or can it be eliminated?
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