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What is involved in converting a single zone HVAC to a dual zone system using one compressor? Given all my existing parts will remain and no new condenser or evaporators will be added, I assume it will require a baffle/damper to direct the air to up/down/both areas depending on which thermostat get triggered. What parts best suit this type conversion? Is there an intermediate circuit board which would be required?


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HVAC:

Vendor: Lennox
CONDENSER: 10AC42-3P
EVAPORATOR/HEAT: 80MGF3/4-100A-1
Approx: ~15 yrs
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HOUSE:

- Built in 1995
- 2200sf with existing thermostat on lower level.
- Evaporator and heater (gas) are in the attic.
- All vent lines are very accessible in the attic.
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Regards,

-Inet
 

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Zone panel.
Motorized Dampers.
Bypass damper.
Thermostat/stats.
 

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23,688 Posts
That furnace is prone to cycling on the limit control (lower temp type) so I would not want to throttle the airflow with dampers etc or it may be a problem. A newer furnace Lennox G71 with a variable speed ECM motor or G60UHV will handle that situation better. I have worked on hundreds of 80MGF/G24s.
 
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