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Thread: HVAC TRUNK LINE

  1. #1
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    HVAC TRUNK LINE

    Hi and how are you? i was at my friend's house the other day. i notice that the supply register and return are on the ceiling of the first floor and second the floor the supply register are on the floor.

    my question is , is it okay to use one supply trunk line to supply air to the two floors. the supply trunk line is inside the truss of the floor. the second floor or first floor ceiling.( the floor/portion separating first and second) no hvac trunk line in the attic. the gas Furnace is on the same ground level as the first floor.

    is this a good way. using one trunk line to supply two floors. what can be done to improve such installation. with this install, the second floor get hot and the first floor not so warm.

    what can be done to even out the heat supply to both floors.

    can a supply duct be run down inside a 2x4 wall to add a supply vent down by the wall.

    second floor has carpet and the first floor has wood.

    what is the disadvantage for having single trunk line to supply two floors. one floor has vent on the floor and the other floor has vent on the ceiling.

    thank you for your knowledge.

  2. #2
    Join Date
    Dec 2005
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    The disadvantage to have a single heating system supplying 2 floors is uneven heating.

    The ultimate solution, would be a furnace and duct system for the first floor. An entirely different system including ductwork for the second.

    Next best solution is proper ductwork.

    Next best is zoning.
    "Better tell the sandman to stay away, because we're gonna be workin on this one all night."

    "Dude, you need more than 2 wires to a condenser to run a 2 stage heatpump."

    "Just get it done son."

    Dad adjusted

  3. #3
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    Thread Starter
    dual zone with two thermostat will help solve the uneven heat.

  4. #4
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    Thread Starter
    can you please elaborate on the proper duct work. adding damper. should damper be added for each upstairs register or just one damper for upstairs and a damper for downstairs

    with two thermostat on one furnace, how is the furnace able to produce to different heat level. for example if the upstairs is set at 72 and the downstairs at 78. is the furnace capable of produce two different heat degree or how does it work. two thermostat and one furnace.

  5. #5
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    Arzel zoning make a product that might save a huge rip out and re do.

  6. #6
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    Quote Originally Posted by mgkamz View Post
    can you please elaborate on the proper duct work. adding damper. should damper be added for each upstairs register or just one damper for upstairs and a damper for downstairs

    with two thermostat on one furnace, how is the furnace able to produce to different heat level. for example if the upstairs is set at 72 and the downstairs at 78. is the furnace capable of produce two different heat degree or how does it work. two thermostat and one furnace.
    Zoning:
    2 thermostats, one furnace. Thermostat for first floor says first floor doesn't need heat. First floor dampers automatically shut. Second floor says it needs heat. Dampers for second floor open, heat comes on.
    And vice versa.

    Ductwork:
    Dampers for the first and second floor. Open and close them based on season. Make the ductwork large enough that the furnace won't overheat in the winter, and cool poorly in the summer.
    "Better tell the sandman to stay away, because we're gonna be workin on this one all night."

    "Dude, you need more than 2 wires to a condenser to run a 2 stage heatpump."

    "Just get it done son."

    Dad adjusted

  7. #7
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    Dec 2016
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    Thread Starter
    thanks for the ideas

    is it possilble to do two zone with two thermostat and two damper for each zone on a single trunk line in the truss between floors to supply upstairs and downstairs registers. is it possible to add more return vent . return in each room

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