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Hyrdoair & humidity

Unknown
Unknown
in THE MAIN WALL
Is there a differnce in the system humidity between a 100k btu regular furnace and a 100k btu hyrdoair furnace?
Don Meier

Comments

  • Mark Hunt
    Mark Hunt Member Posts: 4,908
    No


    Building humidity levels are dependant the amount of air infiltration in a structure, nothing else.

    The heating distribution system has nothing to do with how moist or dry a building is.

    When a building is tight, there will be higher moisture.

    If it is loose, it will be dry in the heating months.

    STACK EFFECT: Warm, moist air rises and leaves a building at the top. Cool, dry air enters at the bottom and begins to warm and pick up moisture as it rises. The greater the amount of air leaving, the drier the building will become.

    Hope this helps.

    Mark H

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  • Unknown
    Unknown
    stack effect

    I get the point. The question came from the thought that a gas furnace heat exchange would run hotter and evaporate the humidity then a hyrdoair furnace that runs at 180 F. Your point as it relates to baseboard heating is it only takes the air in its own room and recyles it reducing the stack effect and forced air heating moves the air in the entire house increasing the stack effect.
    thanks Don Meier
  • Mark Hunt
    Mark Hunt Member Posts: 4,908
    Not exactly


    Even if a forced air HX heats and evaporates moisture, that moisture would then be pumped back into the building.

    The only way the building can "dry out", is if the moisture leaves.

    Convective air movement in a building is the transportation of the moisture, and EVERY building has convection regardless of the type of heating system.

    If a forced air system is properly designed and installed, it would have little if any effect on the amount of air leaving a building.

    I have heard every type of heating system blamed for "dryness", getting people to understand that it is caused by air leakage is sometimes difficult.

    I will say this, any time an atmospheric or power vented appliance is replaced with sealed combustion, the amount of air leakage is reduced. Other than the chimney, heating systems have no effect on building humidity.

    Mark H

    To Learn More About This Professional, Click Here to Visit Their Ad in "Find A Professional"
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