Calculation for heat supply to a given area

Discussion in 'HVAC Heating & Cooling' started by idoc4u, Jul 20, 2010.

  1. idoc4u

    idoc4u New Member

    Sep 1, 2009
    Is there a tabel, nomogram, or some directive regarding standards for supplying heat to a given square foot area or cubic foot area of a room in a home?

    I am wanting to supply adequate heat to a look-out basement in a home that is new construction, well insulated with a usable area of about 600 ft sq.

    I have installed 2 six inch round duct supplies overhead (wasn't possible to run down the wall) about 12 ft apart to the area in question and have a return duct in place.

    I am thinking about adding electric baseboard heat or a gas or electric fireplace to supplement as it would seem that the supply that I have is unlikely to be adequate. It is not possible to add additional duct work in the area.

    Does anyone know of some rule of thumb or guide for calculating functional heat needed for a given area?

    A vented or ventless gas fireplace would seem to fit the need well, since electric takes time to heat up and gas will be very quick.

    Thank you.
  2. Hube

    Hube New Member

    Sep 1, 2004
    Same questions, same answers.
    check previous posts.
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  4. jimbo

    jimbo Plumber

    Aug 31, 2004
    San Diego, CA
    Any good heating/a/c contractor can do the necessary calculations. It is not rocket science, but neither is it a number you can pull out of wherever. Today, most guys will have the manual J on their laptop. You plug in square feet, ceiling height, types of insulation, square inches of glass, climate ranges for your get the idea.

    Like I say, it is fairly easily done, but if you just guess and screw it up, you will be uncomfortable and wasting energy, forever!
  5. Furd

    Furd Engineer

    Jul 3, 2007
    Retired energy systems engineer
    Wet side of Washington State
    Do a Google search for heat loss calculation and you will get several hits. Most will be for a software package or a short period of time on a fee basis but there are some free ones. The more information (and the better the information) the closer you will come to the proper BTU requirement. Use of any "rule of thumb" will most likely vastly overestimate the requirements.

    As stated in the other thread, don't even consider a ventless gas heater option.
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