How do you calculate the number of BTUs per square foot?
Credit:akurtzE+Getty Images
Q:

How do you calculate the number of BTUs per square foot?

A:

Quick Answer

Calculations of the number of British Thermal Units necessary to heat or cool each square foot of a room must also account for the climate zone and the room's insulation, sun exposure and primary function. Some calculations also account for the ceiling height. Divide the final BTU calculation by the total square footage to get the number of BTUs per square foot.

 Know More

Full Answer

  1. Calculate the square footage

    For square rooms, calculate the square footage by multiplying the room's width by its length. For irregular shapes, divide the room into a combination of squares and triangular shapes. Calculate the square footage of each shape and the add them together to determine the total for the room.

  2. Check the climate zone for BTU calculation

    Check the climate zone maps provided by the U.S. Energy Information Administration to determine the necessary BTUs per square foot for your specific climate.

  3. Adjust BTUs to account for shade

    For heavily shaded rooms, reduce the amount of BTUs by 10 percent. Increase the amount by 10 percent for rooms with heavy sun exposure.

  4. Increase BTUs for multiple occupants

    For rooms expected to regularly hold more than two people, increase the number of BTUs by 600 for each additional occupant.

  5. Add BTUs for kitchens

    For kitchens, add 4,000 BTUs to compensate for the energy from appliances.

  6. Account for insulation quality

    Add BTUs for rooms with poor insulation, and subtract for rooms with good insulation.

Learn more about Measurements

Related Questions

  • Q:

    How can you convert between BTUs and CFH?

    A:

    The British thermal unit, or BTU, is a unit of the energy needed to change the temperature of a pint of water by one degree Fahrenheit. One cubic foot, or CF, of natural gas can change the temperature equivalent to about 1000 BTUs. Therefore, a flow of 1 cubic foot per hour, or CFH, of natural gas is equivalent to providing approximately 1000 BTUs every hour.

    Full Answer >
    Filed Under:
  • Q:

    What is a good SPF number?

    A:

    According to the Skin Cancer Foundation, a good SPF number depends on expected sun exposure, skin tone, age and family history of skin cancers. An SPF of 15 is generally sufficient for daily activities. For extended sun exposure, an SPF of 30 or higher is recommended.

    Full Answer >
    Filed Under:
  • Q:

    What are the causes of lip discoloration?

    A:

    Lip discoloration is caused by a number of factors including anemia, cyanosis, melasma, too much sun exposure, consumption of excessively hot food, high intake of caffeine, licking and biting of lips, vitamin B deficiency, high levels of iron, hormonal changes, allergies, excessive pigmentation, dry lips or jaundice. Discoloration of lips can also sometimes be a hidden symptom of cancer in some cases.

    Full Answer >
    Filed Under:
  • Q:

    How do you convert air conditioner BTUs to tons?

    A:

    To convert BTUs to tons, find the BTU capacity of the air conditioner, and divide the BTUs by 12,000. Twelve thousand BTUs equals the amount of heat removed by an air conditioner that would melt 1 ton of ice in 24 hours, which is called the chiller refrigeration ton, according to The Engineering Toolbox.

    Full Answer >
    Filed Under:

Explore