How much btu to heat per square foot

how much btu to heat per square foot
The first step in calculating the BTUs you need is to calculate how much space you have in a room. To determine the number of BTUs per square foot that you need to heat a room, simply multiply the square footage by 20 BTUs per square foot. How to Buy a Mattress.

How to Calculate BTU Per Square

Therefore, a room that is square feet will need 18, BTUs 60 x Based in Washington, D. He has been involved with urban design, city infrastructure and business since Watson holds a Bachelor of Science in civil engineering from the University Florida, as well as a Master of Science in urban and regional planning from Virginia Tech. Skip to main content. Warning An oversized heating and cooling system turns on and off too frequently, causing moisture to form and subsequent damage. When undersized, the system runs too often. Both use more energy than needed. Therefore, a room with lots of windows normally means poor insulation.

When possible try to install double glazed windows to improve insulation. To find the desired change in temperature to input into the calculator, find the difference between the unaltered outdoor temperature and the desired temperature.

For example, a house in Atlanta might want to determine the BTU usage during winter.

how much btu to heat per square foot

Homes in more extreme climates will obviously require more radical changes in temperature, resulting in more BTU usage. Obviously, size and space of house or room, ceiling height, and insulation conditions are very important when determining the amount of BTUs required to heat or cool a house, but there are other factors to keep in mind:. Financial Fitness and Health Math Other. You absolutely want to consider how efficient your furnace is, which this ratio will help you determine. Remember, an inefficient furnace will use more energy. But it is not the only factor to consider!

how much btu to heat per square foot

While total square footage will give you a base output, you will need to adjust that output for several other factors depending on where you live. When determining the correct heating capacity, you will need to factor in all of the following: You will need to adjust that figure however for your furnace's efficiency, the climate where you live, and the state of your house.

how much btu to heat per square foot

Measure your square footage. Measure the square footage of each room you plan to heat or cool and add them together. If you're installing a furnace or central air conditioning system, this typically includes every room. In some homes, the ducts do not connect to the attic or basement.

For a rectangular room, multiply the length and width, measured in feet. For a triangular room, multiply the length and width, then divide by two. For a circular room, measure the radius r the distance from the center to the edge.

Calculate How Many BTUs are Needed to Heat Home

For rooms with odd shapes, divide them into smaller pieces and measure each piece separately. Determine the necessary heating or cooling capacity.

how much btu to heat per square foot

The capacity of furnaces and air conditioners is given in BTUs per hour. You need to establish the correct number of BTUs per square foot for your house needed to either heat or cool it. The methods differ for heating and cooling and are described below.

How Many Btu to Heat a Square Foot?

At a bare minimum, you can use a figure of 20 BTUs per hour per square foot and multiply this by the total square footage to be heated or cooled, but this does not take into account climate, the amount of insulation you have, or the way you live. Method 1 Quiz Which is the correct formula for measuring square footage of a rectangular room? Pi times radius squared. Length times width divided by 2.

how much btu to heat per square foot

Figure the total square footage to be cooled. If you're buying a room air conditioner, you only need to figure the room whose window the air conditioner will be installed in; if you're buying a central air conditioner or heat pump, you need to figure the entire square footage of the house served by ductwork, as described under "Determining How Much to Heat or Cool.

Determine the necessary capacity. One method for determining capacity is refer to the estimates on this index.

how much btu to heat per square foot

Adjust for special conditions. If you're buying a room air conditioner instead of a central unit, you can adjust your needs according to the following factors: Reduce the necessary capacity by 10 percent if the room to be cooled is heavily shaded.

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how much btu to heat per square foot

It is very important to size your heating and cooling system correctly for your home. If a furnace or air conditioner is sized too small it will run constantly and not be able to comfortably heat or cool the space. On the coldest or hottest days the system will not be able to keep up.

BTU Calculator

Alternatively, if the system is sized too large then it will heat or cool the space too quickly, which will cause it to cycle on and off more frequently, causing unnecessary wear and shortening the lifespan of the system. According to the Star Tribunethe constant cycling of an oversized furnace is less comfortable as well, since certain areas of the home heat up too quickly and become too hot before the system turns off.

There are several factors to consider when trying to figure out how many BTUs your furnace should be.


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