Furnace sizes are commonly based on the square footage of your home. However, using only that measurement may be inaccurate. To correctly determine the size of the furnace that you need, figure the load calculation. Avoid overpaying for a furnace or buying one that is too small by following a few simple steps. Make an energy-efficient purchase, and save money on your utility bills.

Load Calculations

Measure the square footage of your home, including all rooms, closets and hall areas. If you have a basement, include it in your measurements. Use a load-calculation website to determine the heating requirements of your home. The load calculation takes into consideration a variety of factors, including the number of windows in your home, the material type and color of your roof, and the temperature level at which you want to keep your home. Use the load calculation that you have performed to determine the size of the furnace that you need. Furnaces come in a variety of BTU increments. The BTU--or British thermal unit--is a unit equal to the amount of heat required to raise one pound of water one degree Fahrenheit. Consider this scenario as an example: Your load calculation determines that you need 60,000 BTUs for heating your space. The manufacturer you chose offers 50,000 and 75,000 units. As a rule, always choose the next highest increment of BTU. In this example, you would choose the system that provides 75,000 BTUs.

Professional Help

Work with a qualified and reliable contractor when determining the heating needs of your home. Do your own research, but include a professional opinion in your decision. Double check calculations that your contractor provides. Seek reviews and information on any equipment that he recommends.

Carbon Monoxide

A home-heating system can be dangerous if it is not chosen correctly and properly installed. There is no reason to risk problems such as carbon monoxide poisoning in your home. High levels of carbon monoxide can be harmful--and even deadly. Install carbon monoxide detectors near sleeping areas, next to furnaces and other fuel-powered heating appliances.

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Load Calculation Information

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Carbon Monoxide Information