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Choose the Perfect-Sized Furnace for Your Home

Close Up of Lennox Logo on FurnaceWhen it comes time to have a new furnace installed, it’s important that you buy the right size for your house. A furnace that is too big will cost you more money in energy and equipment. A furnace that is too small will not adequately heat your house. The right sized furnace will heat your home efficiently and maintain consistent temperatures. Here’s what you need to know to choose the perfect-sized furnace for your home.

BTUs and Furnace Size

Furnace sizes are measured in British Thermal Units per hour – or BTU for short. A single BTU is the amount of heat energy required to raise the temperature of one pound of water by one-degree Fahrenheit. Although every house is different, the average 2,000 square foot home in an area with a moderate climate needs a furnace with 50,000 to 60,000 BTUs to properly heat the house. The larger the home, the more BTUs required to heat the space. The smaller the home, the fewer BTUs required to heat the space.

The factors that go into calculating the right size furnace include things like average temperature for your climate zone, amount of ductwork in the house, number of people living in the house, number of windows, sun exposure, amount of insulation, and more.

The Right-Size Furnace

A furnace that is the right BTU size for a house will gradually warm up that amount of square footage and then shut off. Then the cycle is repeated over and over throughout the day, without producing too much stress on the equipment. There is even heating, with no cold or hot spaces. Only when a furnace is the right BTU size, will the equipment be energy efficient and run for years and years before it needs to be replaced.

Problems of an Over-Sized Furnace

If a furnace is too large for a home, it will generate too much heat for the space. When there is too much heat, the thermostat shuts down the furnace prematurely. This is known as short cycling. This means the furnace will turn on and off in shorter intervals than for which the equipment is designed. The furnace senses the entire house is warm but still has the heating capacity to continue to heat. These short cycles of turning on and off can wear out the equipment, and you’ll need heating repair services.

Problems of an Undersized Furnace

Just the reverse is true if a home has a furnace that is too small for the space. An undersized furnace will stay on much longer than it is designed stay on. In really cold temperatures, this will make the furnace run almost continuously as it tries to reach the optimal temperature to heat the home. This also puts undue stress on the system and leads to higher energy bills as the small furnace has to work overtime. Don’t be tempted by the lower price of a small furnace. In the long run, you will pay more to heat your house, and the furnace will break down, short of its life expectancy.

Calculating the Right Size FurnaceCouple Looking at Furnace at Store

When it comes time for a new furnace, contact a heating company specializing in furnaces and heating replacement in Cumming, GA, for an estimate. To determine the right number of BTUs you need to heat your home properly, the company will first estimate the square footage by adding up room dimensions. They will also examine your ductwork to ensure there is proper airflow to the areas you need to heat. The amount of attic insulation will be measured, and it may be recommended that you add more insulation to raise your energy efficiency level. They will check the windows for energy efficiency as well. If your home is lacking in some areas of energy efficiency, that will require slightly more BTUs from the furnace. Then based on the winters and geographic location of your home, the heating company will recommend the right furnace based on BTU requirements.

To learn more about choosing a furnace for your home or heating repair services in Cumming, call Cool Air Mechanical at 770-266-5247.

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