There are several factors to consider when sizing a furnace for a house, including the square footage of the building and the climate it occupies. A rule of thumb is to allow 25 to 30 BTU per square foot for moderate climates and up to 45 BTU per square foot in harsher climates. For a 2,000 square foot home, the ideal furnace size therefore varies from 60,000 to 90,000 BTU.Continue Reading
Efficiency is an important consideration in selecting the correct size of furnace for a home. Multiplying the BTU output by the rated efficiency provides the effective BTU. A difference of as little as 10 percent in efficiency can have a big impact on the actual output of the unit. Choosing a higher efficiency unit allows an owner to reduce the size of furnace required, according to The Nest.
The correct size of furnace improves comfort levels in the home and ensures a longer furnace life. Furnaces that are too small are often overworked to keep a home comfortable, causing additional wear on the components. When outside temperatures drop, an undersized unit can lose its ability to maintain the desired comfort level. However, selecting an oversized unit also causes problems. The unit will then heat the home quickly and shut off. Such short-cycling is hard on the mechanical parts of the furnace and often leads to premature failure.Learn more about Heating & Cooling
The size of furnace needed for a home depends on the size of the home or the geographic location of the home. The needed BTUs are calculated based on the home size and the desired amount of heat.Full Answer >
The best furnace is one that is the right size for the space, efficient and reliable and has the right features for the specific buyer and home. The furnace should also be installed by a reputable and experienced contractor who is aware of how to correctly calculate a home's heating needs.Full Answer >
Calculators to estimate the correct size of furnace for a given space are available. For example, the website FurnaceCompare.com provides a calculator that determines a range of appropriate furnace output capacities for a given application.Full Answer >
To determine the size of air conditioner needed in a space, first measure the square footage of the area that needs to be cooled. Determine how many British thermal units the air conditioner has to produce per hour to cover the square footage. Make any necessary adjustments for special conditions, such as cathedral ceilings, heavy shaded rooms or rooms that receive direct sunlight.Full Answer >