The proper furnace size can be determined by a contractor using industry-standard calculations, but an estimate can be determined by using a British thermal unit, or BTU, calculator. Free BTU calculators can be found onl... More »

www.reference.com Home & Garden Heating & Cooling

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 contrac... More »

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 cli... More »

BTU, which stands for British Thermal Unit, is a unit measurement often used to list how much energy a gas furnace or other heating unit produces. One BTU is the amount of energy required to heat one pound of water one d... More »

www.reference.com Home & Garden Heating & Cooling

To reduce the costs of new furnace installation, buy a unit that is appropriately efficient and no larger than the size of home requires. To make sure of the best deal, obtain at least three estimates and negotiate with ... More »

www.reference.com Home & Garden Heating & Cooling

Replace a Leonnox furnace filter by turning off the unit, locating the filter, determining if it is reusable, purchasing the correct size filter, and installing the new filter. Replace filters at least four times per yea... More »

www.reference.com Home & Garden Heating & Cooling

The size of a home does not dictate the furnace British thermal unit output needed to heat it properly or efficiently. Several factors must be considered when deciding on the correct furnace BTU output for a specific hom... More »