Choosing the perfect sized furnace for your home is an important investment. Your qualified furnace contractor should help you make your choice of the correct furnace size. You don’t want one that is too small because it will be constantly flowing to maintain warmth. A furnace that is too big will cycle on and off frequently, which wears down its components faster, unnecessarily wastes energy, and costs more in the end.
The following factors help determine the optimal furnace size:
· House design
Calculate the Right Furnace Size
Proper furnace size should be based on energy-loss calculations. The heating capacity of a furnace is measured in thousands of BTU (British Thermal Units). Your contractor will come up with the exact BTU equations by multiplying the input BTU by the efficiency percentage. For example a 100,000 BTU furnace at 80% efficiency will produce 80,000 BTU, but if that same furnace is only at 95% efficiency it will produce 95,000 BTU of heat output.
Evolution of Furnace Types
Furnaces have evolved quite a bit in the last decade. The most modern furnaces burn less fuel than the ones from the past. Some have heat pumps that wring heat from the bottom of the floor to the ceiling and vice versa in the summer when acting like an air conditioner. These types of furnaces are most common in the Southern states, while oil furnaces are typically found in older homes in the Northeast. The most common type of heater is the modern central-heating system gas furnace.