When you choose ENERGY STAR qualified heating and cooling products, you know you’re making a smart decision
That can significantly reduce your monthly utility costs.
The higher the
AFUE rating (
Annual Fuel Utilization Efficiency) means the better the efficiency of individual furnaces. A furnace with the higher (AFUE) will perform better with less energy to operate. When buying a new furnace, compare the (
AFUE) ratings. A furnace that has an 80% AFUE rating converts
80% of the fuel that you supply to heat and the other
20% is lost out of the chimney. High-efficiency furnaces typically cost more upfront than low-efficiency furnaces. However, they tend to cost less to operate on a month-to-month basis as they use less fuel to generate the same amount of heat. Windows, doors and insulation also play a huge part in energy consumption.
An oversized furnace that the capacity is too large will cost more to operate than a correctly sized furnace. This is because oversized furnaces cycle on and off too often and cycling on and off is more expensive to operate and less energy-efficient, than running consistently for a long period of time.The only way to know if your furnace is correctly sized is for a well qualified HVAC Contractor to do a load calculation. A load calculation takes into account the size of your house, the insulation value of your windows, the amount of insulation in your walls and roof, and a host of other mandatory criteria to determine the appropriate furnace capacity for your new home or replacing an old existing wore out one.
This also is not a good time to go cheap.
Good installation makes all the difference in the world, in the efficiency and operation of the furnace.
The industry accepted standard, the Manual J, is best performed by a professional contractor who has the necessary software and experience to easily complete the task of finding out what you need for your home, rather than attempting this yourself. Most installations will only take one day and additional costs can be incurred if ducting changes are necessary and some retrofitting may be needed.