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Gas-fired furnace efficiency is expressed by a unit’s AFUE percentage. Short for annual fuel utilization efficiency, the AFUE rating provides an at a glance metric for comparing the efficiencies of different makes and models of furnaces. AFUE represents the percentage of fuel consumed by a furnace that actually contributes to usable heat versus the amount lost in the combustion process. A standard efficiency furnace has an AFUE of 80 percent or less, while condensing furnaces with an AFUE of 90 percent or above are considered high-efficiency models.
Electric furnaces are more expensive to operate than other electric resistance systems because of their duct heat losses and the extra energy required to distribute the heated air throughout your home (which is common for any heating system that uses ducts for distribution). Heated air is delivered throughout the home through supply ducts and returned to the furnace through return ducts. If these ducts run through unheated areas, they lose some of their heat through air leakage as well as heat radiation and convection from the duct's surface. This is per department of Energy.
Blowers (large fans) in electric furnaces move air over a group of three to seven electric resistance coils, called elements, each of which are typically rated at five kilowatts. The furnace's heating elements activate in stages to avoid overloading the home's electrical system. A built-in thermostat called a limit controller prevents overheating. This limit controller may shut the furnace off if the blower fails or if a dirty filter is blocking the airflow.
As with any furnace, it's important to clean or replace the furnace filters as recommended by the manufacturer, in order to keep the system operating at top efficiency.
Today's best air conditioners use less energy to produce the same amount of cooling as air conditioners made in the mid 1980's. Even if your air conditioner is only 10 years old, you may save 15% to 35% of your cooling energy costs by replacing it with a newer, more efficient model.
Heat Pumps can save from 30% to 70% off your your energy cost during the winter season. Which usually pays itself within a few years. No they are not colder if they are installed properly. Set up for an for a free home consultation.
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