What is Variable Speed?
What does it do?
The variable-speed blower motor is a "smart" motor, varying it speed to fit your homes heating and cooling requirements. And it does this so quietly that you may not even know it's running. It operates especially quietly during the first stage of low-heat operation. During continuous fan operation, the blower operates at 50% of cooling airflow; therefore, sound is minimized.
In a conventional single-stage furnace, air is pulled through a filter at a consistently high speed, lessening the filter's ability to collect dust and allergens. Because a variable-speed furnace blower operates at slower speeds and provides constant airflow for less than one-tenth of the cost of most conventional motors, your indoor air quality and energy savings will greatly improve. A slower fan speed means more unwanted particles cling to the filter, allowing cleaner air to flow into your home.
The variable-speed furnace makes a difference with a central air conditioner. It will give you greater comfort during colling because of and enhancement feature built right into the system. The increase comfort you'll feel is the result of better humidity control. During cooling, air moves over the coil more slowly at startup. This allows the coil to rapidly cool down, resulting in greater moisture control and higher efficiency.
In addition to greatly reducing temperature differences throughout the house, improving humidity control during both heating and cooling operation, boosting the A/C system efficiency approximately 10%, and providing constant air cleaning, a variable-speed furnace can save you as much as $200 - $400 a year in electricity consumption alone.