Variable speed in an HVAC cooling system refers to the ability of the compressor and fan motor to adjust speed based on the heating and cooling needs of your home. A variable-speed system is the most efficient and quiet HVAC system.
A variable-speed air conditioner or heat pump can maintain precise and consistent temperature control and humidity control. It can run at anywhere from 25-100% capacity, depending on the indoor and outdoor temperatures, indoor humidity level, and your set temperature.
American Standard variable-speed heat pumps and variable-speed AC units utilize the Duration™ variable-speed compressor to provide you with optimal comfort. AC units have up to 700 speeds while heat pumps have up to 750 speeds. Variable-speed units must be paired with a variable-speed air handler or compatible furnace.
A variable-speed air conditioner or variable-speed heat pump paired with a compatible furnace or air hander will cost more upfront but can save you money in the long run because of its high energy efficiency.
Another feature of a high-efficiency HVAC system is a variable-speed blower motor on the indoor unit (furnace or air handler). A variable-speed motor may run longer, but it runs at lower speeds, constantly adjusting the temperature and humidity for ultimate comfort.
The variable speed unit starts at a lower level, meaning it’s quieter than a single-stage unit that turns on at 100% capacity. You get better energy efficiency with less noise. It’s a win-win!
Learn more about the differences between variable-speed, two-stage, and single-stage systems. Then contact your American Standard dealer today for more information on a new HVAC system., and what system is right for your home.
By Anne Fonda, Content Writer
Expert review by Mark Woodruff, Senior Product Manager, Ducted Outdoor
A single-stage, or single-speed, system is the base-level HVAC system. A single-stage air conditioner, single-stage furnace, or single-stage heat pump all have two settings – on or off. This means each time the thermostat signals the unit to heat or cool, the system comes on and operates at 100% capacity.
In HVAC equipment, the word stages refers to the heating or cooling capability. The stage may also be referred to as speed – as in single-speed, two-speed, and variable-speed. Two stages simply means the unit has two heating stages or two cooling stages. Low speed, or first stage, might be running at 65% capacity, while the second stage, or second speed would be at 100% capacity.
Comfort R is an HVAC component incorporated into certain American Standard variable-speed blowers that reduces humidity and maintains a comfortable temperature inside.
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