What’s the Difference Between a Multi-Speed and Variable Furnace?

Residential forced-air furnaces have come a long way since the devices were first introduced in 1930s. Homeowners now have several furnace options from which to choose. The primary differences between these appliances are how the heating unit communicates with the thermostat and the speed of the blower motor. While many older furnaces are single stage appliances, their modern counterparts are multi-speed or variable speed devices.

Single Stage Furnace

These appliances are equipped with single-stage heating units that cycle on and off as they work to keep your home at a comfortable temperature. The speed of the blower motor does not vary. The heating unit produces a consistent quantity of warm air until the desired temperature is reached and then the thermostat turns the system off. Another characteristic of these appliances is that cold air flows from the registers when the unit first comes on. Because these appliances must cycle continually, they are the least efficient heating option. When it is time to replace or upgrade your heating system, you should consider installing a multi-speed or variable speed furnace.

Multi-Speed Furnace

As the name implies, this device has more than one setting. The furnace blower motor is usually designed to operate at a low or high speed. Some models have a larger number of settings. This process enables the furnace to operate at the level required to maintain the temperature within your home. It can produce more or less heat as required, which enables the unit to run more efficiently at a lower cost. A thermostat equipped with intelligent technology communicates with the furnace dictating the speed at which the motor operates. A multi-speed furnace helps to reduce drafts, temperature fluctuations and the noise associated with air handlers.

Variable Speed Furnace

The most quiet and energy-efficient design is a variable speed furnace. These units are coupled with a computer-controlled thermostat. In order to maintain a constant temperature within your home, the blower motor can run at several different speeds, which are adjusted automatically by the thermostat. Because it may operate continuously at a low speed, a variable speed unit provides more even heating by constantly circulating air within your home. There are no pockets of cold air inside the ductwork. As a result, you will not experience the blast of chilly air that occurs with single stage units. Because more air flows through the filters, the constant circulation produces cleaner air and lowers humidity levels. While initially more expensive to install, the energy-efficient design saves money over the lifespan of the unit.

Innovative technology and newer materials have enabled manufacturers to produce numerous furnace options for you to heat your Lake Zurich, IL, home. Multi-speed and variable speed furnaces can save energy and lower monthly utility bills while providing additional comfort. If you need more information on furnace installation or service, contact our office. We will gladly schedule a time to assist you in exploring your options and provide you with a free no-obligation quote.