While most major brands of furnaces share many features in common, there are a few features that set different models apart:

Sound insulated cabinet.  Some furnace manufacturers have started to surround the furnace with sound insulation. The result is a quieter furnace and a quieter house.

Dual-Speed Motor.  A two speed motor on the fan circulates warm air through the house. Dual-speed motors save energy, help eliminate hot and cold spots, and are quieter because the fan is not always running at the highest setting.

Variable-Speed Motor.  A relatively recent development,  this type of fan motors does not just have one or two speeds, but is adjustable across a wide range of speeds. Variable-speed motors are more responsive to the heating requirements of your home and are much quieter than other units.

Warranty. When shopping for a furnace, it is important to compare warranty terms. Warranties will vary by which components of the furnace are covered and for how long. One variable to focus on in particular is the length and terms of the warranty covering the heat exchanger, which is one of the most expensive parts of the furnace. If a manufacturer is willing to stand behind their heat exchanger for an extended period, you can be more confident about its quality.

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