Understanding how a home comfort system works starts with knowing what it is and what it consists of. A home comfort system, also called an HVAC system or a split system, has four parts:

  1. Indoor unit, such as a furnace or air handler
  2. Outdoor unit, either an air conditioner or a heat pump
  3. Thermostat
  4. Indoor air quality component, like a filtration system or humidity control product

The Basics of a home comfort system

A home comfort system is essential to keeping you warm in the winter and cool in the summer. It also helps protect you from allergens and pollutants year round.


Explore the differences between single- and multi-stage gas furnaces with Precise Comfort® technology, which creates an environment of perfectly heated and humidified air.

Air Conditioner

Explore the differences between single-, two- and multi-stage air conditioners with Precise Comfort® technology, which allows units to maintain your set temperature regardless of outside conditions.

Heat Pump

Heat pumps are an efficient choice when you want cool air most often, and heated air only on occasion. Learn why dealers often recommend electric heat pumps for warmer climates.


See how the iComfort® S30 Smart Thermostat adapts to your life to deliver the ultimate in energy savings and precision temperature control, with advanced features like “Smart Away” mode, “Allergen Defender” and “Feels Like.”


Indoor Air Quality System

Learn how Healthy Climate® indoor air quality products can help keep the air in your home fresh and clean.

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