How Does an HVAC System Work?

Modern Times Jul 15, 2019
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Forced Air Systems

Forced air systems use a blower which (as the name suggests) forces hot or cold air through metal ducts. Hot air travels through one duct set and cold air travels through another set, depending on whether the homeowner is using the furnace or the air conditioner.

Gravity System

Gravity systems rely on the principle that cold air sinks and hot air rises. This means a gravity system cannot be used alongside an AC system. Gravity systems are housed in the basement: warm rises through the ceiling and heats your house when the system is turned on. When the system cools, it sinks down again and is reheated.

Radiant Systems

Radiant systems are typically used to heat tools like radiators. Like gravity systems, they can’t be used alongside AC systems. These systems warm the walls, floors, and ceilings in a room. The main drawback is the pipes used to move hot water. Overtime, wear and tear or mineral deposits can cause them to break down.

Furnace and Air Conditioner

Every HVAC system incorporates four main parts. Two of these parts are the furnace and air conditioner. The furnace uses oil or natural gas to heat the air and is usually found in the attic or basement. Alternatively, the AC uses electricity and coolant liquid to cool the air, and is found outside the home.

Ductwork and Thermostat

The other two components that HVAC systems use are a thermostat and ductwork. Ductwork refers to the transit system which moves hot and cold air through a building’s interior. A thermostat is like the brain of the HVAC system: it controls the temperature, turns the system on and off, and controls any special features.
HVAC systems are simpler than you might expect — they’re only a furnace and air conditioning unit combined. It’s best to look local for providers, so if you’re in Georgia, consider hiring a professional HVAC contractor in Cumming, GA to repair or install a new system for your home or business.