The Parts of the HVAC System Go Beyond the A/C and Furnace

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The forced air system in your greater Cincinnati home is made up of a number of parts that all have to work together in order to maintain home comfort levels. The furnace and air conditioner are just the start. Here are other important components that are likely a part of your home’s HVAC system:

Ducts and Vents

All air circulates through the house from the air conditioner or furnace through passageways built particularly for the purpose. Known as ducts, they run through every room of the house and are typically made of galvanized metal. Openings in the ducts called vents allow heated or cooled air to pass into and out of the room.


The thermostat is one of the most visible parts of an HVAC system. It’s the little item on the wall where you set your desired indoor temperature. This unit senses the current room temperature and then signals the furnace to turn on or off as needed.  Some houses have only one thermostat, while others may have multiple thermostats t accommodate multiple heating or cooling “zones” in the house.

Heat Exchanger

Whenever the furnace turns on, cool air is sucked into the unit. The heat exchanger is the part of the furnace that actually heats the air before it’s blown into the ducts to warm the house. This may be done over an actual flame, or it may be heated electrical coils.

Condensing Unit

When the house gets too warm, the thermostat triggers the condensing unit, which is the part of an air conditioning system that’s placed outside the building. This unit exchanges heat with the outside air, then the gas is compressed into liquid and sent through refrigerant lines to the evaporator coil. Air chills in the evaporator coil as the heat there exchanges with the refrigerant, and the refrigerant – now back in gaseous form – returns to the condenser unit.

Contact us at Apollo Home Heating, Cooling and Plumbing today for more information on your HVAC system and how it works.

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"Ernie & Mike did a superb job on my new furnace and A/C installation. Despite having more than a day’s work to do, they came in and stayed until the job was done. They were organized, efficient, and protected the rest of the house well. Got both furnace and A/C installed the same day. Ernie was courteous, informative, and clearly knew his job better than anyone I’ve encountered before. The units look so good guests now get The Tour of our new system. Apollo is clearly not a fly-by-night company. I would recommend them to anyone in need of a new furnace and/or A/C."
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"The team at Apollo exceeded my expectations. As a business owner, my attention to the details and commitment to providing excellent service is high. From the sales rep. to the installation team, everyone’s performance was outstanding. For example, the installation team went to great lengths to protect our floors, placing floor runners and across the wood floors and up the stairs. They even were spot washing walls upon their departure. I highly recommend this company."
- Randy B.
"We scheduled an estimate AND a tune-up. We knew something was wrong with our furnace, but hoped we could make it through the rest of the season. Upon telling Bill what our furnace was doing, he warned us immediately what the possible outcome was going to be; a cracked heat exchanger. He watched the flames roll backward, tested carbon monoxide levels, which were so high they meter’s last reading was 5,600 before saying “high”. He immediately shut it down, tagged it, and explained that with levels that high and children in our home he wanted off right away. He continued his inspection and showed us via a camera that not only was it cracked in multiple places, but had holes all over it. He gave us a few options for repairing it; his knowledge as well as genuine concern was beneficial and refreshing. Luckily we also scheduled an estimator, Micah, to come too and we were able to get costs between repairing and replacing (with several options). We decided to replace with a much higher efficiency furnace and one sized properly to our home. Hands down, not only did they both provide us great service and knowledge, but without sounding dramatic, they may have saved our lives. This was our first time calling Apollo, but it won’t be our last."
- Sarah B.
"Apollo is an excellent company. I always receive great service. Alex A. was professional and friendly. He kept me informed during the process of checking my furnace and heat pump to make sure they were working properly. The company makes sure you are notified who is coming and when they are on the way. All my interactions with the company have been wonderful."
- Beverly S.



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