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The Various HVAC Systems in Your Home Impact Each Other: Here's How

September 23, 2014 | Blog

Most central HVAC systems are integrated– that is, they use the same ducting and circulation fan to cool or heat the home. While this is simpler and saves costs, it means a breakdown of one system affects the other.

Combined HVAC System Layout

HVAC systems use the air handler unit situated at the bottom of the gas furnace to circulate air through the ducts to each room. The air conditioner is usually a split unit with the compressor and condenser outside and an evaporator coil fitted into the ductwork just above the furnace.

Circulating Fan

The fan circulates both cool and hot air to the home. It needs to be kept clear of fluff and dirt as these affect flow. Air leaks in the fan casing will reduce flow and lead to poor operation.

Air Filter

The filter is usually fitted in the ductwork before the air handler and must be cleaned or changed on a regular basis or air flow will be restricted, leading to poor operation of your HVAC system. It’s easy to see when it’s blocked as the surface will be dirty and covered in fluff.


Most problems occur in ducts as flexible ducting is easily damaged and joints in rigid ducting pull loose. Ducts should be checked at least once a year to ensure no blockages or leaks; these greatly reduce the efficiency of your HVAC system.


The thermostat controls both heating and cooling. If your air conditioner is not working, check that the thermostat is not set to heating and the set temperature is lower than ambient. Make sure it’s not switched off or if it is a wireless unit that the batteries aren’t out of power.

Working Together

In order for your heating and cooling HVAC system to work, all the common parts, including fan, filter, and ducting, must be maintained in good order. If you need help sorting out your HVAC system contact us at CCAC, Inc.; we serve the Coastal Bend area and have over 35 years of experience in HVAC systems and will inspect and repair your system and keep you cool.

Our goal is to help educate our customers in Corpus Christi, Texas about energy and home comfort issues (specific to HVAC systems). For more information about HVAC systems and other HVAC topics, download our free Home Comfort Resource guide.

Credit/Copyright Attribution: “Ioannis Pantzi/Shutterstock”

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