ZAP Knowledge Center
Homeowner Habits & Common HVAC Myths Explained
Many HVAC problems start with everyday habits or long-standing myths that sound believable but actually reduce comfort and efficiency. From closing vents and constantly adjusting thermostats to relying on outdated advice, small mistakes can make your system run longer, waste energy, and wear out faster. This guide breaks down the most common habits and myths homeowners ask about—and what to do instead to keep your home comfortable and your system healthy.
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No. Covers can trap moisture and cause more harm than good.
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No. It is better to turn it up a few degrees and let it run than to shut it off completely.
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No. It only makes the system run longer, not faster.
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No. Humidity and heat will overwhelm the system.
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It can help even out temperatures but may raise humidity. It depends on the home and the system.
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Closing doors can restrict airflow and cause pressure problems. It is usually better to leave doors slightly open.
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No. It increases static pressure and can harm the blower and coil.
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Vinegar is safer. Bleach can damage some materials over time.
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Yes. It should not be in direct sun, near vents, or on an exterior wall if possible.
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No. Proper duct cleaning requires the right equipment and technique to avoid damage.
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Not if the ductwork or design is wrong. Bigger equipment usually makes things worse. A manual J Load calculation should be performed every time for system size.
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In many cases, attic fans can pull conditioned air out of the home. It must be done carefully.
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Possible if it meets manufacturers clearances. It needs proper airflow. Cramped locations could cause performance issues.
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Not very well. That is more about filtration and source control.
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From an HVAC standpoint, cooking odors are more about kitchen ventilation than your AC system.
