Common AC Myths Debunked

Air conditioning (AC) systems are essential for comfort in many homes and businesses, especially during the hot summer. However, several myths and misconceptions about AC systems can lead to inefficiencies, higher costs, and even damage to the system. Here are some common AC myths debunked:

Myth 1: Bigger AC Units Are Better


  • Oversized Units: Larger units are not necessarily better. An oversized ac repair company will cool the space too quickly without properly dehumidifying it, leading to a clammy and uncomfortable indoor environment. It will also cycle on and off more frequently, causing increased wear and tear on the system.
  • Proper Sizing: It’s important to have an appropriately sized AC unit for your space. A professional HVAC technician can calculate load to determine the correct size for your needs.

Myth 2: Setting the Thermostat to a Very Low Temperature Cools the Room Faster


  • Thermostat Settings: Setting the thermostat to an extremely low temperature will not cool the room any faster. The AC unit works consistently, and lowering the temperature setting only makes the unit run longer to reach the set temperature, which can increase energy usage and costs.
  • Efficient Cooling: For efficient cooling, set the thermostat to a comfortable temperature and be patient as the unit cools the room gradually.

Myth 3: Ceiling Fans Cool the Room


  • Air Circulation: Ceiling fans do not cool the air; they simply circulate it. The breeze created by a fan can make you feel cooler by evaporating sweat from your skin, but it does not lower the room temperature.
  • Supplementary Use: Use ceiling fans in conjunction with your AC to feel cooler at a higher thermostat setting, which can help save on energy costs.

Myth 4: You Don’t Need to Change the Air Filter Frequently


  • Filter Maintenance: Air filters should be checked and replaced regularly, typically every 1-3 months. A dirty filter can restrict airflow, reduce system efficiency, and lead to higher energy bills and potential system damage.
  • Air Quality: Regular filter changes improve indoor air quality by trapping dust, allergens, and other pollutants.

Myth 5: Closing Vents in Unused Rooms Saves Energy


  • System Balance: Closing vents can disrupt the balance of your AC system, causing pressure imbalances and making the unit work harder. This can lead to increased wear and tear, reduced efficiency, and even damage to the ductwork.
  • Proper Airflow: Keep vents open to ensure proper airflow throughout your home. If you need to control temperatures in specific areas, consider a zoned AC system.

Myth 6: Maintenance Is Only Necessary When There’s a Problem


  • Preventive Care: Regular maintenance is crucial for the longevity and efficiency of your AC system. Scheduled maintenance can catch potential issues early, prevent breakdowns, and ensure the system operates at peak efficiency.
  • Cost Savings: Preventive maintenance can save money in the long run by avoiding costly repairs and extending the lifespan of the unit.

Myth 7: The Location of the Thermostat Doesn’t Matter


  • Thermostat Placement: The thermostat’s location significantly affects the accuracy of temperature readings and system performance. Placing it near heat sources, direct sunlight, or drafty areas can result in incorrect readings and inefficient operation.
  • Optimal Placement: The thermostat should be placed in a central location, away from direct sunlight, drafts, and heat sources, to ensure accurate temperature control.

Myth 8: Duct Tape Is Best for Sealing Ducts


  • Duct Sealing: Despite its name, standard duct tape is not suitable for sealing ducts, as it degrades over time. Proper duct sealing requires mastic sealant or metal-backed (foil) tape.
  • Efficiency: Properly sealed ducts prevent air leaks, improve system efficiency, and enhance indoor air quality.

Myth 9: Lowering the Thermostat at Night Isn’t Necessary


  • Nighttime Settings: Lowering the thermostat at night can lead to energy savings, as cooler outdoor temperatures require less work from the AC unit to maintain a comfortable indoor temperature.
  • Programmable Thermostats: Using a programmable or smart thermostat can help automatically adjust temperatures for energy efficiency without sacrificing comfort.

Myth 10: All HVAC Contractors Are the Same


  • Contractor Quality: The quality of HVAC contractors varies significantly. It’s important to choose a licensed, reputable, and experienced contractor for installations, repairs, and maintenance.
  • Due Diligence: Research contractors, read reviews and ask for recommendations to ensure you hire a trustworthy professional.


Understanding the facts about AC systems can lead to better maintenance practices, improved efficiency, and enhanced comfort. By debunking these common myths, you can make informed decisions about your AC system, ensuring it operates effectively and efficiently for years to come. Regular maintenance, proper sizing, and thoughtful use of your AC unit will help you save energy and money while keeping your indoor environment comfortable.

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