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In Florida’s hot and humid climate, air conditioning is essential for staying comfortable throughout much of the year. However, many homeowners unknowingly make mistakes that can reduce the efficiency of their AC systems, increase energy bills, and even lead to costly repairs. By avoiding these common mistakes, Florida residents can keep their homes cooler, save money, and extend the lifespan of their air conditioning systems.

Here are the top air conditioning mistakes Florida residents should avoid.

1. Setting the Thermostat Too Low

One of the most common mistakes homeowners make is setting the thermostat too low in an attempt to cool their home faster. However, air conditioners cool at a consistent rate regardless of the temperature setting. Lowering the thermostat too much doesn’t cool your home faster—it only forces the system to run longer, wasting energy and driving up your utility bills.

What to Do Instead:

  • Set the thermostat to 78°F when you’re home and higher when you’re away. This is the optimal temperature for energy efficiency and comfort.

  • Use a programmable or smart thermostat to automatically adjust the temperature based on your schedule, ensuring your home stays cool when you need it while saving energy when you don’t.

By setting the thermostat at a reasonable temperature, you reduce energy consumption and prevent unnecessary strain on your AC system.

2. Neglecting Air Filter Maintenance

Many homeowners overlook the importance of regularly changing or cleaning their air filters. Dirty air filters restrict airflow, making your AC system work harder to cool your home. This not only reduces efficiency but can also lead to system overheating and potential breakdowns.

What to Do Instead:

  • Change or clean your filters every 1-3 months to maintain proper airflow and ensure your system operates efficiently.

  • Replace filters more frequently if you have pets, allergies, or live in an area with high levels of dust or pollen.

Clean filters improve indoor air quality, reduce energy costs, and help prevent costly repairs.

3. Closing Vents in Unused Rooms

Some homeowners mistakenly believe that closing vents in unused rooms will save energy by redirecting cool air to other areas of the home. However, closing vents actually disrupts the airflow balance in your AC system, causing it to work harder and potentially leading to ductwork leaks or damage.

What to Do Instead:

  • Keep all vents open to maintain proper airflow throughout your home. Closing vents can cause pressure imbalances, which may damage your ductwork or reduce the efficiency of your system.

  • Consider a zoning system: If you want more control over the temperature in different areas of your home, a zoning system allows you to independently control the cooling in various rooms or zones without disrupting airflow.

By keeping vents open, you ensure your AC system works efficiently and avoids unnecessary strain.

4. Ignoring Regular Maintenance

Skipping regular maintenance is one of the most common mistakes that can lead to decreased efficiency, higher energy bills, and unexpected breakdowns. Routine maintenance, including cleaning coils, checking refrigerant levels, and inspecting electrical components, helps keep your AC system running smoothly.

What to Do Instead:

  • Schedule an annual professional tune-up to ensure your system is working efficiently. A licensed HVAC technician will clean critical components, check refrigerant levels, and inspect the system for potential issues.

  • Perform basic maintenance tasks such as changing air filters, clearing debris from around the outdoor unit, and checking the thermostat settings.

Regular maintenance prevents costly breakdowns and ensures your system runs at peak performance.

5. Letting the Outdoor Unit Get Blocked or Dirty

Your air conditioning system’s outdoor unit (the condenser) needs proper airflow to expel heat from your home. When debris, such as leaves, grass, or dirt, builds up around the unit or vegetation grows too close, it can block airflow and cause the system to overheat, reducing efficiency and potentially leading to damage.

What to Do Instead:

  • Keep the area around the outdoor unit clear: Make sure there is at least two feet of clearance around the unit to allow for proper airflow. Trim back shrubs, trees, or other plants that are too close.

  • Clean the condenser coils regularly: Hose off the outdoor unit’s coils to remove dirt and debris, which can accumulate and reduce the system’s ability to cool your home.

Keeping the outdoor unit clean and unobstructed ensures that your AC can expel heat effectively and run efficiently.

6. Not Using Ceiling Fans

Ceiling fans can help circulate cool air throughout your home, making it feel cooler without overworking your air conditioning system. However, many homeowners overlook the benefits of using fans in conjunction with their AC systems.

What to Do Instead:

  • Use ceiling fans to enhance cooling: Running ceiling fans in occupied rooms creates a wind-chill effect, allowing you to feel cooler even when the thermostat is set a few degrees higher. This reduces the workload on your AC system and saves energy.

  • Turn off fans when leaving the room: Ceiling fans don’t actually lower the air temperature—they just make you feel cooler. Turning them off when you leave the room saves energy.

By using ceiling fans, you can set your thermostat to a higher temperature and still stay comfortable, which reduces energy consumption.

7. Setting the Thermostat Fan to “On” Instead of “Auto”

Many homeowners leave the thermostat fan set to “on,” meaning the fan runs continuously, even when the air conditioner isn’t actively cooling. While this might seem like a good way to circulate air, it can actually waste energy and increase your cooling costs.

What to Do Instead:

  • Set the fan to “auto”: When set to “auto,” the fan only runs during the cooling cycle, which helps maintain efficiency and reduces wear on the system.

  • Use ceiling fans for air circulation: If you want continuous air movement, use ceiling fans instead of setting the AC fan to run non-stop.

Setting the thermostat fan to “auto” ensures that your system runs efficiently, saving energy and prolonging the life of the unit.

8. Cooling an Empty House

Leaving the air conditioning running all day while no one is home is a common mistake that wastes energy. Cooling an empty house results in unnecessarily high energy bills and puts extra strain on your AC system.

What to Do Instead:

  • Use a programmable or smart thermostat to raise the temperature when you’re away and lower it before you return. This allows your home to stay cool when you need it and saves energy when you don’t.

  • Set the thermostat to 85°F or higher when you’re out of the house for an extended period, then adjust it to a comfortable level just before you come home.

Smart thermostats help ensure you’re only cooling your home when necessary, which reduces energy waste and lowers your bills.

9. Ignoring Signs of AC Trouble

Many homeowners ignore warning signs that their air conditioner needs attention, such as unusual noises, poor airflow, or inconsistent cooling. Ignoring these issues can lead to larger problems, including system failure or expensive repairs.

What to Do Instead:

  • Pay attention to warning signs: If you notice strange noises, inconsistent temperatures, or higher-than-usual energy bills, it may indicate a problem with your AC system.

  • Call a professional: Don’t wait for a minor issue to turn into a major breakdown. If you suspect something is wrong, schedule a professional inspection to address the problem before it worsens.

Addressing issues early helps prevent costly repairs and ensures your system continues to run smoothly.


Avoiding these common air conditioning mistakes can help Florida residents save money, improve system efficiency, and extend the life of their AC units. By maintaining proper thermostat settings, keeping your system clean, and scheduling regular professional tune-ups, you can ensure your air conditioner runs efficiently all year long.

If you need help maintaining your air conditioning system or are experiencing issues, AirCo is here to assist. Contact AirCo today to schedule a tune-up or repair and keep your AC system running at peak performance!