Living in Dandridge, TN means being no stranger to heat and humidity. Whether it’s a sunny day with temperatures creeping into the 80s or a muggy evening where the air feels thick, a functioning air conditioner is less of a luxury and more of a necessity. But when your AC suddenly stops working or isn’t cooling like it should, panic can set in fast.
Before you reach for the phone to call a technician, there are several practical steps you can take on your own. In fact, many AC issues stem from minor problems that are surprisingly easy to fix at home. This guide will walk you through a series of DIY checks and fixes you can try before calling in the professionals—saving you time, stress, and potentially even money.
Let’s take a look at some of the most common AC problems homeowners face and what you can do about them yourself.
Check Your Thermostat Settings
It may sound obvious, but thermostat errors are one of the most common causes of cooling issues. The U.S. Department of Energy (DOE) reports that incorrect thermostat settings or malfunctions can cause up to 10% of unnecessary service calls.
DIY Fix:
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Make sure your thermostat is set to “cool” and not “fan” or “heat.”
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Ensure the temperature is set lower than the current room temperature.
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If it’s a programmable thermostat, double-check that the schedule hasn’t been changed.
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Try replacing the batteries, especially if it’s a battery-operated model.
If your thermostat is older or unresponsive, consider upgrading to a smart thermostat in the future. These models offer better control and energy savings—but always have a professional handle installation.
Inspect and Replace the Air Filter
Clogged air filters are a top reason for poor AC performance. When the filter gets too dirty, it restricts airflow and causes your system to work harder than it should. According to the EPA, replacing a dirty filter can lower your air conditioner’s energy consumption by 5% to 15%.
DIY Fix:
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Locate the return air filter—this is usually near the blower unit or in a wall or ceiling vent.
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If it looks dark and dusty, replace it.
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Filters should generally be replaced every 30–90 days, depending on usage and air quality.
Clean air filters don’t just improve performance; they also extend your AC unit’s lifespan and improve indoor air quality.
Clear the Area Around the Outdoor Unit
Your AC’s condenser unit—the part that sits outside—needs room to breathe. Debris like leaves, grass, and even overgrown bushes can block airflow and reduce efficiency.
DIY Fix:
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Turn off power to the unit.
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Clear at least 2–3 feet of space around it.
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Use a hose (on a gentle setting) to rinse off dirt or debris on the fins.
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Avoid bending the fins; if you do, use a fin comb to straighten them.
Proper airflow around the condenser can significantly improve your system’s cooling ability.
Inspect the Circuit Breaker and Power Switches
Sometimes an AC that won’t turn on is simply a power issue. This can occur after a power surge or if a breaker has tripped.
DIY Fix:
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Check your electrical panel for any tripped breakers. If the AC breaker is off, flip it back on.
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Make sure the emergency shut-off switch (usually located near the outdoor unit) hasn’t been turned off by accident.
If the breaker trips again shortly after resetting it, that’s a sign of a deeper issue. It’s time to stop and call a professional.
Unclog the Condensate Drain Line
Your AC system removes moisture from the air, which then exits your home through a condensate drain line. If this line becomes clogged, it can cause water to back up and trigger a safety shutoff switch—making it seem like the system is broken when it’s actually protecting itself.
DIY Fix:
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Locate the drain line (usually a white PVC pipe near the indoor unit).
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Remove the cap and use a wet/dry vacuum to suction out any clogs.
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You can also flush the line with distilled vinegar or a mix of water and bleach.
Keeping this line clean can prevent water damage and system shutdowns.
Listen for Unusual Sounds
A normally functioning AC is relatively quiet. If you hear grinding, squealing, or rattling, that could indicate a mechanical issue, loose parts, or debris stuck in the fan.
DIY Fix:
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If the noise sounds like loose metal or screws, check access panels to ensure they are tightly secured.
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Remove any visible debris near the fan blades if it’s safe to do so.
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If the noise continues, turn the system off and contact a technician.
Addressing strange noises early can prevent more serious damage to the system.
Feel the Airflow
Even if your AC turns on, weak airflow could mean something is blocking the ductwork or blower motor.
DIY Fix:
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Walk around your home and check vents. Make sure they’re open and unobstructed by furniture or rugs.
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Remove the vent covers and clean them if there’s visible dust buildup.
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If airflow seems weak throughout the home, it may be a blower or duct issue that needs professional service.
Good airflow is key to even cooling and energy efficiency.
Reset the System
Sometimes, all your system needs is a simple reset to fix a minor electronic glitch.
DIY Fix:
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Turn off your thermostat.
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Turn off the breaker to your AC system for 60 seconds.
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Turn the breaker back on and wait a few minutes.
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Turn your thermostat back to “cool” and set it a few degrees below the room temperature.
This method works like a “reboot” and can fix small control board errors or sensor miscommunications.
Check for Ice on the Coils
Frozen evaporator coils can prevent your AC from cooling properly. Low refrigerant, poor airflow, or even dirty coils can lead to ice buildup.
DIY Fix:
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Turn off the AC and switch the thermostat to “fan” mode to help melt the ice.
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Wait several hours for the ice to thaw before restarting.
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Check your filter and airflow around the system—these are often the culprits.
If it freezes again shortly after restarting, call a technician to inspect refrigerant levels and other internal components.
Know When It’s Time to Call a Technician
While DIY fixes are great for minor problems, it’s important to recognize when the issue is beyond your expertise. Here are some signs that it’s time to bring in a licensed HVAC professional:
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Strange or burning odors coming from vents
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Electrical issues or frequently tripped breakers
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Warm air blowing from vents despite normal settings
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System cycles on and off too frequently (short cycling)
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AC runs constantly but doesn’t cool your home
Leaving serious issues unresolved can lead to larger system failures and higher energy bills. According to ENERGY STAR, routine maintenance and timely repairs can improve your system’s efficiency by up to 20%.
Prevent Future AC Problems With Routine Maintenance
One of the best ways to minimize unexpected breakdowns is by scheduling regular maintenance. Professional inspections can catch small issues before they become big, costly problems. Annual servicing includes cleaning coils, checking refrigerant levels, tightening electrical connections, and more.
Data from the National Association of Home Builders shows that with regular maintenance, the average central AC system can last 15–20 years—compared to 10–12 years without it.
For AC Services in Dandridge, TN, Contact Budget Heating & Air Conditioning Today
If you’ve tried the steps above and your AC is still underperforming, don’t worry—you’re not alone. Budget Heating & Air Conditioning is here to help. Our experienced technicians are trained to diagnose and repair all types of air conditioning issues quickly and professionally.
We understand how important a reliable cooling system is to your comfort, especially in Dandridge’s humid climate. When you choose us, you’re choosing a team committed to your satisfaction and long-term peace of mind. Whether it’s a minor fix, a refrigerant leak, or a full system issue, we’re equipped to get your system running like new.
Let us take the guesswork out of your AC problems. If your DIY fixes haven’t done the trick, reach out to Budget Heating & Air Conditioning today and let the pros handle it with care.