Your AC is Running But The House Is Still Warm

This is the most frequent call we get from homeowners who are puzzled by their cooling system’s behavior. The unit outside is spinning, the indoor fan is blowing, but the air coming from the registers just isn’t cold. In the humid environment we have around Cookeville and the surrounding areas, this often indicates a problem with heat transfer.

If your evaporator coil is covered in dust or your outdoor condenser is clogged with debris, the system cannot release the heat it picks up from inside your home. It might also mean your refrigerant levels are low, which prevents the system from absorbing heat in the first place. A technician needs to check the pressures and the cleanliness of both coils to determine why the air isn’t reaching the right temperature.

Strange Noises Coming From Your AC Unit

Your air conditioner should be a relatively quiet part of your home’s background noise. If you start hearing high-pitched squealing, it usually points to a belt that is slipping or a motor bearing that is starting to seize up. These sounds are a direct warning that a moving part is about to fail completely.

A loud banging or clanking sound often means something has come loose inside the blower assembly or the outdoor fan. Grinding noises are particularly concerning because they often involve the compressor, which is the heart of your entire system. If you hear any of these sounds, it is best to shut the system off immediately to prevent further internal damage before we arrive.

Water Leaking Around Your Indoor or Outdoor Unit

Finding a puddle of water around your indoor air handler or furnace is never a good sign. Air conditioners do more than just cool the air; they also remove a massive amount of moisture from the humid Tennessee atmosphere. All that water has to go somewhere, and it is designed to flow down a condensate drain line and out of your house.

If that line gets clogged with algae, dust, or debris, the water has nowhere to go but back into your home. This can cause significant damage to your floors, drywall, and ceilings if the unit is located in an attic or crawlspace. We also check for ice buildup on the coils, which can melt and overflow the drain pan if the system is struggling with airflow or refrigerant issues.

Your System Turns On and Off Constantly

This behavior is known as short-cycling, and it is very hard on your equipment. An air conditioner uses the most electricity and experiences the most wear and tear during the first few minutes of a cycle. If your system is starting up and shutting down every few minutes, it never stays on long enough to actually dehumidify your home.

Short-cycling can be caused by anything from a faulty thermostat or a failing sensor to a more serious issue like an oversized system or a refrigerant leak. It leads to incredibly high energy bills and will significantly shorten the lifespan of your compressor. We use diagnostic tools to track the cycle and find exactly which safety switch or component is triggering the premature shutdown.

Common AC Problems We Fix in the Upper Cumberland

Refrigerant Leaks and Low Freon Levels

A common misconception is that air conditioners use up refrigerant like a car uses gas. In reality, your AC is a closed system, and the refrigerant should stay at the same level for the life of the unit. If you are low on refrigerant, it means there is a hole or a crack somewhere in the copper lines or the coils.

Because the system operates under high pressure, even a tiny pinhole leak will eventually lead to a system that cannot cool. Flatt’s Heating and Cooling technicians don’t just add more refrigerant and leave; we find the source of the leak. We use electronic leak detectors to pinpoint the problem so we can discuss the best way to seal the system and prevent the problem from happening again.

Failed Capacitors and Electrical Components

If you hear your outdoor unit making a clicking or humming sound but the fan or compressor won’t start, you likely have a bad capacitor. Capacitors act like large batteries that give the motors the extra jolt of energy they need to start spinning. They are very sensitive to heat and power surges, which makes them a common failure point during the busiest parts of the year.

We also frequently see burnt contactors, which are the electrical switches that tell the unit to turn on. The silver points on these switches can become pitted or “welded” shut over time due to electrical arcing. Replacing these parts is a standard repair that can get your system back up and running very quickly once we identify the failed component.

Clogged Condensate Drain Lines

The humidity in the Sparta and Cookeville area is high enough that an air conditioner can produce several gallons of water in a single day. This moisture mixes with dust and creates a thick sludge that eventually blocks the narrow PVC drain pipes. When the water can’t exit, it backs up into the primary or secondary drain pan.

Many modern systems have a safety float switch installed in the drain pan. When the water rises too high, the switch flips and cuts power to the entire AC unit to prevent a flood. If your system suddenly won’t turn on at all, a clogged drain is often the culprit. We clear these lines thoroughly and can show you how to keep them clean throughout the year.

Failing Blower Motors and Fan Blades

The indoor blower motor is responsible for moving the cooled air through your ductwork and into your living spaces. If this motor fails or becomes sluggish, you will notice very little air coming out of your vents. You might also notice the indoor coil starting to freeze over because there isn’t enough warm air passing over it to keep the moisture from turning into ice.

Outdoor fan motors face the elements year-round and can eventually fail due to rain, dust, or simple mechanical wear. If the outdoor fan stops spinning, the system cannot dissipate the heat it removed from your home. This causes the internal pressure to skyrocket, which will eventually trip a high-pressure safety switch or damage the compressor.