Common AC Problems and How to Fix Them
When summer temperatures in Texas climb into the triple digits, your air conditioner has to work harder than ever. Even a small issue can turn into a bigger problem quickly, leaving your home uncomfortable and your system under strain. The sooner you can spot the warning signs, the easier it is to fix them and prevent costly repairs.
This guide will walk you through the most common AC problems we see, what they often mean, and when it’s time to call us for help. Our goal is to give you the knowledge to act early, protect your system, and keep your home cool through the hottest months of the year.
At-a-Glance Checklist: Watch for These Signs
Catching AC issues early can save you time, money, and a lot of discomfort in the middle of summer. Keep an eye out for these common warning signs:
- Weak or no airflow – Air isn’t moving through the vents the way it should.
- Strange noises or odors – Grinding, buzzing, or musty smells can signal trouble inside the system.
- System not turning on – Even after checking your thermostat and breaker.
- Water leaks inside or outside – Moisture where it shouldn’t be could point to a clogged drain line or other issue.
- Constant cycling – The system turns on and off more often than normal.
- High energy bills or humidity issues – Cooling costs or indoor humidity are creeping up without explanation.
If you notice one or more of these, it’s best to investigate right away before the problem gets worse.
Breakdown of Common Air Conditioning Problems and What They Mean
Spotting a problem is one thing, but understanding what it might mean is what helps you decide whether it’s a quick fix or something that needs professional attention. Below, we break down each of the most common AC issues, why they happen, and the next steps to take if you notice them in your home.
Weak or No Airflow:
If the air barely moves through your vents, the system could have a clogged filter, blocked ductwork, or a failing blower motor. Low refrigerants can also reduce airflow. We can inspect the system, clear blockages, and get your air moving again.
Strange Noises or Odors:
Grinding, buzzing, or squealing often points to loose or worn parts, while musty smells can signal mold in the system. A burning odor may mean electrical trouble. Turn the system off and let us check it before it causes more damage.
System Not Turning On:
Sometimes this is as simple as a tripped breaker or dead thermostat batteries. If you’ve ruled those out, the issue could be with the wiring, control board, or a safety switch. We’ll pinpoint the cause and get it running.
Water Leaks Inside or Outside:
Moisture around your indoor unit or pooling near the outdoor condenser is often caused by a clogged condensate drain line, a frozen coil thawing, or a broken pump. Clearing the line and checking the system prevents water damage.
Constant Cycling:
If the AC turns on and off more than it should, the thermostat may be faulty, the system might be oversized for your home, or the coils could be dirty. We’ll determine the source and correct it so your AC runs smoothly.
High Energy Bills or Humidity Issues:
A sudden spike in your energy bill or a sticky feeling indoors can mean your system is straining to keep up. This might be due to worn parts, poor airflow, or an aging unit. We can tune up your system or recommend upgrades to improve performance.
Quick Air Conditioning Common Issues DIY Checklist (When It’s Safe)
There are a few simple checks you can do yourself that might get your system running again or at least rule out small issues before scheduling a repair.
- Replace the air filter – A dirty filter can cause weak airflow, frozen coils, and higher energy bills.
- Check the thermostat – Make sure it’s set to “cool” and the temperature is set lower than the room. Replace the batteries if it has them.
- Reset the breaker – If the breaker has tripped, reset it once and see if the system comes back on. If it trips again, stop and call us.
- Clear the outdoor unit – Remove leaves, grass, or debris within two feet of the condenser to help airflow.
- Open vents and registers – Closed or blocked vents can reduce airflow and make the system work harder.
If these steps don’t solve the problem or you notice strange sounds, burning smells, or water leaks, it’s time to bring in the professionals. Some issues, like refrigerant leaks or electrical faults, need immediate attention from our team to prevent further damage.
FAQs
What is the most common part to fail on an AC unit?
The most common part to fail is the capacitor, which helps start and run the compressor and fan motors. Over time, capacitors can wear out, causing your system to struggle or stop working. Regular maintenance can help detect early signs of failure.
Why is my AC running but not cooling?
If your AC is running but not cooling, it could be due to a clogged air filter, low refrigerant, dirty coils, or blocked airflow. Sometimes, thermostat issues or duct leaks are also to blame. A professional inspection ensures the correct problem is identified and fixed.
How long should AC run on a 90 degree day?
On a 90-degree day, an efficient AC system may run 15–20 minutes per cycle, about two to three times an hour. If it’s running continuously or shutting off too quickly, it may indicate undersizing, poor insulation, or maintenance issues that should be checked.
What’s the 20 rule for air conditioning?
The “20-degree rule” means that air conditioners are designed to cool indoor air by about 20 degrees below the outdoor temperature. For example, if it’s 95°F outside, your AC will typically lower indoor temperatures to around 75°F. Pushing beyond this limit can strain the system.
Can I overwork my AC?
Yes, an AC can be overworked if it runs constantly without breaks, especially during extreme heat. This can lead to worn parts, higher energy bills, and reduced system life. Routine maintenance, clean filters, and proper thermostat settings help prevent overworking and keep your system efficient.
When to Contact Warren Mechanical HVAC
Some AC issues can be solved with a quick filter change or thermostat check, but others need a professional touch before they turn into bigger problems. If you notice strange noises, unusual smells, repeated breaker trips, refrigerant leaks, or your system is still struggling after basic troubleshooting, it’s time to call us.
We offer fast, local service across Central Texas and know how to get systems back up and running during the hottest days of the year. Our team will diagnose the problem, explain your options, and make sure you understand every step before we start work.
Don’t wait for a small issue to become a major repair. Call Warren Mechanical at (713) 568-3358 or visit www.warrenmechanical.net to schedule your service today.
