When seasonal heat hits Columbia, MO, there's nothing worse than an AC unit giving out when you need it most. The Missouri humidity and heat make everywhere feel like an unwanted trip to a sauna.
Top 5 Common Causes of Air Conditioner Malfunctions—And How to Fix Them
Dated: March 26 2026
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When seasonal heat hits Columbia, MO, there's nothing worse than an AC unit giving out when you need it most. The Missouri humidity and heat make everywhere feel like an unwanted trip to a sauna. Whether you're settling into a new home or prepping a property for sale, a functioning air conditioner is a must. Here are five of the most common issues that could cause your AC to stop working—and what you can do to fix them.
1. Dirty or Clogged Air Filters
The Problem: Over time, dust and debris clog up your air filter, restricting airflow and making your AC work overtime—or shut down altogether.
The Fix: Replace or clean your air filter every 1–3 months, especially during peak use seasons. It’s cheap, easy, and extends the life of your system.
2. Refrigerant Leaks
The Problem: Low refrigerant levels can cause your unit to blow warm air, ice over, or even break down entirely.
The Fix: Call an HVAC professional to inspect and repair the leak. DIY fixes can be dangerous and usually don’t address the root cause.
3. Thermostat Issues
The Problem: If your thermostat isn’t reading temperatures correctly or communicating with the AC unit, your system may short cycle or not turn on at all.
The Fix: First, try replacing the batteries or resetting the thermostat. If that doesn’t help, it might be time for an upgrade to a smart thermostat.
4. Dirty Condenser Coils
The Problem: The outdoor condenser coil releases heat from your home, but when it’s covered in dirt, the system overheats and struggles to cool effectively.
The Fix: Turn off power to the unit and gently hose down the coils to remove surface grime. For a deeper clean, call in a pro.
5. Electrical or Capacitor Failures
The Problem: Your AC unit relies on several electrical components. A failed capacitor or tripped breaker can shut the whole system down.
The Fix: Check your circuit breaker first. If it's not a simple flip, leave electrical repairs to licensed technicians to avoid further damage—or injury.
Stay Cool—And Stay Ahead of Home Maintenance
Keeping your AC in top shape not only ensures comfort but can boost your home's appeal and value. Whether you're buying, selling, or just looking to maintain your investment, a trusted REMAX Boone Realty agent is here to guide you every step of the way.
Conor Byrne
I'm Conor, a Real Estate Marketing Design Coordinator specializing in creative strategy and brand development. I lead the design efforts behind our marketing campaigns and social media presence, creat....
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