Top 5 Common AC Problems and How to Fix

Common AC Problems Introduction

If your air conditioner isn’t keeping up with the Texas heat, you’re not alone. Most homeowners will run into AC trouble eventually — sometimes at the worst possible time, like the middle of a July heatwave. The good news is that many common AC problems are preventable and, in some cases, surprisingly easy to fix.

Understanding the most frequent issues with residential HVAC systems can save you from the stress of unexpected breakdowns. Catching a problem early can reduce repair costs, extend the life of your system, and help your home stay comfortable year-round. From weak airflow to strange noises or short cycling, recognizing the warning signs helps you act fast — before things escalate into a full system failure.

In this post, we’ll go over the top five AC problems we see most often in the field and walk through the symptoms, causes, and solutions. Whether you’re dealing with an aging system or just want to be prepared, this guide can help you troubleshoot quickly and decide when it’s time to call in the pros.

1. AC Not Cooling Properly

If your AC is running but the air isn’t cold, several issues could be at play:

Possible Causes

• Dirty or clogged air filter
• Low refrigerant levels
• Blocked or leaking ductwork
• Thermostat set incorrectly or malfunctioning

Quick Fixes

• Check and replace your air filter
• Ensure the thermostat is set to “cool” and at the right temperature
• If airflow seems weak, have your ducts and refrigerant levels inspected by a professional

2. AC Making Strange Noises

Unusual sounds often point to parts wearing out or coming loose. Listen for:

Common Noises

• Rattling or banging: Loose parts or debris in the unit
• Squealing: Belt or motor issues
• Hissing: Possible refrigerant leak

What to Do

• Turn off the unit to avoid further damage
• Call a licensed HVAC technician to inspect and repair the issue

3. Short Cycling (Turns On and Off Too Often)

If your system kicks on, runs briefly, then shuts off again, it’s short-cycling.

Likely Causes

• Oversized unit for your space
• Dirty air filter
• Thermostat sensor issues

Solutions

• Make sure your filter is clean
• Move heat sources away from the thermostat
• If the problem continues, schedule a professional evaluation

4. Water Leaking Around the Unit

AC units remove moisture from the air, but that water is supposed to drain properly. If it’s pooling, something’s wrong.

Common Causes

• Clogged condensate drain line
• Rusted or cracked drain pan
• Frozen evaporator coil

DIY Tip

• Turn off the unit and clear the drain line if you can safely access it
• If water keeps leaking or you see ice on the unit, call a technician

5. Weak Airflow

Poor airflow can make it feel like your AC isn’t doing anything, even if it’s running.

Possible Causes

• Dirty or aging blower motor
• Blocked return or supply vents
• Ductwork issues

Steps to Take

• Make sure all vents are open and unobstructed
• Replace your air filter
• If airflow still feels weak, schedule a service call for duct or blower inspection

Common AC Problems Final Thoughts

Even the most reliable air conditioning system can run into trouble — especially in a hot, humid climate like ours. The key is to stay proactive. A dirty air filter, loose part, or clogged drain may not seem like a big deal, but over time, these small issues can lead to bigger repairs and even full system failure.

Knowing what to look for gives you an edge. When you catch problems early, you reduce strain on your system, lower your energy bills, and avoid the discomfort of a mid-summer breakdown. Keep a maintenance routine, replace filters regularly, and don’t ignore signs like strange sounds, weak airflow, or uneven cooling.

And when you do need help, choose a company you can trust. At Reids AC & Heat, our licensed technicians are ready to diagnose issues quickly, offer honest recommendations, and get your system back to peak performance — often the same day. Whether it’s a small fix or a full replacement, we’re here to keep your home cool and your stress levels low.