When a Georgia summer hits and your air conditioner is blowing warm air, every minute feels like an eternity. Whether your system is running but not cooling, or it’s barely keeping up with the heat, there’s usually a fixable reason behind it. Here are the seven most common causes of an AC not cooling properly in Kennesaw homes — and what you can do about each one.
1. Your Air Filter Is Clogged
A dirty air filter is the most common culprit. When airflow gets blocked, your system has to work harder and cools less effectively. Check your filter first. If it’s grey and matted, replace it. Most filters need changing every 30–90 days, especially during peak cooling season.
2. Your Thermostat Is Set Incorrectly
It sounds simple, but it happens more than you’d think. Make sure your thermostat is set to COOL — not FAN or HEAT. Also check that the temperature setting is actually below the current indoor temperature. If someone changed the settings or the thermostat batteries are low, your system may not respond the way you expect.
3. Your AC Is Low on Refrigerant
Refrigerant is what your system uses to pull heat out of your home’s air. If your AC is blowing warm air or running constantly without cooling, low refrigerant could be the reason. This usually signals a leak — and it requires a licensed HVAC technician to diagnose and repair. Refrigerant doesn’t just “run out.” If levels are low, there’s a leak that needs to be found and fixed.
4. The Condenser Coils Are Dirty
Your outdoor unit houses the condenser coils, which release heat pulled from inside your home. When these coils get coated in dirt, grass clippings, or debris, they can’t release heat properly. The result? Your air conditioner keeps running but your home stays warm. Gently clearing debris from around the unit helps, but a professional coil cleaning is often needed for full efficiency.
5. Your AC Unit Is the Wrong Size
An undersized system will run all day and still struggle to cool a larger home. An oversized unit will short-cycle — turning on and off too quickly — and leave your home feeling humid and unevenly cooled. If your AC has never kept up well, or if it’s been upgraded without a load calculation, sizing could be the root cause.
6. The Evaporator Coil Is Frozen
If your indoor air handler’s evaporator coil freezes over, airflow becomes severely restricted. Signs include ice on the refrigerant line, reduced airflow from vents, or water dripping near your air handler. Turn off the system and let it thaw (this can take a few hours), then check for a dirty filter or low refrigerant — both common causes of a frozen coil. If it keeps happening, call a technician.
7. Your Ductwork Has Leaks
Even a well-functioning AC unit can’t cool your home efficiently if the cooled air is escaping through leaky ducts. In fact, the U.S. Department of Energy estimates that leaky ducts can reduce efficiency by 20–30%. If some rooms cool fine while others stay warm, duct leaks or blockages may be to blame.
HVAC Troubleshooting in Kennesaw: Quick Checklist
Before calling for AC repair in Kennesaw, run through these quick checks:
- ✅ Replace the air filter if it’s dirty
- ✅ Confirm thermostat is set to COOL and below room temperature
- ✅ Check the circuit breaker for your air handler and outdoor unit
- ✅ Clear debris from around the outdoor condenser unit
- ✅ Look for ice on the refrigerant line near the indoor unit
- ✅ Listen for unusual noises — grinding or clicking can signal mechanical issues
If none of these solve the problem, it’s time to call a professional.
Frequently Asked Questions
Why is my AC running but not cooling the house? The most common reasons are a clogged air filter, low refrigerant, dirty condenser coils, or a frozen evaporator coil. Start by replacing your filter and checking the thermostat. If the problem continues, a licensed HVAC technician can diagnose refrigerant or coil issues that aren’t visible without proper tools.
How long should it take for an AC to cool a house? In normal conditions, a properly sized AC should lower your home’s temperature by about 1–2 degrees per hour. If your system runs for several hours without making a noticeable difference, something is likely wrong — whether it’s airflow restriction, refrigerant levels, or an equipment issue.
Can I fix my AC not cooling on my own? Some fixes are DIY-friendly: replacing a dirty filter, clearing debris from the outdoor unit, resetting the thermostat, or letting a frozen coil thaw. However, refrigerant handling, electrical diagnostics, and coil cleaning typically require a licensed professional. Attempting refrigerant work without certification is also illegal under EPA regulations.
Is Your AC Still Not Cooling? Call Wade Heating and Air.
If you’ve gone through the checklist and your air conditioner is still blowing warm air, don’t wait it out in the Georgia heat. Wade Heating and Air serves Kennesaw and the surrounding area with fast, honest AC repair. Our licensed technicians can diagnose the problem the same day and get your system back to doing what it’s supposed to do — keeping your home cool and comfortable. Call us today or schedule your AC repair appointment online.
Posted on June 25, 2026 | Published by Ignite Local | Related Local Business
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