08/30/2026
🚨 Your AC system can be running perfectly and STILL not be cooling your home the way it should.
One thing we’re finding more and more on service calls is poorly sealed ductwork and improperly installed plenums.
Here are a few things that can seriously hurt system performance:
🔹 Unsealed plenums & duct connections — air escapes before it ever reaches the rooms you’re trying to cool.
🔹 Flex duct runs exceeding 15 feet — long runs can create excessive static pressure and reduce airflow, especially when the duct is improperly supported, stretched, or has excessive bends.
🔹 Poorly sealed flex duct connections — even small leaks throughout a duct system can add up to a significant loss of conditioned air.
🔹 Low Delta-T — a properly operating system should typically have a meaningful temperature difference between the return and supply air. When you’re seeing under a 16°F difference, poor duct design, air leakage, inadequate airflow, or other installation issues can be contributing to the problem. This is why checking the duct system is just as important as checking the equipment itself.
Your equipment can be working perfectly and still perform poorly if the duct system isn’t installed and sealed properly.
That’s why we don’t just look at whether the equipment turns on and blows cold air. We look at the whole system — airflow, temperature split, ductwork, connections, static pressure, and overall operation.
💨 Proper ductwork = proper airflow = better comfort and efficiency.
If your AC runs constantly, some rooms stay hot, airflow seems weak, or your system isn’t producing the temperature difference it should, your ductwork may be worth having checked.
📞 Cypress Heating & Cooling
Fast, reliable HVAC service throughout CENLA.
Same-day service when available.
