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Why Your AC Runs Longer During California’s Marine Layer (May Gray) — and What You Can Do About It

May Gray in Southern California brings cooler mornings, overcast skies, and a break from direct heat. On paper, that should mean less demand on your system. Yet many homeowners in Burbank notice the opposite. Their AC seems to run longer, even when temperatures are lower.

The reason comes down to how your system responds to moisture, airflow, and indoor comfort.

Cooler Air Does Not Always Mean Less Work

During the marine layer, outdoor temperatures drop, but humidity levels rise. Your system is not just cooling air. It is also pulling moisture out of it. That process takes time.

Instead of short, powerful cooling cycles, your system may run longer to gradually remove humidity while maintaining the set temperature. The air may already be cool, but until the moisture is reduced, it does not feel comfortable inside.

Humidity Changes How Your Home Feels

When indoor humidity climbs, the air starts to feel heavier. Even at the same temperature, it can feel warmer than it actually is. This is where many homeowners make a costly mistake.

They lower the thermostat to compensate. The cooling system responds by running longer, not because the house is hot, but because it is trying to hit a lower temperature while still managing moisture.

Airflow Becomes More Important Than Usual

During May Gray, airflow issues become more noticeable. If your system is not moving air efficiently, it struggles to remove humidity evenly throughout the home.

This can lead to certain areas feeling damp or stuffy, while others feel fine. The system keeps running to balance things out, which increases runtime without delivering better comfort.

Why Some Homes Feel It More Than Others

Not every home reacts the same way to the marine layer. Layout, insulation, and AC maintenance all play a role.

Factors impacting AC runtime and strain include:

• Homes with older systems may have a harder time managing humidity
• Poor airflow can trap moisture in certain areas
• Dirty filters or coils reduce the system’s ability to remove moisture effectively
• Landscape features and foliage

In certain situations, the system runs longer because it is working against internal limitations and environmental factors that go beyond the outdoor temperature.

What Actually Helps Reduce Runtime

Lowering the thermostat is not the solution during marine layer conditions. The focus should be on helping your system operate more efficiently under higher humidity.

Tips to prevent extended AC use and strain:

• Keep filters clean so airflow is not restricted
• Use consistent thermostat settings instead of frequent adjustments
• Run the system long enough to complete full cooling cycles
• Address airflow issues that prevent even distribution

These adjustments help your system remove moisture more effectively, which improves comfort without forcing longer runtimes.

Stay Comfortable in Burbank, CA Without Overworking Your System

At Certified Service, we help homeowners in Burbank, CA keep their systems running efficiently through changing conditions like May Gray. If your AC is running longer than expected or your home feels humid despite lower temperatures, it may be time for a professional evaluation.

Contact Certified Service today to schedule AC service and keep your home comfortable without unnecessary energy use.