M & M Heating & Air Conditioning Service - Modesto's Qualified HVAC Repair

It could be either. A severely clogged air filter is the most common culprit, restricting airflow and making your system work harder. We recommend checking and replacing your filter monthly during peak seasons. If that doesn't help, the issue could be a failing blower motor or a blockage in your ductwork. Our technicians can quickly diagnose the root cause and provide a lasting fix to restore proper airflow.

Key signs include weak or no airflow from your vents, unusual humming or screeching noises from the indoor unit, the system frequently overheating and shutting off, or a complete failure to start. These issues are common in Modesto, especially with older systems working hard through our hot summers. Addressing a failing motor promptly can prevent further damage to other components.

We generally recommend checking your filter every month and replacing it at least every 90 days. However, with Modesto's dusty environment and frequent agricultural activity, you may need to change it more often, especially during high-use seasons. A clean filter protects your blower motor, improves efficiency, and is essential for good indoor air quality for your family.