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Why is AC Slow?

Published in HVAC Maintenance 2 mins read

The most likely reason your AC is cooling slowly is a dirty air filter.

A dirty air filter restricts airflow, making your AC system work harder and less efficiently to cool your home. Here's a more detailed breakdown:

The Role of the Air Filter

An air filter's primary job is to trap dust, pollen, pet dander, and other airborne particles. This protects the internal components of your HVAC system from damage and also improves your indoor air quality.

How a Dirty Filter Impacts AC Performance

When the filter becomes clogged, it restricts the amount of air that can flow through the system. This has several negative consequences:

  • Reduced Airflow: The AC unit struggles to draw in enough air to cool properly.
  • Increased Energy Consumption: The system has to work harder and longer to achieve the desired temperature, leading to higher energy bills.
  • Overheating: Restricted airflow can cause the AC unit to overheat, potentially leading to component failure.
  • Poor Cooling Performance: The reduced airflow results in less cold air circulating throughout your home, making it feel like the AC is working slowly.

What You Can Do

  1. Check Your Air Filter: Visually inspect your air filter. If it's visibly dirty or clogged, it needs to be replaced.
  2. Replace Regularly: Aim to replace your air filter every 1-3 months, depending on factors like pet ownership, allergies, and the type of filter used. Check it monthly to be sure.
  3. Consider Filter Type: Choose the right filter for your needs. While higher MERV (Minimum Efficiency Reporting Value) filters trap more particles, they can also restrict airflow if not properly matched to your system.
  4. Schedule Maintenance: Regular HVAC maintenance by a qualified technician can help identify and address other potential issues that might be contributing to slow cooling.

In summary, a dirty air filter is a common cause of slow AC performance. Regularly checking and replacing your filter is a simple but effective way to maintain optimal cooling efficiency and prevent damage to your HVAC system.

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