As an HVAC expert, I have seen firsthand the consequences of neglecting to change your furnace filter regularly. It may seem like a small and insignificant task, but it can have a significant impact on your HVAC system and your overall health. In this article, I will explain why changing your furnace filter is crucial and the potential consequences of not doing so. One of the main problems that arise from not changing your furnace filter is system inefficiency. When the filter becomes clogged with dirt, dust, and other particles, it restricts the airflow and makes it harder for your HVAC system to function properly.
This leads to higher energy bills as your system works harder to maintain the desired temperature. Additionally, a clogged filter can also result in inadequate air quality, as it is no longer able to trap contaminants effectively. But the consequences of not changing your furnace filter go beyond just inefficiency and higher bills. If the filter is unable to trap contaminants, they can circulate back into the air that you and your family breathe. This can lead to immediate problems such as headaches, itchy eyes or throat, and dizziness.
And if these problems persist over time, they can have long-term effects on your health, including respiratory illness, heart disease, or even cancer. Another issue that arises from not changing your furnace filter is the risk of system failure. As the filter becomes more and more clogged, it will eventually reach a point where air cannot pass through it at all. This lack of airflow can cause the temperature inside the system to rise, triggering the limit switch to turn off the furnace to prevent overheating. While this may temporarily solve the problem, it does not address the root issue. Without a new air filter, every time you turn on your furnace, it will overheat and shut off again.
This is known as a short cycle, and it can cause significant damage to your HVAC system over time. So, how often should you change your furnace filter? The general recommendation from air filter manufacturers and HVAC companies is every 90 days or 3 months. However, this can vary depending on the type of filter you are using and your specific HVAC system. It's essential to follow the recommended schedule to ensure that your filter is always working at its optimal performance. There are various types of air filters available, but the only ones that effectively trap allergens and spores are high-efficiency particle (HEPA) filters. These filters are installed in the return duct, meaning that all air entering the furnace must first pass through the filter.
This ensures that the air in your home is clean and free of harmful particles such as mold, pet dander, and bacteria. When it comes to choosing the right air filter for your HVAC system, pay attention to the MERV rating. MERV stands for Minimum Efficiency Reporting Value, and it measures how effectively a filter can prevent dust and other contaminants from passing through and reaching the airflow. Filters with higher MERV values are more efficient at trapping small particles than those with lower values. It's important to note that while there are high-efficiency filters designed to filter out small bacterial, mold, and fungal particles, standard MERV 8-11 filters only block larger particles like dust, dirt, and hair. Using an air filter with a higher MERV rating than recommended by your HVAC system manufacturer can actually affect its performance. If you haven't changed your furnace filter in a while, it's crucial to determine what type of filter you need and replace it as soon as possible.
Neglecting this simple maintenance task can have severe consequences for your HVAC system and your health. So, make sure to mark your calendar and change your furnace filter regularly to keep your system running smoothly and your air clean.
