FurnaceHVACJanuary 13, 2024by Chris0Choosing the right air filter for your hvac system

When choosing a furnace or HVAC filter, the decision often involves selecting the appropriate MERV (Minimum Efficiency Reporting Value) rating. MERV 4 filters are relatively basic, and there are specific situations where they might be preferred over fiberglass filters with a lower MERV rating. Here are some reasons why you might choose a MERV 4 filter over a fiberglass filter:

1. Basic Filtration Needs: MERV 4 filters are considered low-efficiency filters, suitable for capturing larger particles such as dust, lint, and pollen. If your primary concern is basic particle filtration without the need for advanced allergen or microbial control, a MERV 4 filter may be sufficient.
2. Less Airflow Resistance: MERV 4 filters generally have lower airflow resistance compared to higher MERV-rated filters. This means that the HVAC system doesn’t have to work as hard to push air through the filter, potentially leading to improved energy efficiency and lower utility costs.
3. Cost-Effective: MERV 4 filters are typically more affordable than higher-rated filters. If cost is a significant factor, and you have minimal concerns about air quality beyond basic particle filtration, a MERV 4 filter could be a cost-effective choice.
4. Less Strain on HVAC Systems: Filters with higher MERV ratings can restrict airflow more than lower-rated filters. If your HVAC system is older or not designed to handle higher-resistance filters, using a MERV 4 filter can help prevent excessive strain on the system.
5. Less Frequent Replacement: Higher MERV-rated filters often require more frequent replacement due to their finer filtration, which can result in quicker clogging. MERV 4 filters, being less restrictive, may need replacement less frequently, potentially reducing maintenance costs and efforts.

It’s important to note that while MERV 4 filters may have specific advantages, they are not suitable for all situations. If indoor air quality is a significant concern, or if there are specific allergens or contaminants you wish to address, a higher MERV-rated filter might be more appropriate. It’s crucial to consider your specific needs, the recommendations of your HVAC system’s manufacturer, and any health considerations when selecting a furnace filter. Regular filter replacement and maintenance are key regardless of the MERV rating to ensure the proper functioning of your HVAC system and maintain indoor air quality.