What MERV rating filter should I use

Most Ottawa homes should use MERV 8-11 filters, which provide excellent filtration without restricting airflow in your HVAC system. MERV 8 captures dust, pollen, and pet dander effectively, while MERV 11 also filters out smaller particles like smoke and smog.

MERV ratings explained: The scale runs from 1-16, with higher numbers capturing smaller particles. MERV 1-4 are basic fiberglass filters that barely filter anything. MERV 5-8 are pleated filters good for most homes. MERV 9-12 offer superior filtration for families with allergies or pets. MERV 13-16 are hospital-grade filters that can restrict airflow in residential systems.

For Ottawa's climate and air quality, MERV 8 works well for most homes, providing good filtration without straining your furnace fan. If you have allergies, asthma, or pets, consider MERV 10-11. These higher-efficiency filters capture more allergens while still allowing proper airflow through your system.

Avoid going too high - MERV 13+ filters can reduce airflow significantly in residential systems, making your furnace work harder and potentially shortening its lifespan. Your system wasn't designed for that level of restriction. Also, change filters every 1-3 months depending on usage, pets, and dust levels in your home.

Check your furnace manual for manufacturer recommendations, as some newer high-efficiency units can handle higher MERV ratings better than older systems. When in doubt, start with MERV 8 and monitor your system's performance. If you notice reduced airflow or your furnace cycling more frequently, drop down to a lower MERV rating.

For personalized filter recommendations based on your specific HVAC system and indoor air quality needs, Ottawa HVAC Pro can assess your setup during a maintenance visit.

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