The Ultimate Guide to HVAC Air Filters (MERV Ratings, HEPA, and Pet Hair)
If you use a filter with a MERV rating that is too high (like a MERV 13 or higher on an older system), it will block airflow. This forces your blower motor to work overtime, spikes your energy bill, and can even cause your evaporator coil to freeze.For most homes, a MERV 8 to MERV 11 filter strikes the perfect balance between protecting the equipment and capturing household dust and pollen. If you have a dog shedding constantly, use a standard MERV 8 filter but change it every 30 days rather than the standard 90 days.
If you use a filter with a MERV rating that is too high (like a MERV 13 or higher on an older system), it will block airflow. This forces your blower motor to work overtime, spikes your energy bill, and can even cause your evaporator coil to freeze.For most homes, a MERV 8 to MERV 11 filter strikes the perfect balance between protecting the equipment and capturing household dust and pollen. If you have a dog shedding constantly, use a standard MERV 8 filter but change it every 30 days rather than the standard 90 days.
Choosing the Right Filtration for Your Family
If severe allergies require medical-grade HEPA filtration, a standard 1-inch return grille cannot handle it. At Andes Heating & Air Conditioning, we can install dedicated whole-home air purifiers that integrate directly into your ductwork. Keep these filter facts in mind:
- MERV 8 to 11: The sweet spot for standard residential HVAC systems
- Change Frequency: Replace standard 1-inch filters every 30 to 90 days
- Pet Owners: Change your filters more frequently to prevent hair and dander buildup
- Allergy Sufferers: Ask us about whole-home air purifiers that don't restrict your AC's airflow.
