6/10

When the air is humid, particles cling more easily to filter media. That makes it more likely for high efficiency filters to clog and reduce furnace performance.

The FilterBuy MERV 8 Pleated Furnace Filter offers enough stopping power for pollen, allergens and mold spores while providing plenty of air circulation for the furnace. The synthetic fiber filter media prevents mold colonies from growing, a concern in humid environments.

7/10

Pets bring joy to the household, but they also bring pet hair, dander and odors. The Aerostar MERV 11 Pleated Air Filter can filter out particles as small as one micron. Because it does this with an electrostatic charge, it also provides plenty of airflow for the furnace.

On the mid to low end of the price scale, this filter needs replacing every 60 to 90 days — more frequently during periods of peak usage.

8/10

Yes, bluetooth-enabled furnace filters are a thing. The Filtrete Smart 1500 MPR, MERV 12 filter boasts an electrostatic media that catches particles as small as 0.3 microns, effectively removing dust, mold spores, pollen and smog. It lasts from six to 12 months, longer than many filters.

If you install the app on your iPhone or Android device, it will warn you when it needs changing. If you sign up with Dash Replenishment, it will even automatically order its replacement.