I opted for the MERV 8 filters, which are the "sweet spot" for most homes—they catch dust, lint, and pollen without overworking the AC motor. After a month of use, I pulled the first one out to check it, and the amount of gray dust it trapped was impressive (and slightly gross).
The best part of buying online is the "Subscribe & Save" or bulk discount. I bought a 6-pack, which brought the price down to about $8 per filter , compared to the $15+ I was paying for single filters at big-box retailers. Plus, I don't have to remember to go to the store; I just grab the next one from the garage every 90 days.
I was worried the filters would arrive crushed, but they came in a sturdy, flat-packed cardboard box. Shipping took about three days. The filters were pristine—no bent frames or torn pleats, which is crucial for a tight seal in the HVAC unit.
