Premium Allergen, Bacteria and Virus Filter, 18 x 24, 4/Carton | Bundle of 2

[This review was collected as part of a promotion.] I've been using Filtrete air filters in my A/C since my house was built. First I started with the red filters (1000), but upgraded to the purple (1500) ones and now the blue (1900) version. The 1500 and 1900 versions have much more filter surface area to catch particles than the 1000 version so I use only those now. But frankly, I can't say whether the blue 1900 version is any better than the purple 1500 filter. I think it's more important to make sure you don't let your filters go too long between changes. My neighbor only changes his when they start looking like a fur coat. That's way too long and will overtax your HVAC. He's already had to replace his central A/C after only twelve years. Tip: write the date you installed the new filter all along its frame. That way you can see the date just by looking up at the air return without having to get a ladder and opening it up.

Have used Filtrete MPR 1900 16x20x1 for 5 years and have never had an issue with fit or performance. During non-HVAC times of the year, I will run the air handler only for 30 minutes and it cleans the home air. And although the recommended filter replacement is every 3 months, I get 6 months of use so it's not high cost for what you get. It's also in a home location quick & easy for me to remove, inspect, and replace it.