Clear the air with these fantastic 20 x 25 x 4 inch furnace filters

While it may not be the most exciting topic in the world, Furnace filters are a necessary part of modern life. If you want your air conditioners and furnaces to work correctly, you need to have a good set of filters in place. The right filters can also help reduce reactions to allergens and generally keep your air quality much better. There are a lot of different sizes of filters out there, so we have put together our favorite 20 x 25 x 4-inch filters just for you.

A years supply

FilterBuy Pleated AC Furnace Air Filter (4-pack)

Staff Pick

Almost any AC technician you talk to will tell you that you should change your filters every 90 days or so. So it stands to reason that having four stored somewhere in your house will keep you filtered for the entire year. These filters are slightly lower on the MERV scale, but they are great for the price and will filter out most larger particles from your furnace system.

$62 at Amazon

Ultra filtration

Green Label MERV 16 filters (2-pack)

MERV 16 is the highest filtration you can get without moving into industrial-strength hospital filtration systems. It can filter out particles as small as 0.3 microns, including mold spores, bacteria, and even nicotine smoke, making the most comprehensive filters you can buy at this size.

$92 at Amazon

Shockingly good

Filtrete Deep Pleat electrostatic (2-Pack)

These filters are electrostatically charged to help trap pollen and other particulates with high efficiency. With a MERV 11 rating, these filters can catch mold spores but aren’t quite good enough to filter out bacteria. These 4-inch filters can last up to a year, though, so they can save you a good chunk of change.

$40 at Amazon

Balanced value and quality

Bestair Merv 13 (3-Pack)

MERV 13 is a fantastic rating for any residential filter. It will keep your air clear from most contaminants, and this three-pack is enough filters to keep you breathing free for months. While the price could be considered high, the high MERV rating makes them an excellent value.

$95 at Amazon

Who is this MERV person?

The Minimum Efficiency Reporting Value, or MERV, is the value assigned to filters that lets you know how good they are at filtering out particulates in the air. The higher the MERV number, the more things they can filter out. For example, a MERV rating of 8 will filter out pollen, dust mites, and mold, but a higher grade like 13 will also filter out nicotine smoke, and even bacteria and the cause of Legionella.

Of course, the higher the MERV rating, the more the filter will cost you, so it is crucial to find the right balance. If you don’t have pets, for example, then a relatively low MERV — between eight and 12 — should be enough to keep your air relatively pure. If you have pets or small humans — or you live in a particularly dusty place — then a higher MERV may be worth the extra cost so you can breathe easier.

My favorite

I’ve recently bought myself the Green Label MERV 16 filters as they have the best filtration I have seen for residential housing. My dog is a shedder, and I live out in the desert, so air quality is always poor. These filters should help me keep my house’s air quality much higher than ever before.

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