How Much Are Air Conditioner Filters? Price Guide

Most air conditioner filters cost between about $5 and $25 each, with price driven mainly by the type. Basic fiberglass filters are the cheapest at roughly $1 to $5, standard pleated filters run about $5 to $25 depending on size and MERV rating, and reusable washable filters cost more upfront (around $15 to $50, sometimes higher) but pay back over years of reuse. Since most central systems need a fresh filter every 1 to 3 months, it helps to budget for several a year. Below is a clear breakdown of what each type costs, what drives the price up or down, and how to pick the right air conditioner filter for your system and budget.

How often you replace a filter depends on the system and the filter type, and that frequency matters as much as the sticker price. A $2 fiberglass filter you change monthly and a $20 pleated filter you change quarterly can cost about the same over a year, so think in terms of annual cost, not just the price of a single filter. Always follow your manufacturer’s guidelines for the right size and replacement schedule.

Air Conditioner Filter Prices by Type

There are several types of air conditioner filters, and the type is the biggest factor in price. The three you’ll see most often:

1. Fiberglass filters (about $1–$5): The most basic and economical option, made of spun glass fibers. They trap large particles like lint and dust but do little for smaller allergens, and they need frequent replacement (often monthly).
2. Pleated filters (about $5–$25): Folded paper or synthetic media that captures a wider range of particles, including finer dust and many allergens. They cost more than fiberglass but filter better and typically last 1 to 3 months. Higher-MERV and larger 4- to 5-inch versions sit at the top of this range or above.
3. Washable (reusable) filters (about $15–$50+): Made to be rinsed and reused for years, so the per-use cost drops over time. The trade-off is they often capture fewer fine particles than a good pleated filter and must be cleaned and fully dried on schedule.

The right pick comes down to the filtration level you need and how often you’re willing to replace or clean it. Prices shift with size, brand, and MERV rating, so two pleated filters can vary widely.

What Affects Air Conditioner Filter Prices

1. Filter type and MERV rating: Higher-efficiency media (higher MERV) costs more because it captures finer particles. This is usually the biggest price driver.
2. Size and system type: Central systems use larger filters than window or portable units, and odd or oversized dimensions cost more. A 4- to 5-inch media filter costs more than a 1-inch.
3. Material: Fiberglass is cheapest; pleated synthetic and electrostatic/washable materials cost more.
4. Brand and quality: Name brands and higher-quality builds cost more but can filter better and, in the case of washables, last for years.
5. Where you buy: Home-improvement stores, big-box retailers, and online sellers price the same filter differently, and multi-packs almost always lower the per-filter cost. Shop around.

Average Prices at a Glance

• Fiberglass filters: roughly $1 to $5 per filter, cheaper in multi-packs.
• Pleated filters: roughly $5 to $25 per filter, depending on size and MERV rating.
• Washable filters: roughly $15 to $50+ upfront, but reusable for years.

To estimate your true annual cost, multiply the price of one filter by how many you’ll go through in a year. A cheap filter changed often can cost as much as a pricier one changed less.

Where to Buy and How to Save

Once you know your exact size and the type you want, where and how you buy makes a real difference to the price per filter. A few ways to spend less without cutting corners:

• Buy in multi-packs. A 4- or 6-pack almost always drops the per-filter cost well below the single-filter price at the hardware store.
• Compare online vs. in-store. Big-box and online sellers often price the identical filter differently. Subscription delivery can add a small discount and keep you on schedule.
• Don’t overpay for MERV you can’t use. A very high-MERV filter costs more and can restrict airflow on systems not built for it, so match the rating to your equipment rather than buying the priciest option.
• Consider a washable filter for the long haul. The higher upfront price can pay off over several years if you’re diligent about cleaning and drying it.

Whatever you buy, the cheapest filter is the one that actually protects your system. A clogged or poorly fitted filter forces the unit to work harder and can lead to repair bills that dwarf any savings on the filter itself.

How to Choose the Right Air Conditioner Filter

1. Get the size exactly right. Read the dimensions printed on your current filter (or the slot) and match them. A filter that’s too small or too large lets air bypass it and won’t protect your system.
2. Weigh budget against replacement frequency. Decide how much you’ll spend per year, not per filter, and factor in how often each type needs changing or cleaning.
3. Match the MERV to your needs. Allergy sufferers benefit from higher-MERV pleated filters, but very high MERV can restrict airflow on some systems, so check what your equipment is rated for.

Replacing Your Air Filter – Which One to Choose?

Next Steps

Air conditioner filters are inexpensive but essential. Expect to pay about $1 to $5 for fiberglass, $5 to $25 for pleated, and $15 to $50 or more for a reusable washable filter, with size, MERV rating, brand, and where you buy moving the number around. Get the size exactly right, match the MERV to your needs and your equipment, and think about annual cost rather than the price of one filter.

Then buy in multi-packs to save, set a reminder to check the filter monthly, and replace it on schedule. A clean filter keeps your system efficient and helps you avoid the bigger repair bills a clogged one can cause.