What Does an Air Purifier Cost to Run? (2026 Breakdown)

Quick answer: Electricity is the smaller part of the bill. A typical HEPA air purifier running 24/7 uses about $20 to $75 a year in electricity at the US average rate, while replacement filters cost about $45 to $150 a year. Over five years, filters often cost more than the purifier did. Filterless probiotic systems swap filters for refill cartridges: the BioLogic Mini Gen 2 is the cheapest option over five years in our comparison, and the Biotica 800 costs more each year to run than a budget HEPA unit.

The three costs, and why most buyers budget for one

Almost everyone budgets for the purchase price. Few people budget for the other two.

Upfront cost: the unit itself, plus installation for anything connected to your HVAC system.
Consumables: filters or refill cartridges. This recurring cost usually decides the five-year total.
Electricity: real, but usually the smallest line.

The cheapest unit on the shelf is often not the cheapest to own. A $150 purifier with $130 a year in filters costs more over five years than a $300 purifier with $60 filters. Do the math before you buy, not at the first filter change. For how the technologies differ in what they treat, see probiotic vs HEPA. This guide sticks to money.

Electricity

Use this formula with your own numbers:

(Watts ÷ 1,000) × hours per day × 365 × your electricity rate per kWh = yearly cost

The examples below use 17¢ per kWh, close to the US average residential price of 17.3¢ in 2025 reported by the US Energy Information Administration, which expects about 18.2¢ in 2026 (EIA). Your bill shows your own rate; rates in some states are much higher or lower.

Unit type	Typical draw	8 hours a day	24 hours a day
Small bedroom HEPA unit	15–30 W	about $7–$15 a year	about $22–$45 a year
Mid-size room HEPA unit	30–50 W	about $15–$25 a year	about $45–$75 a year
Large-room unit on high speed	50–100 W	about $25–$50 a year	about $75–$150 a year

Worked example: a 30 W purifier running all day uses 0.03 kW × 24 hours × 365 days = 263 kWh a year. At 17¢, that is about $45 a year, or under $4 a month.

Two practical points:

Fan speed matters most. High speed can use two to three times the power of low. A unit rated for a bigger room, running on low or medium, often uses less power than a small unit running flat out.
Purifiers are modest users of power. A 30 to 50 W purifier draws about as much as three to six 9-watt LED bulbs. For most households, running one around the clock is affordable.

To check any device's real draw, plug it into a plug-in watt meter (about $15 to $25 at hardware stores) for a day. That beats any spec sheet, including ours.

Filters: the cost that decides the total

Most HEPA purifiers use two or three filter stages: a pre-filter for hair and large dust, a true HEPA filter for fine particles, and often an activated carbon filter for odors and some gases. Each stage has its own lifespan and price.

Filter type	Typical replacement interval	Typical cost
Pre-filter	Every 2–4 weeks (vacuum or rinse; often washable)	$0–$20
True HEPA filter	6–12 months	$30–$100
Activated carbon filter	3–6 months	$20–$60
Combined HEPA and carbon cartridge	6–12 months	$30–$150

Two real examples, with prices from each maker's own store as of November 2026:

Levoit Core 300: the original replacement filter costs $29.99, and Levoit recommends replacing it every 6 to 8 months (Levoit). That works out to about $45 to $60 a year.
Coway Airmega AP-1512HH: the filter set costs $59.79 and includes one HEPA filter, replaced yearly, and two carbon filters, each replaced every six months (Coway). That is about $60 a year.

Both are well-reviewed purifiers with reasonable filter costs. Larger and premium models often cost $100 to $150 a year in filters.

Three things catch buyers out:

Intervals assume average use. Maker intervals assume moderate use in typical conditions. Homes with pets, smokers, heavy dust, or wildfire smoke nearby go through filters faster, sometimes twice as fast.

Some filters are proprietary. Many brands sell cartridges only they make, at prices they set, and off-brand filters may affect your warranty. Before you buy a purifier, look up its replacement filter's price and availability. You'll pay it for as long as you own the machine.

Skipping replacements doesn't save money. A clogged filter catches less, restricts airflow, and makes the fan work harder. In humid conditions it becomes a damp, dirty surface sitting in the airflow. A purifier with a spent filter mostly moves air around.

Worked example: a unit that needs a $70 HEPA filter once a year plus two $40 carbon filters a year costs $150 a year in consumables. Over five years, that's $750, more than most purifiers cost to buy. Our comparison of how we stack up compared with Blueair runs the same math for a premium filter brand.

Comparing on more than cost? See probiotic vs HEPA

What filterless probiotic systems cost

Environmental probiotic systems have no filters, so that line disappears. They are not free to run. They use a probiotic formula in refill cartridges that you replace on a schedule.

System	Price	Coverage	Refill	Refill life	Refill cost per year (4 refills)
BioLogic Mini Gen 2	$98	Up to 300 sq ft	$19 (twin pack $38)	Up to 90 days	about $76
Biotica 800	$299, first cartridge included	Up to 800 sq ft	$45 cartridge (twin pack $90)	Up to 90 days	about $180
E-Biotic Pro (HVAC)	Priced by quote through installers	Up to 25,000 sq ft	Set by installer	Ask your installer	Ask your installer

"Up to 90 days" is the maximum. If you replace refills sooner, your yearly cost goes up, so budget for at least four a year.

What changes with a filterless design:

No filters to buy or change. The refill is the only consumable.
No filter loading. There is no filter to clog between changes.
Refills are still a recurring cost and a recurring piece of plastic. Cartridges are consumables you replace about every 90 days, so treat them with the same scrutiny you'd give a filter.

We haven't listed electricity for the probiotic units because a verified wattage figure isn't published yet. A plug-in watt meter will show you the real figure in a day.

The upfront reality

Upfront, the room units sit in the same range as mainstream HEPA purifiers. The BioLogic Mini Gen 2 costs $98 and the Biotica 800 costs $299. A capable mainstream HEPA purifier costs about $100 to $400. The whole-home E-Biotic Pro is installed through certified HVAC contractors and priced by quote, so get a written quote that spells out installation and ongoing refill costs.

Three things are true at once:

The recurring costs differ. The Biotica 800 costs about $180 a year in cartridges, more than a budget HEPA purifier's $45 to $60 a year in filters. The BioLogic Mini Gen 2 costs about $76 a year, which makes it the cheapest unit to own over five years in the comparison below.
Sizing changes the math. One Biotica 800 covers up to 800 sq ft, while many budget HEPA units are sized for smaller rooms. For several closed rooms, compare the full cost of each setup. We work through that decision in room unit vs whole-home.
They do different jobs, and this matters most. A HEPA filter removes particles from the air. A probiotic system treats surfaces, where beneficial bacteria settle and consume the organic residue that odor-causing bacteria and mold feed on. If you want pollen or smoke pulled out of the air, a HEPA purifier does that and a probiotic system does not, so the probiotic unit is the wrong buy at any price. If your concern is what builds up on surfaces, filters don't reach it. Some households want both and should budget for both.

So, plainly: a probiotic unit is the right purchase only if surfaces are the problem you're solving. If they are, the Mini is the lowest-cost way to start in one room, and the Biotica 800 costs more to run but covers a much larger space.

Five-year totals

Estimates for one room, running continuously, at 17¢ per kWh. Swap in your own rate and check current prices.

	Budget HEPA	Premium HEPA	BioLogic Mini Gen 2	Biotica 800
Covers	Small to mid room	Mid to large room	Up to 300 sq ft	Up to 800 sq ft
Upfront	about $150	about $400	$98	$299
Filters or refills, 5 years	about $300	about $600	about $380	about $900
Electricity, 5 years	about $225 (30 W)	about $375 (50 W)	Not included	Not included
5-year total	about $675	about $1,375	about $478 plus power	about $1,199 plus power

Figures as of November 2026. Filter and refill prices change; check current prices before relying on these numbers.

What the table shows: the Mini is the cheapest over five years, a budget HEPA unit comes next, and the Biotica 800 lands between a budget and a premium HEPA unit. Remember that these products treat different things, so the cheapest line is only useful if it solves your problem.

Costs people forget

Shipping and subscription minimums on filters and refills.
More than one unit. Purifiers work room by room, and costs multiply fast in a home with several closed rooms.
Installation for HVAC-connected systems, plus any contractor visits.
Noise. A unit too loud to sleep with gets turned off, and a purifier that is off does nothing. Check noise on the setting you'll use at night.
Warranty length. A long warranty that the maker honors lowers the real cost of ownership.
Your time for ordering, changing, and remembering filters or refills. Subscriptions help.

The bottom line

Electricity is rarely the issue: most air purifiers cost about $20 to $75 a year to run around the clock. Filters are the bigger expense, often more than the purifier's price within five years, so look up the replacement filter before you buy. Filterless probiotic systems trade filters for refill cartridges. The BioLogic Mini Gen 2 is the cheapest option in our five-year comparison, while the Biotica 800 costs more each year than a budget HEPA purifier and covers a larger area. Whatever you compare, use the five-year total with your own electricity rate, and make sure the product treats the problem you have.

Frequently asked questions

How much does it cost to run an air purifier? Most air purifiers cost about $20 to $75 a year in electricity when run all day, depending on wattage and fan speed. To calculate yours, divide the unit's watts by 1,000, multiply by hours used per day, then by 365, then by your rate per kWh. Replacement filters usually cost more than the electricity, at about $45 to $150 a year.

Do air purifiers use a lot of electricity? No. A typical mid-size unit draws 30 to 50 watts, about the same as three to six 9-watt LED bulbs, so running it around the clock adds roughly $4 to $6 a month at average US rates. Fan speed makes the biggest difference. A larger unit on a low or medium setting often uses less power than a small one running at maximum.

How much do air purifier filters cost per year? Usually $45 to $150 a year, depending on the model and how many filter stages it uses. A true HEPA filter costs about $30 to $100 and lasts 6 to 12 months, carbon filters cost $20 to $60 every 3 to 6 months, and pre-filters are cheap or washable. Homes with pets, smoke, or heavy dust go through filters faster.

Are air purifiers expensive to maintain? Filters are most of the maintenance cost, and over five years they often add up to more than the purifier cost. Before you buy, look up the replacement filter's price and whether the brand uses proprietary cartridges, since you'll pay it for as long as you own the unit. Filterless probiotic systems have their own consumable, refill cartridges, which you should price the same way.

What is the cheapest type of air purifier to run? On electricity, a low-wattage unit on a low setting is cheapest. On total cost, compare the purchase price plus five years of filters or refills plus power. In our comparison, the BioLogic Mini Gen 2 had the lowest five-year total, followed by a budget HEPA purifier, but they treat different things, so choose the one that fits your problem first.

Do probiotic air purifiers need filters? No. Probiotic systems release beneficial bacteria that settle on surfaces instead of pulling air through a filter, so there are no filters to buy or change. They use refill cartridges instead: $19 for the BioLogic Mini Gen 2 and $45 for the Biotica 800, each lasting up to 90 days. It is a different recurring cost, not an absent one.

Is it cheaper to run one big air purifier or several small ones? For one large open space, a single properly sized unit on a lower speed is usually cheaper and quieter than several small ones. For separate closed rooms, air doesn't mix well between them, so you usually need one unit per room. Once you're pricing several units, compare the total against a whole-home system that runs through your HVAC.

What Does an Air Purifier Really Cost to Run? Filters, Refills & Energy