Updated September 2026.
By the time somebody's standing in front of the purifiers, they've usually stopped asking whether the thing works. The question we get across the counter is the one nobody prints on the box: what does this cost me every month after I've paid for it? So we sat down with the manufacturers' own wattage figures, the published Delhi tariff and the price of the filters these machines actually take, and worked the air purifier running cost out properly.
Most people brace for the wrong half of the bill. They stand there doing sums about electricity, and electricity turns out to be the cheap part. What they're really asking, underneath the question about running cost, is whether this thing is going to keep taking money off them for years. It is, but not in the way they're expecting, and the amount is decided the day they pick the machine rather than later.
How much does it cost to run an air purifier in Delhi?
Somewhere between about Rs 2,500 and Rs 16,000 a year per machine, and only Rs 350 to Rs 800 of that is electricity. The rest is filters. That ratio surprises nearly everyone, because electricity is the cost people think about while they're deciding and filters are the cost they meet the following winter.
That range is wide because it isn't really one number. Air purifier running cost is really two numbers stacked on top of each other, and the second one does the damage. A mainstream machine with a sensibly priced cartridge lands near the bottom of the range. A premium machine whose replacement filter costs as much as a small purifier lands at the top. Which end you live at is decided on the day you choose the machine, not later.
Two assumptions sit under every figure below, and we'd rather state them than bury them. Delhi's bad stretch runs from roughly the last week of October to the end of January, so call it four months. And we've costed twelve hours a day through those four months, which is about 1,440 running hours a season. If yours runs overnight only, halve everything. If it runs around the clock, double it.
We'd rather over explain this than have somebody come back in March feeling they were sold a number. Nobody's air purifier runs on a spreadsheet's schedule.
How much electricity does an air purifier actually use?
Between about 36 and 82 watts at full tilt, which is Rs 340 to Rs 770 for a whole Delhi season. A ceiling fan sits in the same territory. Here are three machines we stock, using the power figure each manufacturer publishes rather than anything we've estimated.
| Model | CADR | Rated power | Clean air per watt | Units a season | Electricity a season |
|---|---|---|---|---|---|
| Philips AC3220/60 | 520 m³/h | 36 W | 14.4 m³/h | 52 | about Rs 340 |
| Honeywell Air Touch V4 | 350 m³/h | 40 W | 8.8 m³/h | 58 | about Rs 375 |
| Honeywell Air Touch P1 | 450 m³/h | 82 W | 5.5 m³/h | 118 | about Rs 770 |
Power and CADR as published by Honeywell and Philips. Costed at Rs 6.50 a unit, the 401 to 800 unit domestic slab in the Delhi domestic tariff schedule published by BSES, which runs Rs 3.00 a unit for the first 200, Rs 4.50 to 400, Rs 6.50 to 800, Rs 7.00 to 1,200 and Rs 8.00 above that. Your bill also carries a power purchase surcharge on top of the slab rate, so work from the slab you're actually in.
One wrinkle worth knowing if you're close to a slab boundary. Delhi's domestic tariff is banded, so the units a purifier adds are charged at whatever band you finish the month in, not at the cheap first-200 rate. A single machine adds roughly 13 to 30 units a month over the bad season. If that tips you from one band into the next, the extra units cost more than the table above suggests, and so does everything else you ran that month.
Those are maximum-power numbers. On auto mode a purifier sits well below its rated draw most of the time and only winds up when the room needs it, so read the season figures as a ceiling rather than a forecast.
Honestly, the electricity is the part we spend the least time on at the counter, and we only work it out at all because customers ask. Once somebody sees that a whole winter of running costs less than a tank of petrol, they stop worrying about it and start asking the right question instead.
Why do two air purifiers with the same CADR cost different amounts to run?
Because clean air per watt varies by nearly a factor of three between machines sitting on the same shelf. Nobody advertises this number, and it's the one that decides the electricity half of your bill.
Divide CADR by rated watts and you get how much clean air each watt buys you. The Philips above delivers 14.4 cubic metres an hour for every watt it draws. The Honeywell P1 delivers 5.5. Both are serious machines from serious brands, and one of them turns electricity into clean air nearly three times as efficiently as the other.
Before you pick on watts alone, though: sizing matters more. A machine too small for the room runs flat out all evening and never gets ahead, which costs you more than an inefficient motor ever will. We've done that arithmetic room by room in our guide to the best air purifiers for Delhi pollution, and it's worth reading first.
What does a replacement air purifier filter cost?
Anywhere from a little over Rs 2,000 to around Rs 15,500 for one replacement, depending entirely on which machine you bought. That spread is the whole story of air purifier running cost, and it's fixed at the moment of purchase.
Some real examples off our own shelves, as bands rather than tags, because filter prices move. The complete three-in-one cartridge for a Honeywell Air Touch P1 sits a little over Rs 3,000. A Philips FY3433 HEPA filter plus its matching carbon filter comes to the mid Rs 5,000s for the pair. A Blueair 400 Series SmokeStop filter is around Rs 11,000 on its own, and the 500 and 600 series equivalent is into the mid Rs 15,000s.
This is the bit we wish people would ask about in the shop, and almost nobody does. Put the filter spend next to Rs 340 to Rs 770 of electricity and you can see where the money goes. On our best fully costed example, the Air Touch P1, a season of electricity is about Rs 770 and its cartridge is a little over Rs 3,000. Filters are four times the electricity, on a machine that isn't even an expensive one to feed. We've had customers walk back in a year later shocked, not because anyone misled them, but because nobody thought to mention it while they were choosing.
There's a trap in here worth knowing about. On some machines one part does everything, and on others the particle filter and the gas filter are separate purchases. The cold catalyst and carbon filter for the Air Touch V4 is under Rs 2,500, which looks like a bargain until you notice it handles formaldehyde, odours and VOCs and does not replace the HEPA layer that catches PM2.5. Two parts, two prices, one machine.
So do one thing before you buy any HEPA air purifier: ask what its replacement filter costs, ask whether that's the whole filter or half of it, and write the part number down. The Philips AC3220/60 takes an FY3200/30, for instance. Any retailer worth dealing with will tell you without being pushed.
How long does an air purifier filter last in Delhi?
Read the rating as hours or one year, whichever arrives first, and expect Delhi air to reach the hours faster than the rating assumes. Honeywell rates the Air Touch cartridges at up to 9,000 hours or one year. Philips recommends a yearly change on the AC3220/60. That "or one year" is doing quiet work, and most people skip straight past it.
Here's why it's there. Hours ratings are worked out in ordinary air. Filters load with the dust that's actually in the room, and as they load, pressure across the media climbs, airflow drops and the fan works harder for less clean air. That's the mechanism behind a purifier that seems fine in November and feels useless by January. The US EPA's Guide to Air Cleaners in the Home puts it plainly: replace filters according to the manufacturer's recommendation, and many factors change how quickly a filter gets dirty.
Shark's approach is worth a look if this part bothers you. Its NeverChange range is rated for five years on one filter, and the rating is honest about its own terms: it's tested to the GB/T18801-2022 standard, measured to the point where clean air delivery has dropped by half, at twelve hours a day on maximum. That's a real number with a real endpoint attached, which is more than most filter-life claims come with.
If you want something to plan against rather than guess at, count hours instead of months. Most machines with a filter-change alert are counting running hours internally, so that light is the machine telling you it's spent its budget. On one without an alert, stick a bit of tape on the back with the date you fitted the filter and a rough daily run time. Four months at twelve hours a day is 1,440 hours. Doing that turns air purifier running cost from a nasty surprise into a line you can budget for.
One more thing we've learned from the people who come back happy. The ones who keep their air purifier running cost at the bottom of that range aren't the ones who bought the cheapest machine. They're the ones who bought a machine whose filter they were willing to pay for, and then actually changed it when the light came on. A purifier running on a filter that's twelve months past its date is an expensive fan. We see it every year, usually in the same conversation where somebody tells us the machine has stopped working.
The cheapest habit in this whole article is rinsing the pre-filter. It's the washable mesh at the front, it takes five minutes under a tap, and doing it monthly through the season is what stops road dust reaching the HEPA layer you paid four figures for. Skip it and you turn a two-season filter into a one-season filter, which doubles your filter spend without changing a rupee on your electricity bill. When somebody tells us their purifier has stopped working properly, this is the first thing we ask about, and most of the time it's the answer.
Is it cheaper to run an air purifier only when the air is bad?
Not really, because the saving is a few hundred rupees a year and the loss is most of what you bought the machine for. Switching off is a false economy once you've seen what the electricity actually costs.
A single-blinded randomised crossover study published in Aerosol and Air Quality Research ran portable HEPA purifiers against sham units with the filter taken out, across 29 homes. In the room holding the machine, PM2.5 came down by 78.8%, a median of 1.59 against 5.55 micrograms per cubic metre with the filter removed. In a second room elsewhere in the home it still came down by 57.9%.
One honest caveat. Those homes started far cleaner than a Delhi bedroom in December does, so the percentage should carry across but the number you finish at won't look anything like 1.59. It's still the difference between bad air and much less bad air, for the price of a couple of restaurant meals spread across a whole winter.
Which air purifier is cheapest to own?
The one whose filter you can afford to replace on schedule. We've ordered these by air purifier running cost rather than by sticker price, which gives a different list from the one most guides hand you.
Philips AC3220/60, under Rs 20,000
If you're going to leave one machine running all winter in a big room, this is the one we point at. The efficiency winner by a distance: 520 m³/h of clean air on 36 watts maximum, which is the lowest electricity bill here by some way, plus a two year warranty. Filter is the FY3200/30 on a yearly interval. If you're buying one machine for a large living room and you plan to leave it on, this is the one whose electricity you'll never notice.
Honeywell Air Touch P1, mid Rs teens
The one we suggest for people who know they'll forget. 450 m³/h through H13 HEPA and carbon, rated to 698 sq ft, 30 dB at low speed. The highest electricity draw in this list at 82 watts and still under Rs 800 for a season. What earns it the place is the other half: one sealed three-in-one cartridge, a little over Rs 3,000, rated to 9,000 hours or a year. Nothing to work out and nothing to forget.
Honeywell Air Touch V4, low Rs teens
Good machine, one thing to watch, and we'd rather say it than let you find out. 350 m³/h on 40 watts across 543 sq ft, down to 34.4 dB, with a UV LED and ionizer on top of the H13 HEPA. Better clean air per watt than the P1 and cheaper to buy. Just go in knowing the carbon and the HEPA are separate parts here, so price both before you compare it with a single-cartridge machine.
Honeywell Air Touch V3, under Rs 10,000
The one we hand over most often for a bedroom. 300 m³/h for up to 465 sq ft at 65 watts, 30 dB at low speed, same 9,000 hour or one year filter interval as the rest of the range. It's the cheapest way into H13 HEPA that we'd still recommend without qualifying it, and that last part matters. There are cheaper purifiers on the market and we don't sell most of them.
Shark HP072EU NeverChange, under Rs 20,000
This is the one we get most curious questions about. It changes the arithmetic instead of shaving it. Five years on one filter means the filter line of your budget is zero until the machine is nearly out of warranty. It's a compact unit, so treat it as a bedroom or study machine rather than a living room one, and read the five year rating for what it is: measured to the point where clean air delivery has halved, not to the point where it stops.
What quietly doubles your air purifier running cost?
Five habits, and the pre-filter you never rinse is the worst of them. Every one of these costs more than anything that will ever show up on your electricity bill.
- Never rinsing the pre-filter. Delhi dust loads it in weeks. A monthly rinse is the cheapest thing you can do, and skipping it is the most expensive.
- Buying the machine without asking the filter price. Two purifiers a thousand rupees apart on the shelf can be twelve thousand apart every year afterwards.
- Assuming one filter is the whole filter. On plenty of machines the HEPA and the carbon are separate parts with separate prices. Ask which you're being quoted.
- Running a machine that's too small on top speed all evening. An undersized purifier never catches up, so it draws full wattage for hours instead of easing off on auto.
- Leaving a window open while it runs. The filter loads at the rate the air is dirty, and an open window on a bad day is the fastest way to spend one.
Where can I buy an air purifier online in Delhi NCR?
From our online store or our showroom, and either way ask for the filter price before you pay for the machine.
You can buy an air purifier online from us with delivery across Delhi NCR, or bring your room's dimensions into the showroom and we'll work the sizing and the yearly cost out with you before you commit to anything. We've been an appliance retailer in this city long enough to have sold plenty of people their second set of filters, which is where you find out whether the machine was the right call in the first place. Ask us what a replacement filter costs. If we're recommending something with an expensive one, you deserve to hear that while you're still deciding.