Bushfire Smoke Is Back — Which Cooling Method Is Actually Safe to Run

The 2025-26 Australian bushfire season is already serious — parts of southeastern Australia have seen some of the most dangerous fire weather since the 2019-20 Black Summer fires, with real damage and loss of life in Victoria and New South Wales this year. Alongside the direct fire risk itself, bushfire smoke raises a real, specific question this site can actually help answer: which of the cooling methods we cover is safe to run when the air outside isn’t.

A safety note before the rest of this: this page is general information about which cooling appliance helps versus hurts during smoke — it isn’t medical advice, and it isn’t a substitute for official warnings. If a fire, health, or air quality authority tells you something different, including to evacuate, follow that over anything here. If anyone in your home is having trouble breathing or shows signs of smoke-related illness, seek medical help immediately.

The one thing worth knowing before anything else

Official Australian health guidance during a smoke event is consistent: close windows and doors, and if you have one, run a reverse-cycle air conditioner set to recirculate indoor air rather than draw in fresh air from outside. Research from the 2019-20 fires found indoor fine particulate levels up to ten times lower than outdoor levels in homes doing exactly this.

Evaporative coolers are the one method that works against this. Their entire mechanism depends on pulling outside air through water-soaked pads — during a smoke event, that draws smoke-affected air directly into the room you’re trying to protect. This isn’t about any specific brand or model; it’s true of every evaporative cooler, including good ones we’d otherwise recommend without hesitation for the right dry climate.

What to actually run, by what you already have

If you have a reverse-cycle split system, this is exactly the situation it’s built for — set it to recirculate rather than drawing in outside air, and it genuinely helps rather than just failing to make things worse.

If you only have a fan, it’s a reasonable fallback specifically because it moves air that’s already inside your sealed home rather than pulling anything in from outside. It won’t filter what’s already indoors, but it doesn’t actively worsen it either.

If you only have an evaporative cooler, the honest answer is to not run it on smoke-affected days specifically, even though it’s a perfectly good choice the rest of the time in a dry climate. Seal the house and wait it out, or use a plain fan instead for that specific day.

If you’re deciding what to buy and live somewhere smoke events are a real, recurring concern, that’s a genuine reason to weigh a reverse-cycle split system more heavily against an evaporative cooler than climate alone might suggest — see our climate-by-area breakdown for the normal-conditions case, and factor this in on top of it.

What’s genuinely outside our expertise

Real-time air quality monitoring, evacuation guidance, and general bushfire safety planning are genuinely outside what this site can responsibly advise on — your state’s environmental protection authority publishes live air quality data, and the Australian Centre for Disease Control publishes real bushfire smoke health guidance. We can tell you which appliance helps or hurts; we’re not the source for whether a fire is actually a threat to your area right now. See our disclaimer for how we think about the limits of what we can responsibly advise on.

If you haven’t already sorted your own setup for the season generally, our El Niño summer prep guide covers the broader picture, including why buying or servicing cooling gear now beats waiting for a heatwave to force the issue.