Preparing Your Home and Health for Extreme Heat: An Australian Guide
Every summer, somewhere in the world, a heat advisory pops up on a phone screen and people scramble to react. As I write this, weather services across California's Inland Empire and Central Valley are issuing back-to-back heat advisories for San Bernardino and Riverside Counties, while Modesto braces for a weekend temperature spike. Different hemisphere, same problem — and the same lessons apply here at home.
Australia is the developed world's hottest continent, and our heatwaves kill more people than bushfires, floods and cyclones combined. Yet most of us treat extreme heat as background noise until the power bill or the headache hits. This guide pulls together what those overseas advisories teach us, and turns them into a practical plan you can run through before the next 40-degree week rolls in.
Understanding what a heat warning actually means
The terminology around heat alerts can be confusing. As 12News explains, agencies typically use a tiered system: a heat advisory is the lower-level alert, while an extreme heat warning is reserved for more dangerous conditions where the combination of temperature and humidity poses a serious risk to health.
The Australian Bureau of Meteorology uses a similar three-tier system — low-intensity, severe and extreme heatwaves — calculated by comparing forecast temperatures to what's typical for that location at that time of year. That last point matters: a 36-degree day in Hobart is a far bigger deal than the same temperature in Marble Bar, because it's the unfamiliarity that catches bodies and infrastructure off guard.
The takeaway: don't just look at the number on the forecast. Pay attention to the alert level, how many days in a row the heat is expected, and overnight minimums. A run of warm nights — when your body can't recover — is what turns a hot week into a deadly one.
Make your home a heat shelter, not a heat trap
Australian housing stock is famously bad at handling heat. Dark roofs, west-facing glass, minimal eaves and patchy insulation mean many homes act like ovens by mid-afternoon. The good news is that most of the highest-impact fixes are cheap and don't require a tradie.
- Close the house up early. Open windows overnight to flush out heat, then by 8am close every window, pull every blind and draw curtains on the sun-facing side. External shade — awnings, shade sails, even a beach umbrella propped against a hot window — beats internal blinds every time, because it stops heat before it gets through the glass.
- Reflect the sun. A piece of cardboard wrapped in aluminium foil and wedged into a west-facing window can drop the room temperature by several degrees. It looks ugly. It works.
- Use fans the right way. A ceiling fan should run anti-clockwise in summer to push air down. Pedestal fans work best when paired with a damp tea towel or a bowl of ice in front of them. Once the air temperature climbs above about 35 degrees, however, fans alone stop being effective and may even speed up dehydration.
- Service your air-con before you need it. Clean filters can improve efficiency by up to 15 per cent, which matters when an extended heatwave doubles your power bill. If you don't have aircon, identify the coolest room in the house — usually south-facing, on the ground floor — and make that the day room.
- Plan for blackouts. Heat events strain the grid. Charge devices the night before, freeze water bottles for makeshift coolers, and know where your nearest air-conditioned public space is — a library, shopping centre, or community cooling centre.
Protecting your body when the temperature climbs
The health advice that accompanies every heat advisory — including those just issued for the Central Valley — sounds repetitive because it works: drink water, stay out of the sun, check on neighbours. The reason it gets ignored is that people underestimate how quickly heat illness escalates.
Heat exhaustion symptoms include heavy sweating, weakness, nausea, headache and a fast but weak pulse. The treatment is shade, cool water on the skin, and slow sips of fluid. If those symptoms tip over into confusion, hot dry skin (sweating stops), a rapid strong pulse or loss of consciousness, you're now dealing with heat stroke — a medical emergency. Call 000.
A few rules that apply to almost everyone:
- Drink before you're thirsty. By the time you feel thirst, you're already mildly dehydrated.
- Skip the big run, the garden weeding and the garage tidy-up. Reschedule any heavy physical activity to before 9am or after 7pm.
- Watch the alcohol and caffeine — both pull water out of you.
- Wear loose, light-coloured, natural-fibre clothing. A wet bandana around the neck or wrists cools the blood passing through.
- Never leave children, older people or pets in a parked car. The interior can climb 20-30 degrees above ambient in under ten minutes.
The people who need extra eyes on them
Heat doesn't kill evenly. The same advisories warning Modesto residents to take precautions stress that risk is concentrated among a few groups: people over 75, infants and young children, pregnant women, those with chronic conditions like heart disease, diabetes or kidney disease, and anyone on medications that affect hydration or temperature regulation (including some blood pressure drugs, antidepressants and antihistamines).
If you have an elderly neighbour or relative living alone, build a simple check-in routine for forecast hot days: a phone call mid-morning and again late afternoon. Don't assume their air-conditioner is on — many older Australians ration cooling out of cost anxiety, sometimes fatally. If you can, agree on a code phrase that means "I'm not okay" so they don't have to admit they're struggling.
Pets need the same vigilance. Walk dogs at dawn or dusk, test the footpath with the back of your hand (if you can't hold it there for seven seconds, it's too hot for paws), and provide multiple shaded water sources. Birds in cages on verandahs cook quickly — bring them inside.
Building a longer-term heat plan
One-off scrambles before a heatwave are exhausting. The households that cope best treat heat resilience as an ongoing project. Over a few years, that might mean planting deciduous trees on the western side of the block (shade in summer, sun in winter), upgrading ceiling insulation to at least R5, installing external blinds or shutters, painting the roof a lighter colour at the next repaint, and switching to a high-efficiency reverse-cycle aircon zoned to the rooms you actually use.
It's also worth signing up to your state's emergency alert service and bookmarking the BOM heatwave forecast. Knowing a heatwave is three days away — not three hours — is the difference between a calm preparation and a panic.
Heat is the most predictable natural hazard we face. Unlike a bushfire ember or a flash flood, it announces itself days in advance. The work, then, is in not being surprised — in turning each forecast advisory into a checklist you've already run through, so that when the mercury climbs, your home and the people inside it are ready.