As Australia gears up for another summer that’s set to sizzle, experts say there are surprisingly simple, science-backed tricks that can help keep your home cooler — without cranking the air-con, blowing the budget or living in semi-darkness.From leafy houseplants to clever design tweaks, these heat-beating hacks can cut costs, ease heat stress, and make the hottest days feel a little less … dramatic.While the usual sun-safe advice still applies outdoors, staying cool inside often calls for a different toolkit.

So SBS News asked experts to uncover practical, unexpected ways to stay cool. And one of the easiest, most effective helpers might already be quietly photosynthesising in your living room: plants.

How plants can help you beat the heat

Alongside purifying the air, improving humidity and helping you breathe easier, indoor plants can also drop the temperature around them.

Gregory Moore, a botanist and tree expert, said grouping indoor plants can lower a room’s temperature through a process called transpiration. Source: Getty, iStockphoto / dolgachov

Gregory Moore, a senior research associate at the University of Melbourne’s School of Agriculture, explained the natural process behind this cooling effect. According to him, the magic is in transpiration — a kind of plant-powered evaporative cooling.”It’s the evaporation of water from the leaves of plants. It cools the air around the leaves, and so a large plant with many large leaves can have a significant effect,” he told SBS News.”It is possible to get cooling by one degree, and in some instances a little more if a room is small and conditions for the plants are close to ideal.”Think of it as the plant version of sweating, but without the gym towel.”But we only perspire when we are hot, while plants will transpire as long as there is water available in the soil. They do it all the time during the day,” Moore said.To keep the cooling process humming along, Moore said the soil needs to stay moist, not drenched. Too much water and your plant could end up with fungal problems.

“An early morning watering is probably most effective,” he said.

Moore said all indoor plants will transpire, but the larger they are and the bigger their leaves, the more cooling they will provide.”Many indoor plants such as monsteras, philodendrons, rubber plants and even some indoor palms will do well,” he said.

So before you crank the air-con, consider calling in a few leafy reinforcements. Turns out, the coolest room in the house might just be the one with the most plants.

Smart, low-cost cooling hacks

Beating the heat doesn’t have to mean blasting your air conditioner or spending a fortune. The key is to get ahead of the sun and stop heat from sneaking into your home ahead of a hot day.

According to the government’s guide to environmentally sustainable homes, up to 87 per cent of a house’s heat comes through windows — so blocking the sun early is half the battle.

Shamila Haddad is an architectural scientist specialising in indoor air and environmental quality at the University of Sydney.She said there are plenty of simple, low-cost strategies that can make a big difference.”Building-oriented measures include closing blinds or curtains during daylight hours, installing external shading and light-coloured blinds to block direct sunlight, window film, and increasing airflow with fans, ceiling fans and cross ventilation,” she told SBS News.”Opening windows at night and closing them in the morning helps remove trapped heat. Limiting the use of heat-generating appliances, such as ovens, stovetops, halogen lights, and electronics, helps maintain lower indoor temperatures.”Haddad notes that as climate change brings more frequent and severe heatwaves, effective cooling strategies will only become more important.

She highlighted passive design, cool materials, enhanced ventilation, glazing, insulation, and smart technologies as ways to reduce reliance on energy-intensive cooling — keeping homes comfortable and energy bills lower.

Sleeping through the heat: How to stay cool at night

Tossing, turning, and kicking off the covers on a hot night can make it hard to get a good sleep. But there’s no need to sweat it — science and clever sleep hacks from around the world show there are plenty of ways to stay cool through the night.

A study by the University of Sydney found fans can be effective at keeping people comfortable even when temperatures soar to 40 degrees. Source: Getty / ridvan_celik

Fans and fresh air

Opening a window at night can let cooler air circulate through your home, and fans amplify that effect. A study by the University of Sydney found fans can be surprisingly effective at keeping people comfortable even when temperatures soar to 40 degrees.

Professor Ollie Jay, lead researcher, stated: “Heatwaves claim lives every year, so it’s essential that people who can’t afford air-conditioning know that a fan is a good alternative and could even save lives.”

Warm showers for cool sleep

It might sound counterintuitive, but a warm bath or shower before bed can actually help lower your body temperature. By stimulating blood flow to the hands and feet, your body releases heat more efficiently, helping you drift off without overheating.

Doona diplomacy

Scandinavians have long been ahead of the curve when it comes to summer sleep hacks. Their trick? Separate doonas. This approach, common in Sweden, Norway, and Denmark, is gaining fans worldwide.

Using a personal doona allows each sleeper to tailor their bedding to their individual body temperature. Credit: Jan Woitas/picture alliance via Getty Images

Having individual doonas allows each sleeper to tailor their bedding to their personal body temperature. Hot sleepers can opt for a lighter cover, while cooler sleepers keep a thicker quilt — all without disturbing each other’s sleep.

Keeping your pets safe and cool this summer

Hot and humid weather can be tough on our furry (and feathered) friends. A few clever tweaks around your home can make a big difference: stock up on indoor plants, foil your windows to block the sun, create airflow with fans or open windows, and set up cozy cool spots for pets to retreat to.Sarah Zito, a senior scientific officer for companion animals at RSPCA Australia, called for pet owners to bring animals indoors whenever possible, even if they don’t have air conditioning.

“This is especially crucial for animals confined to cages such as rabbits, guinea pigs and birds as they can’t seek a cooler location on their own,” she said.

Sarah Zito from RSPCA Australia said pet owners should bring their animals indoors whenever possible, even if they don’t have air conditioning. Credit: Yui Mok/PA

Creating a ‘cool zone’ for your pets is a simple but effective way to help them stay comfortable. Offer them a choice of cool tiles or damp towels to lie on, and make sure fresh, cool water is always within reach, she said.

Spotting signs of overheating

Keep an eye out for warning signs like excessive panting, drooling, bright red or pale gums, or lethargy. These could indicate your pet is overheating and needs immediate attention.For dogs, it’s best to offer small amounts of water repeatedly rather than letting them gulp a large volume at once.”Avoid allowing your dog to rapidly consume a large amount of water as this could contribute to issues such as gastrointestinal upsets, bloating and aspiration.”

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