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COOLING WITHOUT AIR CONDITIONING
In 2021, researchers built a two-layer polymer film that cools like skin; under direct sun, it stayed about 7°C below ambient with 150 W/m² cooling powerResearchers have created an advanced cooling film comprising two innovative layers that harmoniously integrate both radiative and evaporati...- In 2025, researchers built a box from porous PMMA sheets that reflected 96% of sunlight; 80°F outdoor air measured 65.3°F inside without electricityInnovative materials scientists are exploring passive cooling techniques to lessen the demand for air conditioning. They have engineered a ...
- In 2020, researchers tested a self-moistening hydrogel mat under solar panels; it cooled them by at least 10°C and boosted output by up to 19%New research introduces a cooling gel for solar panels. This gel absorbs moisture at night and releases it as vapor during the day. The coo...
- In 2025, Czech researchers reported 2024 summer tests of green facades; one Holešovice site recorded 6.4K lower mean radiant temperature than a white wallGreen facades play a significant role in regulating outdoor thermal conditions, although their effectiveness can significantly differ. A co...
- In 2024, a Nature Sustainability study tested radiative cooling film on crops; field trials lowered air temperatures by up to 4.6°C and increased biomass by up to 370%Innovative films designed for dryland crops are making a remarkable impact by minimizing heat and water loss. These films effectively permi...
- In 2023, Princeton researchers tested a naturally ventilated cooling box; it stayed below outdoor air while using radiative cooling and buoyancy-driven airflowResearchers have unveiled a groundbreaking cooling technique designed for buildings that eliminates the need for traditional air conditioni...
- In a 2025 study, Penn State researchers tested porous PMMA sheets that reflected 96.4% of sunlight; a test box stayed 14.7°F cooler than the outdoor airInnovative researchers have crafted a groundbreaking porous plastic sheet that cools without any electrical input. By reflecting sunlight a...
- In a 2011 Las Vegas test, a 15.24-cm wet roof pond lowered indoor peak operative temperature by about 8.5°C versus the outdoor maximumIn the summer of 2011, a groundbreaking building in Las Vegas experimented with roof pond cooling. Results indicated that wet roof ponds ef...
- UPenn researchers copied elephant skin in porous cement tiles; a mockup home stayed near 32°C versus 42°C and 52°C with commercial stucco surfacesResearchers developed innovative cement tiles inspired by elephant skin for passive cooling. These tiles feature engineered cracks that abs...
- MIT built a three-layer passive cooling panel of aerogel, hydrogel and reflective material; tests cooled it 9.3°C below ambient and suggested up to 40% longer food storage in humid conditionsResearchers have created a passive cooling system that uses natural processes. This innovative device cools significantly below ambient air...
- In 2023, researchers found shade cooled Singapore streets by 0.8°C across 20 sites. Today, vegetation is estimated to save 228 GWh of energy yearlySingapore's trees offer significant cooling benefits for city streets. Shaded areas were found to be cooler, reducing heat stress for peopl...
- Illinois researchers tested a passive cooling film in Houston; treated metal roofs measured more than 40°F cooler in direct sunlightAs American summers heat up, public health risks escalate, prompting researchers to create an innovative coating that cools metal roofs by ...
- In 2024, Phoenix started its very first 24/7 cooling and heat respite center to provide life-saving refuge from extreme desert temperaturesIn 2024, Phoenix started its very first 24/7 cooling and heat respite center to provide life-saving refuge from extreme desert temperatures...
- 8 Simple tricks to improve ventilation and cool down your room without ACStruggling with a stuffy, muggy room? Poor ventilation often shows up as musty smells, condensation or mould, but fixing it doesn't require...
- A 1960s house in South London is staying 10C cooler than outside without air conditioning during extreme heat. It acts like an insulated flask maintaining a cooler temperature indoors by keeping heat outsideA 1960s ex-council house in south London stayed 10C cooler than outside during a 35C day without air conditioning. Architect Marion Baeli s...
- Long before air conditioners, Americans used ‘white gold’ and other clever methods to keep themselves coolIn a time before air conditioning, Americans became innovative in their quest to stay cool. Architectural elements like high ceilings and s...
- Stanford ran water beneath mirror-like rooftop panels; they cooled it 3–5°C below the surrounding air by sending heat into spaceResearchers at Stanford have created innovative panels that cool water exclusively using sunlight and mirrors. These panels effectively ref...
- In 2024, scientists tested a zigzag-shaped wall prototype; it was up to 3.1°C cooler than a conventional radiative-cooling wall in outdoor testsEngineers have created a groundbreaking zigzag wall that cools itself through a unique design. This structure lowers its temperature by dir...
- A reflective roof coating reduced peak roof temperature by 14.1°C and indoor temperature by 2.4°C; later research found evaporative cooling could add further benefitsInnovative roofing technologies are changing the game for building temperature regulation. By utilizing white reflective coatings, sunlight...
- A cement-based paint that "sweats" water kept a model house more than 4.5°C cooler than conventional white paintInnovative researchers have unveiled a remarkable paint designed to keep buildings cooler by absorbing moisture. This advanced formula not ...
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