This $40 Paint Cools Any Home 19°F FOREVER Since 1975!

A $40 gallon of white paint can cool your roof 19°F below surrounding air, at night, with zero electricity. This is the radiative cooling paint the AC industry filed in 1975 and Purdue rediscovered in 2021 — the same physics NASA uses on every satellite. A Stanford photonic stack, a barium sulfate pigment swap, and the 8 to 13 micrometer atmospheric window are why your roof is already connected, through 50 miles of transparent air, to the coldest thermal sink in the universe: 2.7 Kelvin deep space. We break down how it works, why commercial versions cost $250 per gallon, and how to mix a functional batch yourself for forty bucks — enough to cut summer cooling bills 20-30% on a 1,500 sq ft roof. Covers Ashwath Raman's 2014 Nature paper, Xiulin Ruan's 98.1% Guinness-record paint, why ASHRAE 90.1 blocks cool-roof credits above climate zone 3, the humidity and durability traps, SkyCool Systems, CryoPaint, and the DIY recipe hitting 90+% reflectance. *Build the paint yourself* (As an Amazon Associate I earn from qualifying purchases. The product links below earn this channel a small commission at no extra cost to you.): 🧂 FOOD-GRADE BARIUM SULFATE — The 60% volume pigment that does the cooling. Pottery suppliers (US Pigment, Sheffield) beat Amazon per pound on bulk. https://amzn.to/4wnITvy 🎨 TITANIUM DIOXIDE POWDER — Small-volume UV reflectance boost. Cheaper at chemistry supply shops in 5+ lb bags. https://amzn.to/42oryEU 🪣 EXTERIOR ACRYLIC WHITE PAINT — The binder base. Never alkyd — it yellows. Home Depot stocks wider sizes. https://amzn.to/42XR2Jq 🔫 WAGNER AIRLESS PAINT SPRAYER — Nails even coverage on roofs and condensers. Harbor Freight undercuts Amazon 15-25%. https://amzn.to/4cZoC7W 🌡️ INFRARED THERMOMETER — Point at your roof before and after. Watch the 8-19°F delta appear. https://amzn.to/4d0qhKt 🧪 DIGITAL HYGROMETER — Humidity above 45% disables most radiative cooling paints. Check first. https://amzn.to/4dbqGbP Chapters: 0:00 - The Hook: $40 Paint Replaces Your AC 0:25 - Stanford 2014 Photonic Stack Breakthrough 1:05 - Purdue's Barium Sulfate Rewrite 2:09 - The 19°F Field Test (Day and Night) 3:29 - NASA's 50-Year Head Start 4:14 - The Sky Window 5:12 - Your Roof and 2.7 Kelvin Deep Space 6:44 - The 1975 Italian Paper Nobody Read 8:09 - Why Your Roof Doesn't Have It (ASHRAE 90.1) 8:51 - Durability and Humidity Traps 10:17 - SkyCool Systems (Commercial Option) 10:56 - CryoPaint and Consumer Paints 11:24 - The DIY $40-Per-Gallon Recipe 12:11 - Bill Math and Fine Details 14:21 - Outro: The $300 Tunnel Video Subscribe: https://www.youtube.com/@SketchySurvival101?sub_confirmation=1 Sources: Raman, Anoma, Zhu, Rephaeli & Fan, "Passive radiative cooling below ambient air temperature under direct sunlight," Nature 515, 540–544 (2014) https://www.nature.com/articles/nature13883 Li, Peoples, Huang, Kanj, Yang, Ruan, "Ultrawhite BaSO4 Paints and Films for Remarkable Daytime Subambient Radiative Cooling," ACS Applied Materials & Interfaces (2021) https://pubs.acs.org/doi/10.1021/acsami.1c02368 Purdue University press release on record-breaking white paint https://www.purdue.edu/newsroom/archive/releases/2021/Q2/the-whitest-paint-is-here-and-its-the-coolest.-literally..html Guinness World Records — Whitest Paint https://www.guinnessworldrecords.com/world-records/659962-whitest-paint Catalanotti et al., "The radiative cooling of selective surfaces," Solar Energy 17: 83–89 (1975) https://www.sciencedirect.com/science/article/abs/pii/0038092X75900626 Harrison & Walton, "Radiative cooling of TiO2 white paint," Solar Energy 20: 185–188 (1978) https://www.sciencedirect.com/science/article/abs/pii/0038092X78901950 Zhao et al., "Radiative sky cooling: Fundamental principles," Applied Physics Reviews (2019) https://pubs.aip.org/aip/apr/article/6/2/021306/570227/Radiative-sky-cooling-Fundamental-principles CNN Business on SkyCool Systems https://www.cnn.com/2021/08/09/tech/radiative-cooling-skycool-electricity-environment NASA Small Spacecraft thermal control https://www.nasa.gov/smallsat-institute/sst-soa/thermal-control/ Tags: DIY cool roof paint, cheap radiative cooling hack, cool your home without air conditioning, off grid cooling, how to cool a roof without electricity #radiativecooling #coolroof #whitepaint #diycooling #bariumsulfate #purduepaint #passivecooling #offgridliving #skywindow #deepspacecooling About This Channel Sketchy Survival 101 explores the physics behind survival, off-grid living, and forgotten engineering. Every video is researched using peer-reviewed studies, government data, and verified historical records. Nothing in this video constitutes professional advice. Always consult qualified professionals before attempting any project.