Matt Ferrell from Undecided explores MIT’s passive cooling breakthrough called ICER (Insulated Cooling with Evaporation and Radiation), which combines three ancient cooling principles into one aerogel-based system requiring zero electricity.
Key insights:
ICER achieved 9.3°C below ambient temperature under direct sunlight — a 300% improvement over standalone radiative coolers — using just aerogel, hydrogel, and a reflective base layer.
The system runs unattended for 4–30+ days on a single water charge, and could extend food shelf life by 40% in humid regions and over 200% in arid ones.
Air conditioning currently consumes 20% of global electricity, with units projected to triple by 2050 — and HFC refrigerants are thousands of times more potent as greenhouse gases than CO₂.
Scaling remains the key challenge, as aerogel production costs up to 10x more than conventional insulation, though cellulose-based alternatives using freeze-drying show promising scalability.