Refrigerators powered by (solar) heat

Climate-KIC Start-Up

Founding Year: 2015

Location: Germany/Berlin

Coolar is developing an innovative cooling system that is powered by (solar) heat rather than electricity. Wherever there is untapped heat – from sources like solar thermal or district heating – Coolar can provide a CO2-neutral cooling solution.








Based on nano-porous silica gel the Coolar technology uses an adsorption cooling process, which allows it to operate without harmful substances like cooling fluids or lubricants. Upon disposal the Coolar system will thus not have to be treated as hazardous waste like conventional cooling devices.

Initially Coolar aims to help people with insufficient access to stable electricity by providing a grid independent, environmentally friendly solar thermal refrigerator that enables reliable cooling of medicine and food. But ultimately Coolar wants to provide a green alternative to conventional cooling devices worldwide.

Berlin based Coolar is supported by a team of 8, who engineered and built a first demonstrator, which is currently being tested and optimised. An important next step is the financing and production of 5 additional prototypes for field testing in development projects in Africa, or in communities on remote islands in close cooperation with partnering organisations.

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This start-up is a finalist in the 2016 edition of Climate-KIC’s Venture Competition. Show your support by sharing this page and mentioning #BestClimateVenture.

  • Check out the other finalists and learn about Europe’s best clean-tech start-ups.
  • A clean-tech start-up entrepreneur yourself? Apply to the Climate-KIC Accelerator.

Venture Competition

Frankfurt, Germany

Climate-KIC’s pan-European Venture Competition awards Europe’s brightest start-ups that help fight climate change.

In the European final, 15 start-ups compete for €80,000 in funding in Frankfurt, Germany on the 8th November during the Climate-KIC Climate Innovation Summit.

Climate-KIC operates the world’s largest clean-tech start-up Accelerator focused on climate change.


Julia Römer
+49 171 9564 668

Team Members: Julia Römer (Technology), Christoph Göller (Business Development), Arno Zimmermann (Business), Kilian Mähne (Mechanical Engineering), Sandra Hoffmann (Mechanical Engineering), Stefanie Brauer (Mechanical Engineering), Melinda Mehling (Process Engineering), Alberto Gonzalez (Solar Thermal Engineering)