
Develops off-grid medical refrigerators, powered by solar heat instead of electricity.

Coolar UG (haftungsbeschränkt)
Wolfener Str. 32-34, Haus C, 12681 Berlin · Torgauer Straße 12, BerlinNew on Amplifa
About Coolar
Coolar UG is a Berlin-based cleantech company that develops off-grid cooling systems. Its core product is a medical refrigerator based on an adsorption refrigeration process using silica gel and water in a vacuum system, powered by heat at around 60 °C from solar thermal energy, district heat from combined heat and power, or waste heat. The main target application is the reliable cooling of vaccines and medicines in regions without a stable power grid; energy is stored in insulated hot water tanks rather than batteries. The system operates without harmful refrigerants and lubricants, without batteries, and without moving wear parts. In addition, Coolar offers the Camping Cold Box, a battery-free mobile cool box. The company was founded in 2016 and is registered at the Charlottenburg Local Court under HRB 178139 B.
- Site
- Berlin
- Processes
- Off-grid medical refrigerators (adsorption cooling with solar heat), Mobile camping cool box
- Materials
- Adsorption refrigeration process (silica gel/water), Solar thermal energy / district and waste heat
- Founded
- 2016
- Employees
- 11–50
- Industries
- Medical technology / Healthcare, Refrigeration technology / Energy process engineering, Cleantech, Outdoor/Camping
- 01
Technology development & prototyping
- 02
Manufacturing/industrialization with partners
- 03
Assembly of the cooling system
- 04
Sales of medical cooling & camping products
Technology & Processes
Adsorption refrigeration process (silica gel/water)
Vacuum system that generates cooling from heat starting at around 60 °C, without refrigerants, batteries, or moving parts.
Solar thermal energy / district and waste heat
Heat source for operating the cooling systems as an alternative to the power grid.
Locations
Berlin
DEHeadquarters, technology development
- Materials
- Adsorption (silica gel/water)
Products


Inside the production



Industries
Additional services
History
- 2014
Julia Römer initiates Coolar.
- 2016
Company founded as Coolar UG (haftungsbeschränkt) in Berlin.
- 2018
Europe Finalist at the Cartier Women's Initiative Awards.
- 2020
SET100 Award Winner (Start Up Energy Transition).