Peltier element for heating and cooling:
https://www.meerstetter.ch/compendium/heating-and-cooling-with-a-peltier-controller
uses peltier tecknology... see log book 21.10.19
https://www.warneronline.com/med-systems-open-perfusion-microincubator-pdmi-2
Thermo scientific:
https://www.thermofisher.com/no/en/home/life-science/lab-equipment/co2-incubators.html