Do you mean a ground source heat pump? What is the lowest temperature there?

Penpot is quite easy to use and show a presentation in. Use unsplash or pexels for images and the prototype view for presenting. If you’re not looking for FOSS there’s a lot of AI presentation tools out there.

Unfortunately I’ve heard that a lot of people especially from academia are moving to bluesky. I’ve already started talking to some people I know about Mastodon. I hope the word spreads around.