@activistPnk i suggest a hot water bottle under a blanket
https://solar.lowtechmagazine.com/2022/01/the-revenge-of-the-hot-water-bottle/

also you may be interested in this guide for an electric heated table https://solar.lowtechmagazine.com/2024/12/how-to-build-an-electrically-heated-table/

@solarpunk