Hacker News Reader

DIY forum, https://ecorenovator.org/forum/

HVAC blog, https://www.energyvanguard.com/blog/

HVAC pro forum, https://hvac-talk.com/vbb/

Heating forum, https://forum.heatinghelp.com/

https://buildingscience.com/document-search

https://constructionphysics.substack.com/

https://www.greenbuildingadvisor.com/

In another comment I mention how overwhelmed I am by all this stuff, so maybe don't take it from me, but when I've been searching for answers about stuff like best practices for windows or replacing my furnace with a heat pump, greenbuildingadvisor.com seems to come up a lot and seems pretty good. That said, much of it is behind a paywall that's quite expensive, and I've been waiting to save my free trial for the optimal moment.