www.hvactechgroup.com - forums

does anyone know how to upload old manuals I have, rather than throw them out, im sure they would benefit someone.

Are they PDF manuals?  If not you would have to scan them into a PDF.  The manual forum is here,

https://www.hvactechgroup.com/hvacforum/index.php?board=16.0

If you create a new post and click Addition Options you're able to attach a file.