Great site. I especially like the idea in your picture. There's a huge amount of waste in the HVAC industry. Just today I looked in the ceiling of an entire office floor that's about to be remodled - dumping all of the existing equipment and replacing with new stuff. The
VAV boxes had a manufacturing date of 1992 and still looked shiny and new. Think of the fun you could have with a bunch of these (all they do is open and close based on a 0 -10 volt signal - although some have fans (even better!)), scrap ductwork, a few thousand pingpong balls, and an
auger.