And I set the DIP switches for 400 cfm per ton based on the compressor ... “What’s the second way adding return will save energy?” “It will reduce the pressure across those return duct leaks that you ...

Yes, its Halloween time again and the hacks are going to be crawling out of the woodwork for the rest of the month. [Rich Osgood] is off to a good start promising one hack every week until Halloween.

Negative pressure in a return duct would be taken on the low port of the manometer, as this pressure is lower than the room reference pressure. It’s easy to forget to switch the hose as you move from ...