air

To all HVAC commercial specialist out there, we've been preparing for 12 year renovation of 5 story hotel in West Virginia and the owner wants us to include in our bid eliminating negative air pressure in the building. It's not our expertise but thought I will post out here to get some feedback...

Hello, I am feeling some very cold, outside cold feeling air coming from the ceiling where the cold air return is. Any idea what would be causing this? -- the air feels like a small breeze and the temp is very very cold, like the air outside, it was 28deg. here today. Any idea what this could...