[RKDinOKC]

Hope you actually get some help this time.

Thanks for the this old house zone video. Lead me to bunch of others too.

That pneumatic bladder system looked pretty neat for zoning an existing system. I liked it having thermostats in each room. That system would have really helped with my hot room situation! They only talked about distribution and not having a bypass or managing the returns.

One showed by measurements on a closed system that bypass ducting did not cause any less current draw but was actually wasting energy by circulating treated air back into the evaporator and not focusing the treated air on the zone being distributed to. There were comments about how not putting in a bypass made the zone being treated being very noisy because of the higher velocity of the air flow. Described their house as sounding like it was going to take off.

Another showed the proper way to set up and calibrate the bypass and how inefficient a system with a bypass installed backwards would always be open and was not letting enough air flow to get to the house ducts.

Another showed the importance of a balanced system. With a hallway return he measured the air pressure in a room, then closed the door and show how the air pressure in the room increased significantly and the pressure decreased in the rest of the house. Explained this was causing problems because the pressurized room was leaking treated air out of the system, windows, etc. AND the lower pressure in the rest of the hose was drawing from outside in thru the returns making the system treated new untreated air.

Another showed how most houses were improperly sealed and insulated. Showed places treated air was being leaked into the attic. Gave an example of snow melting on the roof due to the heat in the house leaking into the attic and the damage it caused. Showed bathroom vent fans should be vented to the outside and not just the attic. And needed a damper to keep the outside air from coming in thru them. I know my insulation could use a tune up.

My conclusion to be the most efficient right now is the keep my unused rooms doors and registers open. My system right now doesn't seem to be having any trouble maintaining a 32°F difference with triple digit temps outside.