Hello everyone first time poster here.
I am in the process of sealing up all my ductwork in our 7 year old rambler home in central Minnesota. A little background... 2700sf rambler forced air system with transite basement heat. (ductwork under concrete and floor vents in the basement. We had a Carrier Infinity 96% furnace and infinity T-stat installed last year for 2 reasons. 1~ replacing our 80% furnace should save us on propane. (96% is more than 80% right, grunt grunt!) and 2~ We were told that the Infinity features a DC induction and blower fan that will provide a higher static pressure to force the warm air down and thru our basement vents for more even basement heating.
Let me tell you I was amazed at how many gaps and spaces I found in the duct seams and joints while crawling around within the suspended ceiling of my basement. I am using a duct mastic and painting it on every joint and seam paying close atention to plenium joints. I tend to be sort of a perfectionist so no gap will go unnoticed.
So I fugure I have about 2/3 of my system sealed and never noticed how many dampers are in the system. Probably one just before each register, plus 1 on each the main supply and return plenium, and 1 feeding the transite plenium. So I'm thinking that I will get better flow If I have wverything wide open for better flow, but now I'm thinking I may have thrown things out of balance.
My thermostat is pretty cool and will show me the static pressure and CFM as the furnace is running. I show 0.76 static with everything wide open and a brand new 5" media filter. So what the heck does 0.76 static pressure really mean with this system? And how can I balance things more accurately than "this room feels colder than that room" I have access to magenahelic gages that I can fit to my supply and return pleniums.
I would love to get everything adjusted so ideally we are comfortable during the heating season as well as the cooling season without having to make damper adjustments, although I wouldnt mind having a summer setting and a winter setting and have to switch damper positions 2x a year. Just trying to get things more betterer.