Finally have some pics of finished install.
Resummary of job:
1) Heating: In the basement, our ancient oil heating tank and furnace was removed and replaced with an American Standard Comfort R 2-stage furnace, with a 2-stage t-stat (thanks to all those who suggested the 2-stage tstat that was not originally in the install plan).
2) Cooling: All contractors assessed that our old ducting, design through the walls, and register placement would lead to inadequate cooling if placed in the basement, and would be particularly poor upstairs. So, new install was in the attic. Trane XL14i (3.5 ton) and variable speed air handler. Insulated flex duct was run to each upstairs room, and 3 returns (1 in hallway that most rooms are off, 1 return in between 2 interior rooms, and 1 in a larger bedroom in which the door is usually closed at night); 3 runs come to the 1st floor (2 through a closet and one through a corner), an additional supply is above the stairs on 2nd floor dumping down the stairs.
The manager in charge of the install is off for a week and I was away when the job finished, so I could not ask questions at that time. I would like to have any wrap up questions ready when he gets back. Any help is much appreciated.
1) Any over overall comments from looking at the install pictures. http://www.picturetrail.com/gallery/...8143&members=1
2) I posted a question earlier regarding a few small leaks in the attic flex duct, but did not have pics at the time. There a a number of small holes in the insulation where a very small amount of cold air escapes. If the pics capture it, a few of these are where clips are. Are these minimal leaks okay? If the flex duct was sealed well, should there even be leaks at all where the insulation is torn?
3) Two flex duct supply runs are set into the attic beams and held with metal brackets. It appears that the brackets squeeze the flex ducts pretty tight and I was concerned that this may constrict air flow. It does appear that air flow out of one of these supplies is low. Can/should the brackets be replaced with larger brackets?
4) The attic celing has many many long nails protruding. The two flex duct runs are set right up agains the nails. Where I could feel, the nails have not pierced the insulation, but is this a problem waiting to happen? I can't feel behind the bracket portion of the ducting where the pressure of the nails would be tight.