One is that, our upstairs bedrooms have very low airflow coming out of the ducts. We have a split level house, and the furnace blower is in the bungalow part of the house. The basement in the bungalow part of the house has a 7' high ceiling. The basement in the two storey party of the house has about a 3 1/2' high ceiling.
The furnace feeds the upstairs bedrooms through ductwork that goes through the concrete block as shown in these photos (apologies for the poor quality pics):
I had an HVAC guy come yesterday to suggest that there is a lot of airflow lost before the air even gets past the concrete block, due to the way the ductwork angles up from the furnace, and then angles down at about a 45 degree angle. He suggested that smoothing this out will significantly improve airflow, in addition to applying mastic on all duct joints. Right now it's quite obvious that the old foil tape, and complete lack of sealant in other ductwork joints, is probably contributing to loss of airflow.
At this point I need to validate the theory that the ductwork coming out of the furnace, and then angling down, is contributing to a large loss of airflow. I'll get some additional perspectives on the issue.
Edit: Shannon over at house-improvements.com agreed 100% with the HVAC guy who came to the house. As I trust Shannon's advice a ton, I feel good about making this improvement and will likely go ahead with doing it.
The second issue is about rerouting the ductwork in the basement. I'll post about that one separately.
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