I have a bonus room over a triple car garage in a 15 year old house. The room was finished with the original build and had HVAC and insulation throughout. I am in the process now of removing my garage ceiling and the batt insulation to have foam insulation sprayed into the floor joist cavities for air seal and Rvalue. I'll also be beefing up the knee walls with spray foam.
Before I do this though I want to be sure HVAC is proper. The total area is a master bedroom, ensuite and sitting area. The sitting area and 1/2 of the ensuite are over the garage. The three areas are supplied by nine 4inx10in floor ducts. There are two 4x10 wall retun grills in the BR and one 4x10 return in the bonus.
I am wondering of there is insuffiecient return air relative to supply air and this is adding to the comfort problem in the bonusroom. Since I have the garage ceiling open I am wondering if I need to modify return air before I foam and redrywall it as it would be a bear to do this later.
Add to this is the fact the bonus room is at the extreme far end of the house from the furnace/AC which is in the basement as well.
Any ideas on the HVAC design here?
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