A/C vents in floors?
I have an older home (1927 rowhouse) that had central air conditioning installed in the 1980s but we are doing a major renovation that involves opening ceilings, walls, and floors and are replacing and completely re-working the AC. The ductwork formerly snaked all over the attic with vents in the second floor ceilings; we are converting the attic to living space and burying ducts in the walls and ceilings. We have hot water radiators so the ductwork is A/C only.
We had hoped the ductwork would be unobtrusive but what we didn't even think about was placement of the vents. The A/C subcontractor starting installing ductwork yesterday and it looks like he is running ducts under floors so the vents will be blowing cool air up from the floor. Aside from this seeming extremely inefficient, it's a concern with furniture placement (one of them is right where we were going to place a desk, in a room that doesn't have many furniture placement options!). Aren't A/C vents usually placed in the ceiling or high on a wall? I know our neighbors had a similar setup but their system was installed with minimal disruption to the house and they had fewer options. How often are A/C vents placed in floors? Does this make sense? Does it compromise the efficiency of the system?
I'm going to talk to our architect and general contractor about this--I'm not sure how well they have been coordinating with the A/C guy but I'm starting to think our architect did not at all provide well for the ductwork when drawing up the plans. (Placement of the air handling unit has been another issue, but I realize that's often problematic and it looks like it's something we're going to have to live with.)