We have a rectangular ranch home that's a bit raised and has a walkout basement. Off to the south side we have an addition that is about the size of a garage. It's unfinished basement space below and the upper floor that connects with home is ~7 foot ceilings with the following layout (doorway on left is north connecting to home). It is 22x12 feet, maybe a bit larger:
https://s30.postimg.org/5w6doei9t/Den_Setup.png
The rid square is the current register that goes to the room that is not sufficient for the large space, 3 exterior walls and all the windows. The lower left (west) side wall has a sliding glass door. Next to that is the fireplace with a built in to the side of it. Next to that (and above the built in) is an awning style window, so high up and only 2 feet tall. The two windows on the top of the image (east) are both awning style. The window on the right is also a short window, but horizontal sliding type.
The analysis done by the HVAC guy is that we need an additional 3 supply vents. I don't think he's putting return vents. We have 1 large return vent in the center of the home on a hallway.
Anyway, what would you recommend? HVAC guy is currently recommending 2 more on the eastern wall for 3 in total along that side. Another near the sliding glass doors on the western wall.
Does that sound good? Should we place them directly below the windows? Even with the existing vent (for some reason) not exactly centered but closer to the one window.
Any value in putting something in the far southwest corner?
The vent in front of the sliding glass doors I imagine would be better closer to the fireplace (the opening is closest to the northwestern corner) so not in the way of the doorway portion.
Also, should I be discussing a return vent?
Any and all help appreciated. Thanks!
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