I think if you have your sofa 2-3 inches away from the vent you should be OK. Does your sofa have a back that slopes (is closer to the wall at the top than at the bottom)? This would help too.

Don't close off the damper to the register.

Your furniture should NOT be pushed up against the walls.

A couch that was open on the bottom would have been a good choice for this area. While a "deflector" will have some of the same effect as air blasting the back of the couch, they will help a little.

There is probably no reason, beside cost, that the registers can not be moved up, around the corner or to a different wall. Is there open basement below? What kind of walls are there. If you have typical drywall, It should be relatively easy. You could consider pairs of supplies high an low shutting off the high in the heating season and the low in the cooling season.

People complain that radiators interfere with furniture placement, good grief.

Agree. Don't push your furniture all the way against the wall and …

Consider adding casters or additional "feet" to the bottom of the sofa to enable some air flow there as well.

Budget permitting, you might get the vent moved a couple of feet so it is located in what appears to be a hallway to the right.

Put the sofa somewhere else. Since it's a long sofa, it's going to take up the whole wall. It's not gonna look good.

Thank you all for the advice! We never planned to have the sofa right against the wall but read we needed at least a foot of clearance. Unfortunately, we didnt think through the dimensions of this living room when buying the house and its caused all types of headaches - we can spare 3ish inches of clearance. The couch is 42” deep and there is only 11’ from that wall to the tv (not ideal but again was our only option). We’re stuck with the placement of the couch on this wall too. I was just about shy of listing the house bc of all the frustrations this room has caused! Thank you again!

Furniture placement is difficult and overlooked very frequently. This reminds me that my parents said that when they had their ranch house built in 1959 they asked the builder to to remove about 1/3 of the windows and the fireplace from the original plan. Mom said that there was no place to put the furniture! The other reason the windows were deleted is that brother in law who early was coal, and then a fuel oil and heat guy, always pointed out that he'd like the fuel contract for "that house" when he spotted one with a lot of windows as the group motored by.

Don't wring your hands about it too much yet. It might work just fine as it is. Just give it the space you can and see what happens while thinking very calmly about what you might do if you can't get enough air flow into that room. The other alternative to moving that supply up, down, or around the corner is to leave it be and install another supply elsewhere in the room. Really, if you have access to the underside, none of the duct/register changes are that big of a deal compared to lots of other things you might do to improve your comfort.

What does the bottom of the couch look like and is there a side that is pretty "blind"? If so, I'd be tempted to connect some flex duct to the supply and jury rig an outlet under the couch for temporary relief.

How big is your TV? The optimal viewing distance to an HDTV screen is 1.5 to 2 times the diagonal dimension. If the TV is 60 inches (5 feet) you should sit 7.5 - 10 feet away from it.

Post a sketch with dimensions of your room and the sofa measurements. Please show locations of the vents. It is more likely than not that the very creative posters here can find an alternate layout for your furniture that will work without blocking the vents. It is extremely important not to block the air circulation for your HVAC system.

Although is important to avoid blocking ducts, I still say try the couch where the separation from the wall is tolerable to you and see what happens before getting all in a lather about spacers, moving ducts, sawing the couch in half, or anything else. It might work just fine for you. Go ahead and try a deflector. I assume that they don't cost much. You could also fabricate one as a trial measure, but the heavy duty aluminum foil might cost more than the bona fide deflector. If a deflector does not improve the air flow situation, it might, at least, serve as a spacer enforcing the distance between the wall and couch.

Can the TV go on this wall and the couch go where the TV was?

How about placing a narrow sofa table behind the couch?

W have a deflector (up) on our heating outlet register which is behind the couch....makes the couch about 4 inches away from the wall. Had it that way all this past winter with no problems.

Similar issue - long wall, quad windows opposite the TV wall. Sofa had to be placed along it. There are two HVAC floor vent supplies, each end of sofa. Spouse built extenders (sheet metal) that fit over vent and channel the air under the sofa stopping just short of sofa edge. We painted them black prior to installation, nothing shows.

Very nice, jersey. It is simple, inexpensive and effective. Flex duct would probably be easier, but maybe it would make some subtle sound when flexing due to pressure changes?