It's still no mini-split, but I could see sealing up the leaks helping slightly with the effectiveness. Not that it's particularly needed since at least for the insulated 19' the 11.5KBTU is kinda overkill. I'd be surprised if the noise changed much though - that's mostly compressor vibration as far as I can tell.
Also, on the second video I'm pretty sure he just put the radiant barrier side of that foam block on the cold side instead of the warm side. Oops.
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