not sure why you would need it
We have a CYV with vaulted ceilings in most rooms, built in 2006, have found our utility bills, both for heat and a/c, to be quite reasonable, and comfortable as well. We had an energy audit several years ago, and it found the insulation to be ok. We have gas heat, which I'm guessing you do too if yours was built in 2007.
Doesn't seem worth the trouble, except perhaps about the lanai, since you've enclosed it. But still it will likely feel cold on the really cold days and hot on the really hot days, I would think, unless it's getting a lot of sun and/or shade.
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