I increased R 30 by adding six inches myself as a DIY project, the payoff was something like nine years but only because I did it myself.
I certainly would not add insulation if I only have Solar Guys pricing. The payoff just isn't there.
I noticed no difference in home comfort. Although this is subjective I consider myself a good reference. As a burn victim/survivor I feel subtle temp differences and drafts that normal people don't. It just wasn't there with more insulation.
The true test is I did not add extra insulation on my current house. I have no regrets.
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