It seems like for the cost of the quiet room options you might consider renting practice space. This way you could carry in your guitar and amp and wail away with impunity. As an alternative, is there a university nearby that might give you a break on a price to rent a practice room from them. Surely their students aren't using them much right now!
Granted, not the comfort of home, but no tension worried about neighbors while you practice.
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"I go for a lotta things that's a little too strong" J.L. Hooker
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