Another alternative I mention all the time to those with high electrical costs and noise restrictions is to get your miners hosted. If you're sending them off to a colocation that is trusted, there's relatively little risk involved, and it comes with all the benefits of home mining minus noise (and most colocations have very reasonable electrical rates, though there are maintenance fees in some areas).

As of right now, most colos I know of that I trust are near or at capacity, but this thread contains details for several hosting companies. Whether or not they're to be trusted is your decision in the end.