Someone has to be the Moral-Margaret here (or Negative-Nancy?), but I wouldn't recommend going too overboard on electricity that's included with your rent. If you start making changes to the wiring, or they see that you're using way too much power and costing them a fortune, they could try to evict you on the basis of electrical code violations, or the fact that you're essentially running a "business" there and it should fall under commercial leasing -which is much more lenient towards the landlord and eviction. Personally I would personally buy a couple R4's and claim that's how you're heating the place. Purposely taking advantage of someone and causing them undue financial harm for your own benefit (because they were foolish enough to include utilities) really isn't right.
Now to answer your question, the S7 would be the most cost-effective miner for hashrate, but they are incredibly loud. You could try to get away with lower CFM fans and down-clocking the S7's, it might put you ahead in hashrate vs the S9 or R4, which have been very unreliable anyways.
Thanks for your response, Finsky. I hear what you are saying. I guess the way I look at it, I already don't use much electricity compared to some other people's daily use of a hair dryer, rolling iron, flat iron, toaster oven, regular oven, etc. I know it's not the same, but there is a tradeoff.
Also, I'm never going to set up a large mining farm, even it if starts making money for me down the road. I expect I would only ever have the hash rate equivalent of two or three R4s. With the large restaurant operation, I don't think the owner will notice the increase in electrical use. Mine is tiny compared to his, and my apartment and the restaurant are all on the same power account. Plus, it would balance out in the winter, saving on his heating costs
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