I'll talk to the landlord and just straight up tell him, I think. I presume his opinion is either going to be either a fixed rate added to make up for it, or not really giving a fuck unless it makes a noticeable impact on the powerbill.
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And I just realized I never mentioned, but after waiting a number of hours for y'all to say anything I finally went ahead and ordered.
So on its way are:
Two reference 290X cards.
A Corsair Vengeance C70 case.
And finally a Corsair RM 1000 powersupply.
Hope to see it soon.