I think, starting now and thinking longer-term, you would have better luck running a kind of ghetto, distributed server farm for more general-purpose uses, which, for most profit, would likely be GPUs brute-forcing passwords. Whatever you're mining on (except maybe GPU-dominated algorithms, where electricity will remain a factor and today's hardware may still bring in significant revenue) likely will produce practically nothing within three winters and may not RoI even with it subsidizing your heat costs.
That said - ASIC prices will continue a downward spiral until electricity costs in running them becomes a real concern again rather than just worrying about initial cost and whether they'll RoI within the first six months before they become practically useless. Maybe, then, this idea is The Idea, but it might be good to wait at least a couple more years.
We also run GPU scrypt machines, it is an option to take into consideration... thanks!
