I'm not sure that is the case. Looking at something like the BioSphere[1] but without the hard core (we have to seal it) mentality) there is some evidence that reasonably environmentally immune living situations could be created.
and passive solar input through the glass space frame panels covering most of the facility, and electrical power was supplied into Biosphere 2 from an onsite natural gas energy center.
Furthermore, it probably won't be able to heat itself enough when the surroundings cool down below a certain treshold, something that could very likely happen when a new ice age hits.