So, get windows which point the right ways, make sure the house is VERY well sealed and insulated, invest in tripple-glazed windows and so on.

note: this is often a really, really bad plan in an older home. older homes are built with different materials (lime mortar rather than cement, for example) and work on the principle of managing, rather than excluding, humidity. sealing them too well will result in structural degradation on a rapid scale, as moisture is trapped in them. you just have to suck it up and wear a wooly jumper and keep them cooler in winter...