Well, we'll just have to hope the radiators do the job. When you look at any older style Spanish house they always have fireplaces- usually large in the lounge area so its clear they have always had the odd chilly snap. We'll also have some rugs, and a carpet runner for the hallway at some point, for the winter. Think its probably true that tile flooring is part of the problem. Once on holiday on the costa del sol my young son opened a bulging over stairs cupboard and was swamped in rugs, duvet's, blankets and two small calor gas heaters!!