I think it is good that "debate" is taking place, it didn't used to happen on this site. It doesn't matter how much research you do nothing can prepare you for the shock of a spanish winter.
I probably spend at least the same amount on heating as I did in the UK, been here so long can't compare but the price of wood is more expensive than Scotland and Holland. Wood-burners are not miracle heaters, mine is a large norwegian one but it only heats the one room. Before you suggest that there is something wrong with it I have been in many other houses and their burners doesn't warm all their houses either. Unless you are VERY hardy every house in Spain needs central heating. I hate humping wood around and can't wait to see the end of winter. Also have central heating but need a really good duvet to sleep well.
When I was a student in sevilla my boyfriend invited me to his parents house for semana santa. Although fairly rich the only heating was some sort of convector heater. I slept in a jumper and jeans for 3 nights.
I don't understand what it is with spanish houses why they should feel so cold. In winter its possible to sit out some days in short sleeves but enter the house and have to put on a wooly. Maybe apartments are warmer but agree with Frank
I couldn't stand the noise.