Common sense would dictate a proper exchange of fresh air during winter to prevent the build up of stale air, bacteria and mould spores all of which affect the elderly in disproportion to the rest of the population...unfortunately common sense is being replaced in the ageing population by a I know F all about anything and am really proud to tell the rest of the world just how thick they are...still its their funeral, quite literally...is that another cold you have harold, that's the third one this month.