Robbyn and Suzanne, For a moment I completely misread the heading on your message as Museums IN heat ! Now there's a thought for a Museum-L topic. On the subject of airless vestibules etc, I must express surprise at the lack of airconditioning in many of the major London Museums especially in back of house work spaces. Perhaps they are just not used to recurring heatwaves. I was in that fair city a month ago and the temperature was most unpleasant and still. Currently in New Zealand we are sitting by open fires ( not in the museums I hasten to add) as the last storms of winter pass through. Cheers, Roger Smith [log in to unmask]