My parents come and stay with us for a few nights every six weeks or so. They sleep in the spare room - the bed is rarely slept in between those visits. Every time they come, they want the bed to be 'aired' in advance, which basically involves turning the electric blanket on for maybe four or so hours on the day that they come. Not so that it is warm when they get into it, just so that the bed is 'aired' in readiness. The room is heated, radiators in there that heat the room just like the rest of the house.
Its no hardship, and I always do it so that they have peace of mind, but I've never heard anyone else ever talk about airing a bed. Anyone else?