Overwintering geraniums

I do (classic red pelargoniums) - they get cut almost to the ground and then go and live in my study which being unheated and on the north side of the house makes a far better pumpkin and winter plant store than study! They come back into the warm bit of the house in about late feb given a good water and then I wait to see what happens. I think mine are three years old now - but some are cuttings from the original plant.