http://www.agardenforthehouse.com/2013/08/how-i-restore-propagate-geraniums-for-winter-bloom/
Thanks! I have been perusing the "hang 'em high, hang 'em dry" technique, wherein you knock off all the soil from your treasured Pelargonium, trim off any dead leaves or flowers, and hang it roots-up within a paper bag in a cool area--like my storage space, which I never saw any radiators or such in. Having that in mind, I just came back from Trader Joe's (where I enjoy shopping anyway). Upon hearing that I needed a paper shopping bag to provide amusement for my little kitty Zizu and some additional for my geranium preservation project, the clerk handed me over more than enough for the task, with a smile. I did this one year and was successful (you must take the plants down and soak them for an hour once a month, then hang them back up), and did it the following year and had nothing to show for it (because I neglected the soaking for a month or two). This year, I will try to be more diligent and do my monthly soakings.