Over Wintering Annual Geraniums

I know an older gentlemen who literally has around 100 geraniums (in Canada) and he lifts his, shakes off all the dirt (air dry) and puts them upside down in a box and closes it. He said mid-winter he goes up and trims off all the dead and any soft spots, lets them drink and then puts them back in the box and mid March he digs them out and pots them up under a light or in a window til time to take them back outside. Thinking of keeping one color of each potted (I grew 16 from seed this year) and then doing this box method with all the rest.
 
I am owned by 2 dogs that demand all windows free of clutter. I have given up on shades and curtains; plants would last 1 hour. Storing them barerooted is what I would like to try. When should I dig them up? Is anything like newspaper or peatmoss use in box? Have learn a lot here Thanks
 
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