Geraniums are flowering!

The geraniums I put in the garage, which I had heated with the excess from the boiler room until recently (when the cold water pipes almost froze noted earlier), are flowering! I watered them today and voila, there were a few white flowers leaning towards the sunny windows. I was afraid they whole plant had been killed with the extreme cold we've had lately so it's a nice surprise to see it doing so well!