Fighting fire with fire

Or perhaps fighting ice cubes with ice cubes would be a more adequate idiomatic expression for today. 

After a busy morning spent in the unheated home office in the attic, I could barely feel my toes or fingers. 
So I headed for a couple of dives in the harbour. It certainly put things in perspective. 
After cycling with the icy cold wind in my face, I welcomed the warm embrace of the sea. 
The attic-office felt positively tropical for the even busier afternoon session. 
Result!