The context
A retail chain had left its gas heating without maintenance. In January and February, the worst possible months, it broke down and stayed out of action for two weeks. A shop with no heating in winter is not just uncomfortable: customers stay away because it is too cold, staff work in poor conditions, and anything that depends on a stable temperature starts to suffer. Behind the shop, the temperature of the cold room had started to fluctuate, and that was the more expensive problem.
