Imagine you're transported back in time, say, one hundred years. The iceman drives by daily in his horse-pulled wagon. He reads the sign in your window -- yes, you do need ice today -- and hoists a slab into your icebox. Without his visits, your food rots.
In just a few generations, much has changed. Today, we depend on refrigerators and other devices that regulate temperature at home and at work. And instead of the iceman, we turn to the pros who know how to install and repair these appliances.