No matter what part of the country you’re in, you’ve probably already suffered through a few warm days this year. It won’t be long before the weather turns really sultry, and your customers are going to start thinking about their air conditioning systems. The chances are good that several of those systems didn’t make it through the winter. If R-12 is unavailable in your area, or has become too pricey, you’ll have plenty of prospects for retrofits to R-134a.