 We've all experienced the warmth of the sun on a cold day. Harnessing this heat for a useful purpose, such as heating hot water or building, is a job for a solar thermal system. Wyoming's sunny climate provides an excellent solar thermal resource, especially cold sun. We have many cold, but sunny days. The new UW Visual Arts Center has a very large installation. It is used to heat the building in the winter. Much smaller systems, using one or two panels, can be used to heat a portion of your domestic hot water. In many Wyoming homes, heating hot water consumes 10 to 20 percent of the overall energy used, more than lighting or refrigeration. Both flat plate and evacuated tube systems, like the ones on the roof of the Visual Arts Center, can be used to collect and concentrate thermal energy. The different styles have advantages and drawbacks, but both can be cost-effectively used in Wyoming. A solar thermal system is just another way to enjoy Wyoming's sunny climate. For the University of Wyoming Extension, I'm Milton Geiger, Exploring the Nature of Wyoming.