Solar hot water as good in Wisconsin as Arizona

From the Web site of the Sustainable Green Bay Initiative:

Did you know that a home solar water heating system is just as efficient here in Wisconsin as one is in Arizona? Even though Arizona gets more sunshine than Wisconsin, our colder water temperatures mean the solar device works just as efficiently. A solar water heater can save about 65% of the energy from a conventional water heater. The solar collector can be installed flat on a south facing roof and look from the ground like a skylight.

Learn more at the Solar Hot Water Workshop, August 6 in Appleton.