<http://schema.org/description>
"When a home&amp;#039;s heating or cooling systems fails, most home owners do not know what to do and call for a professional. Knowing some basic information about how heating and cooling systems work may help you deal with system mishaps by yourself. Take this quiz and see how good your knowledge of heating and cooling system basics is."^^<http://www.w3.org/2001/XMLSchema#string>
<http://home.howstuffworks.com/home-improvement/heating-and-cooling/heating-cooling-system-basics-quiz15.htm>