About: http://webisa.webdatacommons.org/375908690

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	4, 2012 4, 2012 Changing filters regularly is an important part of maintaining a heat pump system. | Photo courtesy of ??iStockphoto/BanksPhotos Operating and Maintaining Your Heat Pump Want to get the most out of your heat pump?
http://www.w3.org/ns/prov#wasQuotedFrom	osti.gov