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  • Ask the Builder. "Heat Pump Facts." 8/21/2008. http://www.askthebuilder.com/B294_Heat_Pump_Facts.shtml
  • BGE. "How Heat Pumps Work." 8/6/2008. http://www.bge.com/portal/site/bge/menuitem.caa6f77e2c573a0021b08424025166a0/
  • Cost Helper. "Heat Pump Cost." 11/2007.
    http://www.costhelper.com/cost/home-garden/heat-pump.html
  • Enercom. "Heat Pumps." 8/6/2008.
    http://www.energyright.com/heatpump/index.htm
  • Energy Star. "Air-Source Heat Pumps." 8/7/2008. http://www.energyright.com/heatpump/index.htm
  • Energy Star. "Geothermal Heat Pumps." 8/7/2008. http://www.energystar.gov/index.cfm?c=geo_heat.pr_geo_heat_pumps
  • Environmental Protection Agency. "What You Should Know About Refrigerants When Purchasing or Repairing a Residential A/C System or Heat Pump." 6/3/2008. http://www.epa.gov/Ozone/title6/phaseout/22phaseout.html
  • Heat Pump Centre. "Heat Pumps in Industry." 6/30/2008. http://www.heatpumpcentre.org/About_heat_pumps/HP_industry.asp
  • Home Tips. "Heat Pumps." 8/6/2008.
    http://www.hometips.com/heatpumps-airsource.html
  • Home Tips. "Heat Pump Repairs." 8/6/2008. http://www.hometips.com/cs-protected/guides/heatpumpfix.html
  • Michigan Energy Services. Personal interview. Conducted 8/21/2008. http://www.energypath.com/
  • NZPA. "Heat pumps blamed for power bill rise." The New Zealand Herald, 8/1/2008. http://www.nzherald.co.nz/section/1/story.cfm?c_id=1&objectid=10524722
  • Wheeler, Jim. "How Heat Pumps Work." HGTVPro.com, 8/6/2008. http://www.hgtvpro.com/hpro/dj_technology/article/0,,HPRO_20157_4074516,00.html
  • U.S. Department of Energy. "Heat Pump Systems." 9/12/2005. http://www.eere.energy.gov/consumer/your_home/space_heating_cooling/index.cfm/mytopic=12610