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Sources

• http://www1.eere.energy.gov/inventions/pdfs/retrozoneimpacts.pdf.
• http://www.eere.energy.gov/buildings/info/documents/pdfs/26459.pdf.
• http://www.talkingthermostats.com/telephone.shtml
• http://www.talkingthermostats.com/
• http://www.smarthome.com/300601.html
• http://yourhome.honeywell.com/Consumer/Cultures/en-US/Products/
  Temperature+Zoning/
• http://www.enablemart.com/Catalog/Household/
  KELVIN-Voice-Interactive-Thermostat
• http://www.talkingthermostat.com/