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Krigger, J.; Dorsi, C. (2004). Residential Energy: Cost Savings and Comfort for Existing Buildings. Helena, MT: Saturn Resource Management.
"Consumer Guide to Home Energy Savings." (2003). American Council for an Energy Efficient Economy. 8th Edition.
"Advanced Cold-Climate Heat Pump/Frostless Heat Pump." (PDF 147 KB). (2004). Emerging Technologies & Practices, American Council for an Energy Efficient Economy.
"Cold Climate Heat Pump Shows Promise, but Manufacturing Delayed." (1 April 2005). News release. Chelan County PUD.
"New Air Cooled Reverse Cycle Chiller Provides Cost Effective Heating at -15°F." (8 September 1997). Air Conditioning, Heating & Refrigeration News. pp. 22.
"Nyle Corp. Unveils New Cold Climate Heat Pump." (October 2001). Energy Design Update (21:10); pp. 9-10.