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Furnaces Key Product Criteria | Products | ENERGY STAR Gas Furnaces Key Product Criteria Rating of 90% AFUE or greater for U.S. South gas furnaces Rating of 95% AFUE or greater for U.S. North gas furnaces Oil Furnaces Key Product Criteria Rating of 85% AFUE or greater Gas and Oil Furnaces Key Product Criteria Furnaces must be equipped with a high ... HVAC Contractor in Astoria OR and WA | Heating & Air ... We offer heating and air conditioning systems that are energy-efficient, reliable, quiet and environmentally sound. If you have a problem with your Carrier equipment, we'll either fix the problem or remove the equipment and refund your purchase price within one year of . Nathan Perry Heating & Air Conditioning Medford, OR ... Nathan Perry Heating & Air Conditioning provides residents, businesses and new construction projects in the Medford, OR area with a complete range of heating, air conditioning and ventilation services.    Read More