The Comfortmaker PDX3 dual fuel unit from this company offers 13 SEER and 80 percent annual fuel utilization efficiency. According to the manufacturer, dual-fuel operation offers the ability to run on heat pump or furnace, whichever is most efficient and based on weather conditions. The heat pump features a new defrost system that helps keep coils ice-free for more efficient and reliable operation. The PDX3 models also use environmentally sound R-410A refrigerant. The condenser coils on these products have wire inlet grilles and use vinyl mesh installed on the surface of the coils for extra protection.

International Comfort Products, P.O. Box 128, Lewisburg, TN 37091; (931) 270-4222; www.comfortmaker.com.

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