Lennox Industries Inc., P.O. Box 799900, Dallas, TX 75379-9900; (800) 9-LENNOX; www.lennox.com.
The G61V furnace is the latest addition to the manufacturer's Signature Collection. The model is Energy Star rated, which certifies that the product reduces energy use by at least 20 percent to 40 percent, company officials said. The furnace also runs at a low speed up to 80 percent of the time and provides two levels of heat output. Variable-speed operation helps to control high humidity, while the continuous fan mode compliments indoor air quality products such as filters.