Lennox

Lennox furnaces are made by a long-established firm founded by Dave Lennox in 1895. It has been in business since then, providing central heating, ventilation, refrigeration, and air conditioning to customers all around the world. The company specializes in high-efficiency cooling and heating systems and produces some of the most energy-efficient products on the market today.

With a 99 percent AFUE rating, Lennox's Signature Collection SLP99V variable-capacity gas furnace is one of the most efficient products on the market. There are other Energy Star-certified two-stage gas furnaces from Lennox, some with built-in Power Saver technology, that have energy ratings exceeding 96 percent. Lennox offers a total of 23 models, each with its own set of benefits, such as dependability and cost-effectiveness.

Best for: Most Efficient Furnaces

Price range (purchase & installation): $2,300 - $3,800

Warranty: Parts - 5 years; heat exchanger - lifetime

Website: https://www.lennox.com/products/heating-cooling/furnaces