Lennox furnaces can be purchased directly from the Lennox website, or through websites such as eBay and Amazon. The Lennox website offers 10 different models of gas furnaces and three models of oil furnaces, as of 2015.
The gas furnaces sold on the Lennox website have an efficiency rating that ranges from 98.2 for the Dave Lennox Signature Collection SLP98V variable-capacity gas furnace, to 80 for the Elite Series EL180E gas furnace. The oil furnaces range in efficiency from 83 for the Elite Series ELO183 oil furnace, to 85 for the Dave Lennox Signature Collection SLO185V oil furnace. Prices are not provided for the furnaces on the Lennox website because of the factors that go into the estimate for the heating system. The website does provide customers with a Lennox dealer search feature, so customers can have a certified, local dealer perform an inspection and provide a personalized estimate on how much a Lennox furnace costs.
Lennox furnaces can be found on eBay that range in price from $450 for a Lennox gas furnace model G40UH-24A-045-15, to $1,249 for a New Ducane by Lennox, a 95% variable speed, two stage high efficiency gas furnace. The shipping options are dependent on seller preferences. Amazon also has a listing for a Lennox oil furnace, with an efficiency rating of 80, which costs $1,146 plus $940 for shipping.