Compare the best high efficiency gas furnaces in Canada, including prices, installation costs, best furnacends, efficiency, and more. Get free quotes!.Lennox OEM Parts supplies available at compe.ive prices shipped to Home or Shop. so we can help you get the correct part for your system. Order with confidence from an Authorized Lennox Dealer..Note In Zones , the coldest zones, a system with an efficient gas furnace and small central air conditioner is also a good option Lennox is one of the premiumnds with higher initial cost..Our Lennox gas furnace price list gives you an opportunity to compares and prices with other topnds like Trane, Rheem, York, Maytag and more. You’ll.