Some of the Best Gas Furnaces You Can Buy in Naples Our Dave Lennox Signature® Collection gas furnaces are some of the best you can find. They also have some of the quietest heating around and offer efficient heating for your Collier County area home. These Dave Lennox Signature Collection gas furnaces boast variable speed motors, which help produce more comfort than traditional single speed furnaces. Variable speed furnaces’ blower fans start up slowly and only operate at full speed when there’s an extreme demand for heat. These furnaces can save your family a substantial amount on your energy bills. Learn about each of our Dave Lennox Signature Collection furnaces and features here. When you’re ready to move forward with your gas furnace replacement, give Speedy Air Conditioning in Naples a call at 239-244-3439 or schedule your appointment online. Need help with a gas furnace repair or want to schedule a gas furnace maintenance visit? We’ve got you covered. Our staff in Naples is trained, experienced and eager to help. Make an appointment or call 239-244-3439 now. * Annual Fuel Utilization Efficiency (AFUE) measures how efficient the appliance is in converting its fuel’s energy into heat over the course of a year.