The Most Efficient and Quietest Oil Furnaces Available: Dave Lennox Signature® Collection Dave Lennox Signature Collection oil furnaces are defined by their quiet and efficient operation. These features stand out thanks to the units’ variable speed motors, which run at different speeds to better control air flow, limit sound levels and lower energy costs. In addition, the sound – or lack thereof – on these oil furnaces is outstanding. SilentComfort™ technology enables heat to be produced and distributed without the loud noises characteristic of standard systems. You can discover more about each Dave Lennox Signature® Collection model below or call Nisair Air Conditioning in Stuart to speak with a staff member about the best heating equipment for your home. Call us at 772-318-4252 or make an appointment online today. Did you know our team also performs oil furnace repairs and maintenance in Stuart and the surrounding area? Call us at 772-318-4252 for more details or to set up a service visit. * 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.