The Most Efficient and Quietest Oil Furnaces Available: Dave Lennox Signature® Collection You need an energy efficient furnace, which is why our Dave Lennox Signature Collection oil furnaces were built with variable speed motors. These motors vary their speed in relation to the amount of heat needed so you can reduce the amount of energy used and decrease operating sounds. Speaking of operating sounds, SilentComfort™ technology is another key feature in this equipment, enabling your home to stay warm, cozy and quiet – unlike some typical heating systems. Find out more about the Dave Lennox Signature Collection oil furnaces we sell at Comfort Zone Inc in Cape Coral below. To determine which system will work best for your family, call us at 239-574-2327 or schedule an appointment online. Are you searching for a profession to assist with your oil furnace maintenance and repair needs? Comfort Zone Inc in Cape Coral has you covered. Just give us a call at 239-574-2327 or use our online scheduler to book an appointment. * 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.