When it came time to upgrade a 10-year-old oil furnace with a cracked heat exchanger, Dr. Energy Saver and the homeowner opted for installing a replacement oil furnace that operates at 87% efficiency - the highest efficiency rate available from an oil furnace. Although propane heating systems are more energy efficient (up to 96% efficiency) than oil furnaces, it was best to install a cost-effective High Efficiency Oil Furnace for this home, as there would be a higher cost involved in converting the existing system to propane. Dr. EnergySaver's commitment to responsible energy conservation practices guarantees that we will always carefully evaluate each case, and only suggest the best energy efficient solutions to fit your budget and your home. Dr. Energy Saver offers free estimates on all heating replacements.