Perform regular maintenance on your oil furnace:
Regular oil furnace maintenance can save up to 5% per year on your heating bills. This is in accordance with the B139 oil burning code in Ontario.
Consider upgrading your furnace if it is 10 years or older to a high-efficiency, "Energy Star" rated oil furnace:
Modern oil furnaces can achieve efficency of up to 85%
Reduce the size of your nozzle:
By de-rating your oil furnace or boiler with a smaller fuel nozzle, and adjusting the air / fuel mixture, you can save up to 15% annually.