There are 4 different types of furnaces, as per their fuel type. They are: Oil Natural gas Propane Electric Despite the fact that all 4 have their own advantages and strong points, The people in Toronto prefer electric and natural gas furnaces considering the cold weather. Natural Gas Furnaces Natural gas furnaces will blow your mind since they’re immensely economical.  As per the AFUE (Annual Fuel Utilization Efficiency) number of natural gas furnaces, they are basically the best in terms of energy efficiency, commonly registering from 90 to 98% efficiency. Of course, this hinges on the model. In addition, up against other fuels, gas is affordable, hence the popularity of natural gas furnaces in many Toronto homes. Electric Furnaces Electric furnaces are smaller and rank among the most affordable, meaning they are the best bet for smaller houses or homeowners with a limited energy budget. Compared to other furnaces, electric ones function differently since they don’t utilize burners. Rather, they use electrical ignition for heating conductive coils. You’ll find many electric burners in regions with no installed natural gas pipes, particularly in rural areas. Oil Furnaces Similar to natural gas furnaces, oil furnaces combust fuel (oil) to warm your house. Oil furnaces don’t cost as much as their natural gas counterparts although their efficiency is lower. Oil furnaces have an average AFUE number of 80 – 90% compared to natural gas furnace’ 90 – 98%. Oil furnaces are usually found in cold climates, and are all the rage in northern Canada. Propane Furnaces In case the other kinds of furnaces are not suitable for your residence, propane furnaces can come in handy. They function more or less like oil and natural gas furnaces. Considering the easy way you can store propane, propane furnaces are excellent for homeowners with no access to natural gas and oil lines.