A working furnace is important for keeping warm during Canada’s long, cold winters. But if your heating system starts to fail, waiting to call for service can cause an even bigger problem, and potentially more expensive repairs. That’s why you need to know about the significance of timely furnace repair in Ottawa for homeowners who want to ensure that they, their families and their homes stay comfortable, safe and efficient during the coldest months of the year. Furnace problems can start slowly — maybe a slight…