Your furnace or boiler is a large energy user. Consider:
– If health permits, keeping your thermostat at 20°C or below
– Lowering your thermostat at night and when no one’s home
– Checking the furnace filter once a month during the heating season (change or clean when dirty)
– Having a professional tune-up of your heating system at least every other year
– Replacing your older furnace with a higher efficiency model