As heat rises, so will your energy costs. For every degree above 20°C (68°F) your heating costs will rise about 5%.
If you're comfortable at cooler temperatures (especially if you're cooking or working around the house), turn down your thermostat and you'll be able to save.
Our quick home temperature reference guide:
Reading, or watching TV? Set your thermostat at 21ºC (70°F).
Working around the house? You may be comfortable at 20ºC (68°F).
Going to sleep? Set your thermostat for 16ºC (61°F) as you turn in for the night.