> Keep your furnace clean, and properly adjusted with annual maintenance. If your furnace is working at peak efficiency it will use less energy and cost less to operate.
> Clean or replace the filter every 1 - 2 months, or as needed. A dirty filter reduces the air flow, overheating you furnace and componants, and forces the furnace to run longer to heat your home.
> Change your thermostat batteries at least once per year. Consider doing it on your birthday so you don't forget!
> Lower your thermostat by 4-5 degrees Celsius (7-9 degrees Fahrenheit) while you're sleeping at night and when no one is at home.
> The modern high efficient furnace is very unforgiving when installed incorrectly. It may not groan and complain right away, but it will eventually cause problems - the kind you don’t want late on a Friday night.