Filters should generally be replaced every month when the system is running. Replace filters with the same kind and size as original filter. If your filter is not disposable, follow the manufacturer instructions for cleaning.
During the heating season, set your thermostat at 68 degrees or less.
If you have a natural gas heating system, turning back the thermostat an additional five degrees when you plan to be away will save energy. If you plan on being away for several days, set the thermostat at 50-60 degrees.
Humidified air will make the air feel warmer during the heating season.
Home Maintenance Tips:
Filters should generally be replaced every month when the system is running this will reduce the risk of "icing up" your A/C unit.
During the cooling season, keep the window coverings closed during the day to prevent solar gain.
Set your thermostat as high as comfortably possible in the summer. The less difference between the indoor and outdoor temperatures, the lower your overall cooling bill will be.