What does AFUE stand for? Gas heating appliances are rated according to their Annual Fuel Utilization Efficiency. The higher the AFUE rating, the more efficient the unit. The minimum rating for Energy Star compliance is 90 AFUE. The highest efficiency furnaces will exceed 95 AFUE.
What is a SEER rating? Air conditioning equipment is rated by the Seasonal Energy Efficiency Rating, or SEER. The higher the SEER rating, the more efficient the unit. The minimum rating for Energy Star compliance is 14 SEER. The highest efficiency air conditioners can meet or exceed 20 SEER.
What does HSPF stand for? Heat pump equipment in the heating mode is rated by the Heating Seasonal Performance Factor, or HSPF. The higher the HSPF rating, the more efficient the unit. The minimum rating for Energy Star compliance is 8.2 HSPF. The highest efficiency heat pumps will meet or exceed 10 HSPF.
Should a thermostat be set to “auto” or “on”? If set to “auto”, the fan operates only when the temperature requires it. This is the most efficient setting. However, there are advantages to using the “on” setting. Air is constantly filtered through the unit’s filter, and the constantly circulating air results in a more even temperature throughout the house.
How often should I replace my filter? You should replace a standard 1” filter every month, even if it states it is a 3 month filter. If you have a larger 4-12” media filter we recommend replacing those at the beginning of each heating or cooling season.