FAQs
Here are answers to common questions on home furnaces to make sure they operate efficiently.
How Long Does a Furnace Last?
Gas furnaces typically last 15 to 20 years with proper maintenance, while electric furnaces can last 20 to 30 years. The lifespan depends on factors like regular maintenance, proper sizing, installation quality and usage patterns. If you keep up with annual maintenance and regular filter changes, you can extend your furnace's life significantly. Poor maintenance can reduce lifespan to just 10 years, while well-maintained systems sometimes exceed 30 years.
Why Is My Furnace Leaking Water?
Furnace water leaks commonly occur in high-efficiency models because of condensation issues with clogged drain lines, damaged condensate pumps or cracked heat exchanges. The water travels through condensate drain hoses and pumps, and blockages in any component can cause backup and leaks. To fix this, turn off your furnace immediately, clean up the water to prevent damage and call a HVAC professional for diagnosis and repair.
How Often Do You Have To Change a Furnace Filter?
As a general habit, you should check your furnace filter monthly and replace it when it's visibly dirty. If you have standard one to two-inch filters, you should change them every 60 to 90 days. Thicker filters last longer, with 2-inch filters needing replacement every 6 months and 4-inch filters can last 9 to 12 months. If you have pets, allergies or multiple occupants in your home, you should change your furnace filter more frequently, typically every 30 to 60 days.
Why Is My Furnace Blowing Cold Air?
A common reason for cold air from your furnace is incorrect thermostat settings, such as the fan being set to “ON” instead of “AUTO” or the temperature being set too low. Dirty air filters can cause overheating and trigger safety switches that shut off burners while blowers continue running, which makes your furnace blow cold air. Other causes include pilot light issues, faulty flame sensors, game supply problems or ignition system malfunctions requiring professional diagnosis.