One of the most obvious signs that your furnace may be past its useful life is excessive cycling, meaning that your furnace turns on and off much more frequently than typical. You will hear it turning on and off and yet you won’t notice much change in the air temperature.
Another common sign of an aging furnace is that it will take much longer for the temperature in the house to rise to the level you have set on your thermostat.
A potentially more dangerous sign would be unusual, loud noises (such as metallic banging) coming from the unit or any traces of a burning smell in the air being delivered from your furnace. If you detect these signs, immediately turn the heat off and contact us to have your furnace inspected. You might be in need of furnace repair or replacement as the failure of certain parts can lead to dangerous conditions.