1. Your heating system is making strange noises, such as banging, clanging, or whistling.
2. Your heating system is not producing enough heat or is blowing cold air.
3. Your energy bills have significantly increased without any change in usage.
4. There is noticeable dust or debris coming from your vents when the heat is on.
5. Your thermostat is not working properly or is displaying incorrect temperatures.
6. Your heating system is cycling on and off frequently.
7. There are foul odors coming from your vents when the heat is on.
8. Your heating system is older than 10-15 years and has not been properly maintained.
9. Your pilot light is frequently going out or is a different color than normal.
10. Your heating system is leaking water or other fluids.