How do you know when your furnace is going out?

Related questions

1. How much does it cost for a new furnace?
2. How long do HVAC units last?
3. How much does it cost to install ductwork in an old house?
4. How much does a central AC unit cost?
5. What is the right size AC unit for my house?
6. Does central air increase home value?
7. What size furnace do I need for a 2000 square foot home?
8. How much does it cost to install HVAC in an old house?
9. Is a 14 SEER AC good?
10. Is 13 SEER AC good?

Tags

1. #furnace
2. #these
3. #headaches
4. #feeling
5. #house
6. #symptoms
7. #signs
8. #nausea
9. #immediately
10. #frequent
11. #window
12. #technician
13. #experience
14. #disorientation
15. #service
16. #burning