How long do HVAC systems last?

Related questions

1. How much does HVAC cost for new construction?
2. What is the most efficient furnace?
3. How much will it cost me to replace my furnace and air conditioner?
4. How much is a commercial HVAC system?
5. What is the best rated furnace and air conditioner?
6. How many square feet does a 2 ton AC cool?
7. What is the minimum SEER rating for new systems?
8. What does a new HVAC system cost?
9. How much does a rooftop AC unit cost?
10. How efficient is a 20 year old furnace?

Tags

1. #furnaces
2. #heating
3. #pumps
4. #average
5. #units
6. #regular
7. #order
8. #components
9. #require
10. #scenarios
11. #systems
12. #conditioning
13. #maintenance
14. #ventilation
15. #proper
16. #years
17. #efficiently