Does a 2 story house need 2 AC units?

Related questions

1. Is central air better than ductless?
2. How much is the Mitsubishi heating and cooling?
3. Can you use one AC 2 rooms?
4. How does a 2 zone HVAC system work?
5. What is a zoned HVAC system?
6. How much do ductless heating and cooling systems cost?
7. How much does it cost to Zone HVAC?
8. Can a window air conditioner cool an entire house?

Tags

1. #zones
2. #central
3. #single
4. #zoned
5. #house
6. #install
7. #conditioning
8. #system
9. #upstairs
10. #divided
11. #downstairs
12. #evenly
13. #advantages
14. #possible
15. #thermostats