The advantage of an All Air HVAC System is: It has a higher ...

[jjjetplane]

The advantage of an All Air HVAC System is:
 
   It has a higher initial installation cost but is
  cheaper to operate
   It requires massive ductwork which limits ceiling
  heights
   It is easily zoned for thermal comfort in open
  plan spaces
   All of the above

Question 2

Thermostats should be located:
 
   Away from exterior walls
   Away from heat producing sources
   48 inches above finished floor
 
   All of the above

[dajones82]

Answer to Question 1

It is easily zoned for thermal comfort in
open plan spaces

Answer to Question 2

All of the above