In January, I had A/C system replaced in my 2,000 S.F. south Florida home. Went from 3.5 ton/12 SEER to 4 ton/16 SEER, Trane 4TTR5049E & 4TEE3C09A.When a Bdrm. door is almost closed & system comes on, door will shut quickly. With the variable speed AHU, should I be able to tell (or hear) a difference in fan speed at any time (which I can't) ? And, at end of May, should I be realizing more than a 8% energy savings ? Thank you in advance for your help !