re: New Construction HVAC question

I am about to swap a 5 ton unit out for a new inverter unit / variable speed unit from Either Tempstar or Comfortmaker (Same Parent as Carrier).

The biggest piece of advice I can give is make sure the HVAC contractor right sizes the return air. Seems like every house has about 50% of what is really needed on the return air. This makes a huge difference in the house.