Finally decided to go with Carrier and had the Infinity 4 ton unit installed last month (has variable speed blower and 2 stage condenser). Question is this: should the air blow hard from the vents? The house stays cool at 73 (1830 sq ft in Houston, TX), but there is not a lot of air movement felt near the vents. The plenum leads to trunk-line style runs with flex duct going to the vents. I recently visited 2 new houses (1 larger, 1 smaller); both kept their settings higher (around 75 and 77, respectively) and you could feel air blowing up to 10 feet away from the vents. Which is "normal"? Which is more efficient?