2009 Toyota Camry Heat/Air Conditioning

I recently had the "melting dash" replaced. After I picked it up, I noticed there is 'wind' noise and air, either hot or cold depending on the thermostat setting" coming from the vents even though everything is turned off. I was told there was a vaccum problem. But the people who replaced the dash say this is normal when the controls are set for outside air. This has never happened before, that air came from the vents when everything was off and there was the 'wind' noise. Could there be a problem?