My mom had this same problem in her Sienna. The vent that is located right by the garage door, right above the Coat Closet is sooooo LOUD! Like not a little loud, but real loud! It sounds like a big industrial fan blowing! I told my PM the first day we moved in and he told me it's because it's energy star and it's suppose to sound like that. YEAH RIGHT LOL!! I don't think so! I'm sorry but I've lived in bigger homes and smaller homes and I've never heard a vent be this loud!
So before you close, make sure you stay in your house long enough during your walk through to notice if your Vent by the garage sounds like a big high powered fan and if it does make them fix it right away. It has 2 levels of noise, one being worse the then other. The first level it's not as loud but still annoying, then when it really kicks on, oh boy, get your ear plugs (shaking my head).
Now I guess I'm expected to wait until my 30 days if I want to complain again....I think NOT! I'm confident that my second complaint won't be handled the same way and that they have the HVAC people look into it. It's just really annoying, you can hear it all the way in the Kitchen and Family room. A few other people who have Romes already told me it's not normal. So I think I will be calling them this coming week to come check it out again. I seriously hope they can found out what the problem is and quiet it down.