Sounds like running water when I acelerate

It could also possibly be a sunroof drain clogged (if equipped) or another body drain. On the wet floor, is it antifreeze or water? If antifreeze, more than likely a heater core issue. If water, I would check the a/c as you have, and also body drains on the car. Certain makes and models are notorious for issues such as this, which can cause extensive water to be housed in the vehicle. Hope this helps. Here at DRT Inc we are always happy to provide information to our customers.