A:AnswerMake sure nothing is coming in contact with the fan in the back of the unit, near the bottom. Mine had a little denting in the area of the fan and its possible that the back fan cover could be interfering with the fan blade. Or maybe a critter or some debris is just caught in there. Good luck.
A:AnswerAll you have to do is plug it into a 120voltac outlet and set the temperature dial to recommend. If you mean by installed placing it where you want it or unpacking it, that is up to the delivery service. I brought mine home in a minivan.