Originally Posted by KarTek

I dug down in to the detailed description and found this:

"• Supplemental heat pump provides an additional heat source to your main heat source when outdoor temperatures are above 45°F"

To answer your #4, the large AC unit in my shop just has a slide out handle. Once you remove the front cover, the handle is on the bottom of the insert. On mine, nothing but the weight is holding it in but takes a pretty strong pull to get it moving.