When I moved into my new apartment building two years ago, I purchased a portable AC unit. Different brand. But it couldn’t keep up with the extreme hot days. I couldn’t even keep my bathroom door open. With this one the floors even feel cool to walk around on. Significant difference. This one actually powers down into a standby mode when it reaches the ideal temperature. My other one ran continuously. It was easy to assemble the guided side pieces and fit into the window perfectly. It was shipped quickly and arrived quickly. My only concern was the FedEx Ground delivery. I live in a very small old building and it was just left in the entrance to the building blocking the front door, the mailboxes and the door to the basement where a business operates. I receive no call to schedule the delivery and they didn’t call or buzz when they got to the building today.