The installation of our Indows couldn't have been smoother or simpler. Our installer Walter took the time to explain how to insert and remove the Indow, giving both my wife and I a crack at it. The entire process took under an hour (for 9 Indows) and was perfectly timed the day before Thanksgiving in 2019. Since then I'm happy to report that our monthly electric bill is already down by 20%. Highly recommend both Indows and Super Green Solutions.