Grizzly was sure up to the challenge trying to install a central heating and air conditioning system in my old farm house. As if that wasn’t enough I also had a 2 1/2 foot false celling. I wasn’t sure it was even possible! They said it was and did an excellent job of it. Nothing came through the false celling except the vents. They were all very patient and knowable while answering my questions. I would recommend them to everyone.