We finally received installation instructions to install the 3 season patio door after many phone calls I called Heartland and spoke to a Mike, I believe he is in service. He didn't have any instructions but was able to try to tell me how to install lit, but referred me to Lippert. I called them and was told they couldn't send them to me because they only distribute to commercial to the public but if Heartland was to request them they would send them there. Back on the phone to Mike at Heartland. I told him what I was told so he emailed them the request then emailed the instructions to me. Mike was extremely helpful.