We replaced our front window and patio door with Pella products, they seemed to be OK. So, we decided to replace the rest of our windows with Pella. Shortly after the installation, we found our bedroom window to be defective, which caused water damage. The installation crew took out the window and tore up the wall and carpet to repair the damage. After a Winter here in MN I noticed a moldy discoloration in the corners or wood casement of the windows. We called our sales rep and he came out to take a look and did nothing about it, he blamed it on humidity. The windows all over the house continued to get worse, so we called again. Pella and the installation company came out again. They were debating whether it was a window or installation problem. Meanwhile, it has gotten cold again and I have frost all around my new windows! I don’t see this happening with my friend’s and family’s windows! So frustrated! They are under warranty and nothing is being done!