I had Pella Impervias installed in my home: five double hung with contemporary vents, one slider. No grids in any of them. I really like the windows--the temperature in my house is a lot more uniform now and we can easily open and close the windows, which is a big step forward. ;) The installation crew did a nice job and made sure things were good and tight, so no complaints there.

I've got a modern ranch house and the brown color worked for us. I also liked the way the Impervias were simple ad clean looking, as opposed to some of the other windows I saw with more ornate trimming. That was a plus for me. You are correct about the corners though, they would look better if Pella used a different way to attach/fuse/form them.

Thanks for the input! I'm glad to know the installation went well. There seems to be quite a few complaints about that end of it.

That's right, the installation is the thing that really matters. Best windows in the world will be junk if they aren't installed right.

I've found that if you read these boards too much, you'll be too scared to do anything. What matters most is the install crew that will handle *your* job, not the one that handled someone elses in a different part of the country. The more information that you can get about those people and the work they've done, the better off you'll be. I downloaded all of the installation guides from pella.com and read them carefully, plus looked over the sample windows many times at the showroom to know what to expect. When the crew came to do the work, I kept an eye on what they were doing to make sure they didn't skip any steps and asked questions as they were working if I was confused about something. Truth is, the guys wanted to do a good job and keep the work assignments from Pella coming their way, so it wasn't a big deal. In my area, there are only two crews who install for the Pella store and lots of construction and renovation, so I'm sure they like having that Pella contract.

Those who commented and used Pella impervia what location are you? Midwest? Cold and hot seasons? We are considering them to replace some 30 year old Pella wood clad casements in it iowa home. I am torn between them and vinyl bc vinyl doesn’t look close to what we have and we won’t be replacing all at once and you have more frame/less window/view. But I am more concerned quality over time and low maintenance. Hopefully Pella will install well and resolve issues well.

"But I am more concerned quality over time and low maintenance."

Honestly keep looking then as the Impervia line and Pella in general is something everyone pro I am aware of won't touch.

Thanks. We are looking at another line too but actually around here Pella has a good name up again some others so kind of surprised.

Pella impervia has to be one of the biggest pieces of garbage i have ever seen. I think its flimsy and very cheaply made. no pro i know if would ever recommend it. Expand your search.

thats my opinion as well as others.

higher end vinyl will be much more air tight and energy efficient as well as very durable.

look into soft lite, okna, sunrise, or kensington. You will see the difference.