Most people will at least need to know a general area of the residence to know which products are available and what climate you are in. Also the type of window may be helpful such as double hung vs casement as one brand may be better in a certain area. Other than that, I will leave it to the experts to respond but that info should hopefully help a lot.

I live in Austin Tx. I'm interested in Vinyl Double hung Windows and I will need some sliders as well. The windows throughout get almost no direct sunlight which is why I thought triple pane was a bit much.They are all odd sizes too. 6'x6' ,24"x60"(these are picture windows w narrow sliders on the bottom 2') and, 42"x60" slider

Address the homes insulation levels and air sealing first. There is almost no payback for window replacement in that climate. There is huge payback for proper insulation.

Most likely, l'll go w Lowes

Do not, whatever you do, get your windows from a big box store like Lowes or HD. This will be a mistake. If you want financing, get a Heloc, or wait and save money for the windows, or do what I did and replace a few windows at a time, the worst ones first or the most used rooms first. Mark my words - don't get your windows through a big box store. You've been warned.

Have your energy company come out and test your walls and windows to see where your home is leaching in cold air. Single pane windows can certainly be a large factor, and are probably pretty drafty if they are original, but may not be the primary source of your problem. The “no direct sunlight” is certainly not doing you any favors.

I would think double pane would be plenty for your area, but will let the experts chime in. Like frieda mentioned, your chances of being happy about anything with your big box store will be slim. Look elsewhere for reviews of other contractors and installers in your area. You’ll get better windows, and they’ll be installed by a pro, not a minimum wage big box employee. And dont buy pella. Sunrise, Softlite, Okna/Himark, & Polaris are your top performers, but may not have a dealer available in your area. Understand window nfrc ratings are and understand the needs for your climate. The more informed you are, the better decisions you can make.

The house is a single story and they blew in insulation into the attic before I moved in. The house has limestone on much of the exterior and its those rooms backed up to the stone that are coldest. I know the stone hangs onto the cold but I suspect there is a lack of proper insulation,as those walls feel very cold as well. I have no doubt that the windows are an issue as you can feel the cold on the floor and as you stand directly in front of them.Perhaps the idea of doing a few at a time is best.

Don Young windows should be in your area reach out to them for a dealer. There is very reputable installer in Tx, whi is a frequent poster, but his name escapes me at the moment. I am sure one of the other pros will be along to give you his company name.

Ultra Windows is his company name, just found it.