Milgard Ultra fiberglass only has single hung, no double hung; I went to their Simi Valley factory/showroom. Their Tuscany line has double hung. I was impressed with how easy it was to pull it in to clean the outside of window as compared to the Pella vinyl I tested at a Pella showroom. I was impressed with Pella’s wood with aluminum clad exterior but everything else, vinyl and fiberglass, looked very low end. The finish on the Pella fiberglass had a wrinkly texture that looked cheap. I am concerned with comments about the Milgard Ultra fiberglass finish peeling. Has anyone else experienced this? We are planning on replacing all the windows and frames on our stucco house in SoCal so I want to get this right. We have white trim inside and out so color not an issue.

I'm a bit confused on your post. Have you already used the Marvin wood window.....or did you mean you've used their fiberglass product? I couldn't figure that part out. There are a couple manufacturers who manufacture a composite style window. I know Marvin, Pella, Milgard, Thermoview & A&H all have a fiberglass or composite window of some kind. I've personally installed the Pella & Marvin fiberglass windows and can say they're both great windows. I haven't installed the others so I can't offer any fair information on them. One thing you need to look for is a manufacturer that uses a non-corrosive gliding wheel under their sashes. A nylon wheel will have issues under a heavy sash. The brass or stainless rollers will offer you the best overall performance and operation of a heavy sashed window unit. The composite windows will be heavier than vinyl and most wood clad windows. The numerous layers of fiberglass, usually backed with some kind of steel support for strength, can get quite heavy. Getting a window with a good roller system will let you have a heavier window sash and glide easier. You'll just have to see if you can get some large sample windows to try before you buy. Good Luck in your search!!!

Toddinmn I’m not sure what you mean. I’m new at this. I live in Northern California in the valley. Our weather is from below zero (not too often) up to somewhere in the 100°’s. (Sometimes up to 115°’s, but not often). Presently, we have a cold house. We are trying to make changes to keep it warm. All suggestions are welcomed. We are thinking of Milgard’s fiberglass windows, aluminum glass doors (we like the slim frame look and possibly a fee vinyl windows in the garage ( to save a few dollars, but not sure if that a good idea). Thank you

Depending on the calculus, other improvements will more than make up that differential between the Fiberglass frames and the Aluminum. For 20K more, you could easily incorporate some solar. As a disclaimer, I am not familiar with Title 24 in any manner, thankfully.