they are double paned, and there are only 5 large window panels here -- so it stays warm, much to our surprise!

who is the manufactor for these windows? did you have to paint the interior black?

no paint - they are powder coated steel. hand made by Bill Curran

Love these windows! How much per panel?

@diven
We manufacture Renaissance solid bronze windows & doors with insulated glass offering excellent energy efficiency. You are welcome to download our product brochure http://werefindinganswers.com/renaissance/

@rittlesu
Most of our images are pictured with a natural rose bronze color, but we also offer a dark patina finish.

@kristinaphillips
If you are still looking for prices on steel & bronze windows & doors we look forward to hearing from you. They have narrow sightlines and no lock block allowing for a seamless look between active and fixed panels.

Here are some product images-
http://www.houzz.com/projects/152134/Renaissance-Solid-Bronze-Windows---Doors-by-Progressive-Solutions
You may also be interested in these bronze & steel ideabooks-
http://www.houzz.com/ideabooks/7715785/thumbs/Bronze--Copper---Steel-Door-Ideas
http://www.houzz.com/ideabooks/18543834/thumbs/Bronze--Copper--Steel---Warehouse-Window-Design-Ideas
http://www.houzz.com/ideabooks/20982708/thumbs/Bronze--Copper--Steel---Warehouse-Window-Wall-Ideas