Cheapest thing you can do is install some of this.
Have ordered some of this. The specs look great, 38% reduction in the increase of heat due to sun, total rejection of UV, 70% of visible light still gets through (even for a single pane of glass that is only 86%, so this is "visible but minor reduction in light" which is great as it will prevent glare).
Have ordered some of this. The specs look great, 38% reduction in the increase of heat due to sun, total rejection of UV, 70% of visible light still gets through (even for a single pane of glass that is only 86%, so this is "visible but minor reduction in light" which is great as it will prevent glare).