This project concerns two sets (4 windows to a set adjacent to each other) of ’70s Andersen wood casements.  The windows face West and recent tree removals at a neighboring property has resulted in  afternoon sun pouring in, causing temps to rise into the 80s and HVAC can’t keep pace.  The windows themselves are in very good shape, no rot and look okay for being close to 50 years old.  

The simplest option would be to replace each bank with new windows.  The contractor I’ve been in discussion with claims I need to install new construction windows.  I’m loathe to go this route as we just had the house resided with Hardie Plank and Boral trim in 2018 – I’m not keen on the potential for them to damage the siding.  Also I’m at a loss for why they can’t just use replacement windows, any ideas?

Andersen still sells replacement sashes for these windows but they’re just standard double-pane glass, not low-E.  Is it possible to get custom sashes made with low-E glass or is it cost prohibitive?

The last alternative I could think of is having a professional install some sort of film to cut down on the heat gain or maybe even buying new sashes then having the film applied.   

I’d love to hear ideas/thoughts?  Thanks