You prepared to rip off interior trim?

https://www.youtube.com/watch?v=O58RBz2_OBU

The storms would have to go unless you went with sash kits with jamb liners Or had your windows modified to run on them. There are other ways if you really want to keep the windows. The weight pockets could be filled with dense pack cellulose, low expansion window foam or cut rigid insulation to fit and seal perimeter with foam.

Thanks, toddinmn for the helpful comment. The reason I was trying to keep the storm windows is because they are relatively new and i am afraid of how much extra work will come about by removing them. Trying to avoid having to do exterior trim / aluminum which the storm takes care of and looks well.

How efficient are the sash kits, relatively speaking?

Thanks again,

Brent

They create a similar assembly performance as would a single pane and a well sealed storm. They are usually not for the DIY'er based on complexity of getting them installed right.

This would allow me to property [sic] insulate those canals and i think it would make a huge difference for the home.

A huge difference in regards to what—comfort? lower utility bills?

Please post pictures of the existing windows, from both inside and outside, as well as the options you’re considering.

A sash kit with Dual pane and low-E would have similar performance to a triple pane unit. The STC rating would be better and much less loss of glass over an insert.

Installation can be simple to comlex depending on who is installing and the condition of the existing opening . I rarely see them installed correctly by pros unless they are somewhat specialized in these, the ones they got right were because the openings and window needed no modification.

Thanks, Todd - you’re the man! Extremely helpful! I am going to look into the sash kits more!

Best,

Brent

You make have to use a window that is not cladded on the exterior side. Most use a cladding that can not be cut . It is very common (for me) to have to cut the window sashes to fit height.

That is not a recommended practice @Rachel Gregory. That space between the storm and vinyl window can become very warm and distort the vinyl. Any issues that could be deemed related to this type of installation (warping, bowing, melting, glass seal failure, etc) would not be covered under the manufacturer warranty.

You will get heat build up between the new vinyl and the storm and you will get warped windows. DO NOT DO IT !

Hire a window company.