What has worked the best for us is shading any window that gets sun on it. We use the awnings on those we can and snap-on sun shades on the rest.
Sun shades must be on the outside as Reflectix on the inside is all but useless as the glass and frames get too hot to touch unless covered entirely on the outside. There is a company around Quartzite that will come to you, measure, make and install them.
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