

Using a reflective surface such as aluminum foil on the windows (shiny facing outside) will help. I’ve used contact spray adhesive on cardboard cut to size of window before. You can also get the bubble-wrap aluminum insulation.
Cut temps in my old studio from food-safe poultry temp to near ambient on the 100+F/40+C days.
1,3,5,16,18,20
Depends on mood and temperature.