Why is double-glazing being promoted hard for retrofitting window insulation, but we don't hear so much about thermal curtains and pelmets?
https://www.appropedia.org/How_to_make_awesome_thermal_curtains
Why is double-glazing being promoted hard for retrofitting window insulation, but we don't hear so much about thermal curtains and pelmets?
https://www.appropedia.org/How_to_make_awesome_thermal_curtains