If you want a proper job done try and find your closest Luxaflex dealer:
http://www.luxaflex.com/gb/en/findin...showroom/sb.cn They are not cheap but are without doubt the best for keeping heat in and out, You want the Duett ones not Plisse or any other type, Duette's are by far the best.

I used to be a Luxaflex dealer for 10 years but sold up to move down south.