Mecho Shades - Keep heat in in winter?

We are building a 4 seasons room. Contractor recommended Mechoshades - I know they protect from sun and heat in summer, but do they keep the heat in during the winter?

Since they aren't selective transmission films which could be arranged to keep heat out in summer and still lose heat in winter, If they keep heat OUT in summer, they should keep IN in winter. Steve
polkataco (author)  steveastrouk8 years ago
Mecho shades are made of various fabrics that keep the heat out by keeping the sun out. But does the fabric have any insulating characteristics to keep the heat in during cold winter nights?
lemonie8 years ago
The contractor should know this. Ask them why they recommend these.