material for outdoor window covers

harold1946 wrote:

dan-nickie wrote:

harold1946 wrote:


Anything on the inside will keep the sun out but will not stop the heat transfer in the summer. The only way to stop it from penetrating must be done on the outside.
Why would anyone think that something placed on the inside would prevent heat transfer from the outside :S

We think that because many of us do use reflectix on the inside and it does work to keep out heat. Maybe not quite as well as something on the outside, but it works very well.

All those windshield shades for cars are on the inside also, and they sure keep the inside from heating up so much.

Put it on the outside and feel the difference. Once the heat has transfered through the glass its in. About all those interior shades do is protect the dash from UV.
Put your hand behind the reflectix and feel the heat that is comming through. Once its in, its in.
Just because they sell it and many use it does not mean it is the best.

Didn't say it was the best.
It makes a very dramatic difference.
I owned a solar shade business for 10 years.
We measured a lot of temperatures in that time gauging effectiveness.
I understand that blocking the sun before it hits the glass is optimal.
We also sold rollup solar shades for the inside where it was not practical to put them outside (a restaurant for example).
It has already been discussed that the reflectix does not hold up on the outside.

I also have snap on solar shades for the outside of the widows that we use if we are parked for a while that allows outward visibility.

I would like to ask if YOU have ever tried reflectix on the inside when it's real hot outside?