https://windowfilmforturf.com/
Thanks to a friendly poster - this product says it will prevent windows from killing grass and melting artificial turf by blocking the sun reflected from the windows.
I have no way of verifying that the product will solve the problem caused by your neighbor's house.
But you should know that he is basically wrong about the glass. The high reflectivity of the modern glass is NOT sufficient to generate the heat problem. If it is FLAT it reflects exactly as much heat as it receives - and in MOST cases less. Think about it - how could it generate MORE heat?
The only way it generates more heat than the sunshine which falls on it is if it has become a magnifying glass - it is NOT FLAT. NOT FLAT glass is the problem. We replaced the NOT FLAT glass on 26 of our homes with FLAT GLASS and we have not had a problem in over 10 years. The windows companies also say that the glass collapses over time. There is NO evidence that this is the problem. The glass is made with the problem.
Good luck with all of that.
Carl Scheider
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We are all in this together - and I'm pulling for you.
All means ALL - humankind and the planet.
Stay Safe.