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Personally I'd give them your recommendation against doing it in those temps.
If they want to proceed they should provide to you in writing that you will not be responsible if it loosens with warm temps. You're going to have to provide photos to get paid....if it is stretched well when done it will show in the photos. They can't come back later and say it was installed sloppy to begin with.
If it needs re-stretched then charge for it.
I mean you can only give the customer your expert opinion. You can't be responsible for what happens when they ignore it.