When will we know whether the Non-Business Energy Property Tax Credit applies for 2018? Installed new windows in 2018; TurboTax says it doesn't know if a credit is due.

[Opus 17]

That credit expired December 31, 2017 and has not been renewed.  It is part of a package of tax breaks called "Extenders" that is sometimes passed by Congress late in the tax season or even the next year.  It's probably in the program in case Congress passes it again, but as of today it is not allowed.  (Part 2 of the official form 5695 is blank.)

You would have to watch the news to see if a bill containing the tax extenders is ever introduced in Congress, it would have to be passed by both houses and signed by the president.