Climate Control and Engineered Floors

I'm trying to manage my expectations here. The plan is to install an engineered floor on a concrete slab. It may be glued and floated or we may use click lock floating. Unfortunately, we don't have consistent climate control in that room. In the winter, if the wood stove is going, relative humidity can drop to 20%. If it's not on, the temp can drop to 45ish. In the summer, RH could reach 80%+, with temps even higher. This is our reality. Given this, how should I expect a good quality engineered floor to perform? Should I prepare myself for some winter gapping? Will floating prevent buckling in the summer? Thanks.

 

Wood is going to do what wood does.

@ 20%rH, expect some face cracking, not gaps between the boards, so much. @80%rH, expect mold to grow.

 

Thanks.

I believe I can manage the extreme conditions so that they don't last more than a day or so and hopefully, that will mitigate the impact.

 

It's best if temperature and humidity are maintained at the same levels year round. Temperature at approximately 70 degrees and humidity between 35-55%.