How do PU sandwich panels contribute to energy savings?

Sandwich panels play an important role in energy-efficient buildings because of their excellent thermal insulation properties, reduction of thermal bridging effects, lightweight and high strength, and rapid construction sustainability. By using sandwich panels, buildings' energy efficiency can be improved, energy consumption can be reduced, and a more comfortable and sustainable indoor environment can be created.

Here's an article that answers the reasons in detail

How do sandwich panel systems contribute to energy savings？