Spacious, rock solid, beautifully finished and thermally efficient.

Made to thrive in 20F or warmer conditions, this spacious bag is filled with durable and thermally efficient synthetic insulation.

Building construction techniques-improved insulation, reflective roofs, thermally efficient windows, etc.-change to reduce heating costs.

Copper has many desirable properties for thermally efficient and durable heat exchangers.

This ultra-lightweight mummy bag features thermally efficient 800-fill-power goose down, compressing into a tiny package for warm-weather backpacking.

It is 60% thermally efficient.

Injectors were therefore simple and reliable and also thermally efficient.

The plant is 44% thermally efficient.

When the power devices are attached to a proper heatsink, there is no need for a thermally efficient substrate.

"That makes the engine lighter and more thermally efficient," Spencer said.