What does a lower K factor indicate?

A lower K factor indicates better insulation properties because the K factor, or thermal conductivity, is a measure of a material's ability to conduct heat. When the K factor is low, it means that the material is more resistant to heat flow, thereby providing enhanced insulation. This characteristic is essential in various applications, including building insulation, as it helps maintain temperature by reducing heat loss in cooler environments or heat gain in warmer ones. Thus, materials with a lower K factor are generally preferred for insulation purposes.