The R-value of an insulation material measures its thermal resistance, or ability to resist heat flow. A higher R-value indicates better thermal insulation performance. In an HVAC system, a higher R-value insulation material can reduce heat transfer, resulting in improved energy efficiency and cost savings. However, the R-value of an insulation material can be affected by factors such as temperature, moisture, and compression, so it’s essential to consider these factors when selecting an insulation material.