What type of insulation is ideal for ductwork in a heat pump system?

Ductwork in a heat pump system benefits significantly from insulation that effectively minimizes heat loss or gain as air travels through the ducts. Rigid foam and fiberglass insulation are ideal choices because they provide a good balance of thermal resistance and moisture control.

Rigid foam insulation is particularly effective due to its high R-value per inch, making it efficient at preventing thermal bridging, while also being vapor-resistant, which helps protect against condensation that might otherwise occur in duct systems. Fiberglass insulation, on the other hand, is widely used due to its flexibility and ease of installation, along with its effective thermal performance when applied correctly.

Both materials are also important for maintaining energy efficiency, as they reduce the amount of energy needed to heat or cool the air inside the ducts, leading to lower utility bills and improved system performance over time. In contrast, other insulation types like cellulose and mineral wool may not provide the same level of moisture resistance or thermal efficiency required for duct insulation in heat pump applications.