Which aspect of ductwork might contribute to significant installation costs?

Size and layout of ductwork significantly contribute to installation costs due to the complexity and extent of the system required to efficiently distribute air throughout a space. Larger and more intricately designed duct systems may necessitate more materials, additional labor hours, and advanced installation techniques, which can all drive up costs. For instance, a system that requires extensive bends, turns, or customized sections to navigate around existing structures will not only take longer to install but may also require specialized labor or equipment.

While the material used can influence cost—certain materials might be more expensive than others—it's often the case that the size and layout dictate the quantity and types of materials needed. Air filtration capabilities and energy efficiency are also vital considerations, but they typically do not impact installation costs as directly as the physical configuration of the ductwork does. Thus, the size and layout of the duct system represent a critical factor in determining overall installation expenses in a heating, ventilation, and air conditioning (HVAC) project.