When installing ductwork in a crawlspace, what must be done to prevent heat loss?

Insulating the ductwork is crucial when installing it in a crawlspace to minimize heat loss. Ductwork often runs through unconditioned spaces, like crawlspaces, where temperatures can vary significantly from the living areas of a home. If the ductwork is not insulated, the temperature of the air traveling through the ducts can be affected by the surrounding environment, leading to heat loss during colder months and heat gain in warmer months.

Insulation acts as a barrier that reduces the transfer of heat, helping to maintain the air at the desired temperature until it reaches its destination, such as a room in the house. Proper insulation can also enhance the system's efficiency, leading to energy savings and improved comfort in the conditioned spaces. By keeping the air temperature stable within the ducts, insulation not only preserves energy usage but also ensures that HVAC systems operate effectively.

While options like increasing air pressure or sealing joints can contribute to system performance, they do not address the fundamental issue of heat loss in unconditioned areas as effectively as insulation does.