Wrightwood is alpine, not desert, and cabin-style homes here typically have minimal ductwork compared to HD valley cities. Many Wrightwood homes use propane wall furnaces, wood stoves, or radiant systems instead of central forced-air, which means no central ducts at all. When central ductwork exists, it usually serves single-floor floor plans (most Wrightwood cabins are single-story) with shorter run lengths than valley custom homes. Replacement work is rare here because the duct infrastructure is smaller and newer (most Wrightwood central HVAC installs are post-2000). The bigger Wrightwood ductwork conversation is duct extension when adding central HVAC to a home that previously only had wall furnaces, or duct sealing when an existing central system is losing efficiency. Alpine climate considerations affect duct insulation requirements: Wrightwood winter attic temperatures can drop below freezing, which makes duct insulation matter for heat retention but does not require the heat-rejection insulation needed in 140°F+ HD valley attics.