Warm air ducts can have a heat loss as great as?

Warm air ducts can experience significant heat loss due to various factors, primarily through conduction and air leakage. Ducts can lose heat to their surroundings, especially if they are not well insulated or if they pass through unconditioned spaces like attics or crawl spaces.

The correct answer reflects that heat loss can be as high as 40%, which emphasizes the importance of proper duct insulation and sealing to maintain energy efficiency in heating systems. High heat loss in poorly insulated ducts can result in increased energy consumption and decreased system performance, leading to higher heating costs and discomfort in the conditioned space.

Recognizing that heat loss can reach such a substantial percentage underlines the necessity for homeowners and professionals to prioritize ductwork performance, including routine inspections, maintenance, and upgrades where needed.