Which of the following is not considered a home improvement?

Repairs to an HVAC system are classified as maintenance rather than a home improvement because they do not significantly enhance or alter the home’s structure, function, or aesthetic quality. Home improvement generally refers to renovations or upgrades that add value to a property, such as installing a new roof, painting the exterior, or replacing windows. In contrast, repairs, like those made to an HVAC system, are necessary to maintain the system's proper functioning but do not change its nature or substantially increase the home's value. This distinction is important in understanding what constitutes a home improvement versus routine maintenance or repair work.