Which action is NOT typically recommended for improving HVAC energy efficiency?

Neglecting air leaks in ducts is indeed not recommended for improving HVAC energy efficiency. Air leaks can significantly reduce the overall efficiency of an HVAC system, as conditioned air can escape from ducts, leading to wasted energy and increased utility bills. When there are leaks in the ductwork, the system has to work harder to maintain the desired temperature, which not only uses more energy but can also lead to uneven heating or cooling throughout the space.

Regular maintenance, installing programmable thermostats, and properly sealing windows and doors are all positive actions that contribute to improved efficiency. Regular maintenance helps ensure that the HVAC system operates smoothly and any worn or inefficient components are addressed. Programmable thermostats allow homeowners to better control heating and cooling schedules, reducing energy use during unoccupied times. Sealing windows and doors can help maintain indoor temperatures by preventing conditioned air from escaping, thereby lessening the workload on the HVAC system.