The answer to 'air duct sealing not heating' is that improper air duct sealing can prevent your HVAC system from effectively heating your home. Leaks and gaps in the ductwork allow heated air to escape before reaching the vents, reducing the overall heating efficiency.
Common causes include poor initial installation, damaged ducts, or ducts that have come loose over time. Symptoms include uneven heating, cold spots, and higher energy bills. The solution is to seal any leaks or gaps in the ductwork, either through DIY duct sealing or by hiring a professional HVAC technician to perform a more comprehensive duct inspection and sealing.