You may need a new AC system installed if your current system is over 10-15 years old, frequently requires repairs, or no longer cools your home efficiently. Additionally, if you notice rising energy bills despite consistent usage, it could indicate that your AC is losing efficiency. Other signs include uneven cooling, strange noises, or excessive humidity in your home. A professional HVAC technician can assess your system and recommend whether repair or a new installation is the best solution.