The answer to 'when to replace air handler' is that you should typically replace your air handler every 10-15 years, or sooner if it's not functioning properly. The air handler is a crucial component of your HVAC system, responsible for circulating air throughout your home. Over time, the moving parts can wear down, leading to decreased efficiency and potential breakdowns.
Some signs it may be time to replace your air handler include unusual noises, reduced airflow, and higher energy bills. If your air handler is more than 10 years old and experiencing any of these issues, it's a good idea to have a professional HVAC technician evaluate it and recommend whether replacement is necessary.