The answer to 'when to replace air handler' is that you should typically replace your air handler every 10-15 years. Air handlers are the indoor unit of a central HVAC system that circulates air throughout your home. Over time, the components can wear out and the overall efficiency of the system decreases, leading to higher energy bills and reduced comfort.
Some key signs it may be time to replace your air handler include increased noise, reduced airflow, and higher utility costs. It's also a good idea to replace the air handler when you need to replace the outdoor condenser unit, as the two components work together as a system. Replacing both at the same time ensures optimal performance and efficiency.