The answer to 'how much to replace air handler in my area' is that the cost can vary significantly depending on several factors. Generally, the price to replace an air handler can range from around $1,500 to $5,000 or more, depending on the size, efficiency, and complexity of the unit, as well as your local labor rates.
Some key factors that influence the cost include the size and type of air handler (single-stage, two-stage, or variable speed), the accessibility of the unit, any necessary ductwork modifications, and the experience and labor rates of the HVAC contractor. It's important to get multiple quotes from reputable local HVAC companies to get an accurate estimate for your specific situation.