The answer to 'how much does air handler cost' is that the cost of an air handler can vary significantly depending on several factors. Generally, a new air handler for a residential home can range from around $1,500 to $4,000 or more, installed.
The exact cost will depend on the size and capacity of the air handler needed for your home, the brand and model, the complexity of the installation, and your local labor rates. Larger or more advanced air handlers with features like variable-speed motors or built-in dehumidification can be on the higher end of that range.