The answer to 'which is better air handler or' is that there is no simple answer, as the 'better' option depends on the specific needs and requirements of your home. Both air handlers and furnaces have their own advantages and disadvantages, and the right choice for your home will depend on factors like the size of your home, your heating and cooling needs, energy efficiency, and budget.
Air handlers are self-contained units that circulate air through your home's ductwork. They are typically more energy-efficient than furnaces, as they use electricity to power a fan rather than burning fuel. Air handlers are also quieter and can be installed in tight spaces like attics or closets. However, they may not provide as much heating power as a furnace, especially in colder climates.