The answer to 'which is better air handler or' is that air handlers and furnaces both have their own advantages and the best choice depends on your specific home and heating/cooling needs. Air handlers are self-contained units that circulate air throughout your home, while furnaces generate hot air that is then distributed. Air handlers are often more energy-efficient and can provide both heating and cooling, but furnaces may be a better option if you need more powerful heating or if your home is not well-insulated.
When choosing between an air handler or furnace, consider factors like the size of your home, your climate, energy efficiency needs, and installation requirements. An experienced HVAC professional can help evaluate your situation and recommend the best solution.