The answer to 'should I get air handler or' is that the choice between an air handler and a furnace/AC unit depends on your home's heating and cooling needs, energy efficiency goals, and budget. Air handlers are self-contained units that circulate air throughout your home, while furnace/AC systems have a separate furnace and air conditioner. Air handlers are generally more energy-efficient and can provide both heating and cooling, but they also tend to be more expensive upfront.
The best option for your home will depend on factors like the size of your home, your climate, and your preference for features like zoned temperature control or smart home integration. In many cases, an air handler can be a good choice for modern, energy-efficient homes, but a furnace/AC system may be more cost-effective for older homes or those with specific heating or cooling requirements.