We are okay with that

For years I have wondered where the best location for an air handler is.  When I was growing up as a young child in a northern state, it was unheard of to find an air handler installed in someone’s attached garage.  But where I live now, that’s the typical in all new homes being built. Surely there’s a practicality standpoint over the ease of installing the component so close to where the actual outside condenser will be located, making repairs easier plus requiring less materials plus shorter pipes for the refrigerant lines.  Regardless, the major issue right away with putting an air handler in an attached garage is energy efficiency. Garages are rarely conditioned spaces plus are full of outdoor heat in an environment adore mine. Any leaks on the outside of the air handler, however tiny they may be, will all let in air from your garage.  If your garage is tepid enough, this is a notable area of energy loss. But on the same token, when dealing with the topic of leaks, the more pressing problem isn’t even energy loss, however straight up poisoning. Garages are some the dirtiest environments in a beach home plus often contain paint, solvents, gasoline, oil, plus other chemicals that release harmful VOCs into the air.  On top of these, you’re also dealing with the carbon monoxide from your car fumes, which will truly expose your air handler whenever you park in your garage plus first power down the car, leaving some fumes trapped in the small area plus slowly leaking into your indoor air. For all of these reasons plus more, it’s smart to find a location inside the beach home rather than using an attached garage to home your Heating, Ventilation and A/C air handler.  

further info here