In Florida, the most common HVAC problem isn't a system that's too small — it's a system that's too big.
Oversized equipment cools the air so quickly that the system shuts off before it has run long enough to remove humidity. The result is a home that feels cool but clammy, with poor dehumidification and uneven comfort.
Oversizing also causes short-cycling: the system turns on and off frequently, which wears on components, increases energy use, and can shorten equipment life.
Proper sizing starts with a Manual J load calculation and Manual S equipment selection. When equipment is matched to the home's actual loads, it runs long enough to dehumidify, conditions evenly, and operates efficiently.
For Florida homes — especially high-performance envelopes and custom homes with large glazing — right-sizing is one of the most important decisions in the mechanical design. It's also one of the easiest to get wrong without proper calculations.