Salt air is the invisible enemy of coastal HVAC systems. Along Pinellas County’s Gulf Coast, ocean breeze carries microscopic salt that corrodes coils, fasteners, and electrical connections—slashing efficiency and shortening lifespan. This guide explains how corrosion happens, the early warning signs, and the exact maintenance cadence for beachfront, near-coastal, and inland homes. You’ll get safe DIY rinse tips, what not to do, pro-grade coil coatings, stainless hardware upgrades, smart placement, and a clear maintenance-vs-replacement lens. Protect comfort and cut costs with a plan built for beach living.