HVAC in Alabama is the equipment that has to pull water out of Gulf air and still cool a brick ranch in August. If the coil freezes, the upstairs never drops, or the closet smells like a wet filter, say that plainly. Comfort talk is useless until the failure has a room and a sound.
Heat pumps carry a lot of the state, with air handlers in hot attics that bake the ducts before the air reaches a bedroom. Crawl-space ducts sweat, sag, and come apart at the collar. A return starved by closed doors makes a whistle and a coil that ices over on a humid night. Bonus rooms over garages stay hot because the duct run is long and the roof is close.
Along the coast the load is moisture as much as heat. A system that blasts cold air and shuts off leaves the room clammy and the sofa damp. Inland hills get a drier afternoon and a colder night, and a heat strip that runs without end is a different complaint from a drain pan that overflows into a ceiling. Filters pack with pine pollen in spring and the airflow falls off.
Look at the outdoor unit before you call. Note whether the fan runs, whether ice is on the line, and whether the pad has sunk into red clay so the cabinet sits crooked. Inside, say which rooms fail and whether the problem is heat, smell, noise, or water at the air handler. A tripped switch and a dead compressor are not the same story.
Have the house type ready. Bungalow attic, slab ranch, pier cottage, two-story with the equipment in a downhill basement. Say how long the system has misbehaved and what changed, such as a new room or a closed vent. Do not bury the lead in a brand name you half remember. The call should start with the room that will not cool and the water you can see. Call the number on this page.