Humidity and indoor air quality in Altamonte Springs
Altamonte Springs runs about 3,452 cooling degree days a year against 525 heating degree days, roughly 75% average humidity and 51.5 inches of rain. The load here is water, not temperature: condensate management drives a large share of service calls, and an oversized system leaves a home cold and clammy rather than dry.
The load here is water, not temperature
NOAA 1991-2020 normalsThe nearest first-order station, Orlando International (USW00012815), records about 3,452 cooling degree days a year against 525 heating degree days on the NOAA 1991–2020 normals, an average annual temperature of 73°F, roughly 75% average relative humidity and about 51.5 inches of rain.
Cooling load nearly seven times heating load is the headline. The humidity is the part that decides how the equipment behaves. Latent removal means litres of condensate a day, a drain line that grows algae, and a system that has to run long enough to dehumidify rather than just to hit a setpoint.
NOAA 1991–2020 US Climate Normals, Orlando International Airport (USW00012815).
Condensate is the most common avoidable failure
Drainage, not refrigerantA large share of no-cooling calls in this market are not refrigerant problems. They are drainage problems: a condensate line blocked by algae and sludge trips the float switch, the system shuts down as designed, and the call comes in as a breakdown.
In an attached unit the drain is the whole game. A blocked primary line upstairs ends up in a neighbour's ceiling, and the secondary pan and float switch are the only thing standing between you and that bill. Shared drain stacks clog on somebody else's schedule.
Attic equipment means the pan that overflows is the one nobody has looked at since the last changeout. Add the oak canopy over Spring Oaks, Weathersfield and Oakland Estates: shade for the condenser, and a serious leaf load in the coil.
Cold and clammy is a sizing fault
More capacity makes it worseAn oversized system satisfies the thermostat before it has run long enough to remove moisture. The house gets cold and stays humid, which reads as “the AC is not working” even though it is over-delivering on temperature. Small attached units are the most exposed, and 61.65% of this city's units are multi-family.
The fix is sizing and run time, not a bigger machine and not a lower setpoint.
Salt air is not your problem here
Not the HVHZAltamonte Springs is inland, roughly 40 miles from either coast, so salt-air coil corrosion is not the driver it is in coastal Brevard or Volusia. Hurricanes crossing the peninsula still reach the city, and condenser anchorage still has to meet the Florida Building Code and ASCE 7 wind loads.
Seminole County is not in the High-Velocity Hurricane Zone. The HVHZ is Broward and Miami-Dade only, defined at 2023 Florida Building Code, Residential, 8th edition, Section R202. Any contractor page claiming otherwise for Seminole County is wrong, and it usually shows up attached to a coastal-grade product upsell.
2023 FBC-Residential, 8th edition, Section R202. Seminole County publishes ultimate design wind speeds of 129 mph (Risk Category I), 139 mph (II) and 149 mph (III/IV).