Egypt Lake-Leto is suburban rather than historic, with ranch homes and later construction spread across streets west of the base. That age bracket is where attic and second-floor-chase installations become common in Florida, and it changes what a failure looks like.
An attic heater that seeps can soak insulation and drywall for weeks before a stain appears on a ceiling. When one is replaced, the pan, the drain line and the route in and out of the attic are part of the work, along with checking the platform for water damage from the previous unit.
The repair work itself is ordinary: hard-water scale, failed heating components, gas control faults on the units that run on gas, and relief valves doing their job badly on a closed system.
Subdivisions from the 1970s through the 1990s dominate here, and attic access is often a scuttle in a hallway ceiling rather than a proper stair. That makes a replacement a two-person job with a planned route, and it makes the pan and drain line more important than they would be in a garage.