In Dunnellon, the thermostat can be right and the house still feels wet

Humidity words

There is a vocabulary that Dunnellon homeowners use that we hear less often inland: sticky, clammy, the windows sweat in the morning, the closet smells, the bathroom towels never dry. These are humidity complaints, and in the Rainbow River and Withlacoochee corridor they are the dominant service call from June through September. The thermostat reads fine. The air conditioner is running. The house still feels wet.

The reason is that an air conditioner removes moisture only while it runs, and the longer the better. A system oversized for its house, which describes a great many 1970s and 80s installations in Rainbow Springs, satisfies the thermostat in a handful of minutes and stops before it has pulled much water out. Near two spring-fed rivers, with heavy ground moisture and a tree canopy that holds the damp air in place, that short-cycling system leaves the house at 75 degrees and 65 percent humidity. Sticky.

The place

Dunnellon sits where the Rainbow River meets the Withlacoochee at the western edge of Marion County, a river town with a historic downtown from the phosphate boom of the 1890s, Rainbow Springs State Park just north of it, and three distinct residential areas around it:

• The old town, with frame and block houses from the 1900s through the 1950s on city water, many with later central systems squeezed into small attics.
• Rainbow Springs, the large 1970s-80s subdivision along the river with block ranches, screened porches facing the water, and systems on their second or third replacement.
• Rainbow Lakes Estates, the sprawling platted community to the north, with homes from the 1970s onward on private wells and a share of manufactured homes.

Three fixes, in order of cost

First, make the existing system run longer. A fan set to auto rather than on, so the coil is not re-evaporating water into the duct; a slightly lower setpoint in the afternoon; a check that the charge and airflow are right so the coil actually gets cold. Cheap, and often enough on a reasonably sized system.

Second, when the system is due anyway, replace it with one that modulates. A heat pump with a modulating compressor, sized to the real load, idles along at low output for long stretches, which is exactly what moisture removal needs. This is the right answer for most Rainbow Springs homes with a twenty-year-old oversized unit.

Third, add a whole-home dehumidifier. Spliced into the return trunk, it dries the house on the mild, damp days of April and October when the air conditioner barely runs at all, and it carries the load in a closed house for a seasonal resident.

The rest of the Dunnellon list

Humidity is the headline, but the river corridor produces the same calls as the rest of west Marion: lightning-damaged boards after afternoon storms, scaled condensate pumps on well water in Rainbow Lakes Estates, pollen-choked coils in spring under the oaks, and strip heat that fails on the first freeze of January. Dunnellon is outside Ocala Electric’s territory, so the bill comes from Duke Energy or a co-op, and Duke’s replacement rebate after a free energy check is often the one that applies.

From the coast to the river

Measured from the Cook’s lot, 37 Fairmont Ln in Palm Coast, Dunnellon is about two hours and twenty minutes by SR 40 across the Ocala National Forest and west past Ocala. There is no office on the river. The west county is scheduled in bundled days, a dispatcher is live around the clock, and a Sunday invoice matches a Tuesday one.