When the FPL bill and the musty smell show up in the same month

Humidity is the link: the two-paragraph version

In Palm Coast, a house that smells musty and a house with a high summer electric bill are usually the same house, and the reason is moisture. The air conditioner is being asked to dry the air as a side effect of cooling it, and it can’t keep up. It runs longer, the bill climbs, and the humidity never quite drops below the level where coils, ducts and closets grow things.

The fixes, roughly from most to least often the right call: get the system to run longer and lower, add a whole-home dehumidifier, correct the filtration so airflow isn’t choked, clean what’s already growing, and in tight new houses add controlled ventilation. We’ll tell you which after measuring, not before.

Why bills and smells travel together here

FPL supplies every home in Flagler County, and in a climate where July’s normal is 88 degrees with a 76-degree night and dew points parked in the mid-70s, most of a summer bill is the air conditioner. An air conditioner does two jobs at once: it lowers the temperature, which is the part the thermostat sees, and it condenses water out of the air, which the thermostat ignores.

Here’s where it goes wrong in Palm Coast houses specifically:

• Oversized systems. The 2004-2007 builders across Lehigh Woods, Quail Hollow and Indian Trails tended to round up. A big unit hits 76 fast and shuts off before it’s pulled much water. The house is cool and clammy. The homeowner drops the setpoint to 72 to feel comfortable, and now the bill is high too.
• Fan set to ON. The blower runs between cycles, re-evaporating water off the wet coil and blowing it back into the rooms.
• Leaky return ducts. ITT-era attic duct in Palm Harbor and the Woodlands pulls hot, saturated attic air into the system every time the fan runs. The air conditioner is dehumidifying the attic.
• September. The wettest month, with 90-plus percent humidity for days after a tropical system. Drains clog, pans overflow, closets smell.
• Houses left empty. Snowbird homes in Hammock Dunes and Grand Haven set to 82 with no humidity control come back in October smelling like a boathouse.

The musty smell is the biofilm on the coil, in the pan and in the duct. The high bill is the system running long and hard to fail at a job it was never designed to do alone.

What we install, and when

Whole-home dehumidifier. Plumbed into the return trunk, draining to the condensate line, with its own humidistat. Pulls water independently of cooling, so the thermostat can sit at 76 or 77 and the house feels like 74. The single most effective change for a Palm Coast house with a sticky problem.

Media filtration cabinet. A four- or five-inch pleated filter in a proper cabinet at the air handler. Far more surface area than a one-inch filter, so it catches more without starving the blower. Changes two or three times a year instead of monthly, pollen season excepted.

UV lamp at the coil. Keeps the evaporator and the pan from growing the film that causes the smell. Not a filter, not a purifier; a maintenance device that works while you’re not thinking about it.

Ventilation. New, tight houses in Sawmill Creek and Seminole Woods can trap cooking, cleaning and off-gassing indoors. An energy-recovery ventilator brings in outside air while shedding most of its heat and moisture, which in this climate is the only kind of fresh-air system that doesn’t create a humidity problem of its own.

Coil and duct cleaning. When the growth is already there, cleaning comes before any of the above.

Ask about a humidity fix

What sets the price of a humidity fix

You’ll get the options and the numbers in writing after the measurements, with the one we’d pick marked. When air-quality equipment goes in alongside a new system, the whole package can ride on one set of monthly installments.

Scheduling an air-quality visit

Humidity isn’t an emergency, but water in the pan or a drain backing up in September is, and we treat it that way around the clock with no after-hours markup. For the measuring visit, call 866-266-5709 and plan on an hour; we’ll want to walk every room with a meter, look at the coil and the pan, and check the attic duct. Mornings are best for the smell, since it’s strongest on the first cycle of the day.

One honest note: we’re an HVAC company, not a mold remediation firm. If what we find at the coil or in the duct goes beyond cleaning, we’ll say so and point you to the right specialist rather than sell you a lamp.