Fresh-air ventilation for Palm Coast's tight new houses
Houses built in Palm Coast in the last few years are tight enough that they no longer breathe on their own. An energy-recovery ventilator is how you give one fresh air without inviting August inside.
From a stuffy Sawmill Creek living room to a running ERV in a week
Day one. A couple in a year-old house in Sawmill Creek calls because the living room smells of last night’s dinner every morning and the bathroom mirror stays fogged for an hour. The house is clean, the AC is new, the humidity reads 58 percent. We book a visit.
Day two. A technician confirms what the symptoms suggest: a tight envelope, exhaust fans that work, and nothing bringing air in. He measures the house volume, counts bedrooms, and sizes the fresh-air rate to the ventilation standard.
Day three. Quote delivered: an energy-recovery ventilator, intake and exhaust hoods, insulated ducts, a control in the hallway.
Day six. Install. The unit hangs from the trusses near the air handler; two ducts go to exterior hoods on the shaded gable, two tie into the return and a far bedroom.
Day seven. Airflow balanced with a hood, filters in, control set. The morning smell is gone within a few days.
What changed: houses got tight before ventilation caught up
Palm Coast’s boom-era houses in Lehigh Woods and Quail Hollow leak enough through attic hatches, recessed lights and duct seams that they ventilate themselves, badly, with hot attic air. Current code tightened the envelope, added blower-door testing and sealed the ducts, which is good for the FPL bill and bad for air changes. Builders are now required to provide mechanical ventilation, and many meet the letter of it with a simple fresh-air damper on the return that dumps humid outdoor air straight into the system. In a climate with mid-70s dew points, that’s a dehumidification problem waiting to happen. Energy-recovery ventilators are the better answer, and they’ve become smaller, quieter and cheaper than the units of a decade ago.
ERV, not HRV, for a humid coast
A heat-recovery ventilator (HRV) transfers heat between the incoming and outgoing streams but not moisture. It suits cold, dry climates. An energy-recovery ventilator (ERV) transfers both, so in a Palm Coast July the incoming air gives up most of its heat and much of its humidity to the air leaving the house. That difference is the whole reason to specify an ERV here, and why we don’t install HRVs in Flagler County.
Ask about fresh-air ventilation
Buying guidance for a Palm Coast build or retrofit
- Size to the ventilation standard, based on floor area and bedrooms, not to the biggest unit that fits.
- Choose a model with a washable or replaceable intake filter you can reach; pollen season will test it.
- Insist on insulated ducts in the attic so the fresh-air duct doesn’t sweat onto the drywall.
- Put the control where you’ll see it, with a boost mode for parties and cooking.
- Pair it with a dehumidifier if the house has shown humidity problems; the ERV reduces the moisture load but doesn’t remove it.
Retrofits into older Palm Coast homes are possible but less often needed; a 1990s Indian Trails house usually ventilates itself through its leaks. Sealing those leaks and then adding an ERV is the right order if you go that route.
The install, in order
Mount the unit near the air handler with service access. Run two insulated ducts to exterior hoods, intake on the shaded side away from the dryer vent and garage, exhaust well separated from it. Tie supply into the return or a dedicated register, and pull stale air from a bathroom or hallway. Wire the control, set the rates, balance with a flow hood, and label the filters. The whole job is usually a day on a new build with attic access and a little longer where the ducts have to thread through finished space.
Ventilation questions from Palm Coast's newest streets
Does a new house in Seminole Woods really need mechanical ventilation?
If it passed a blower-door test, which current code requires, it’s tight enough that cooking fumes, moisture from showers and everything off-gassing from new finishes have nowhere to go. Code-required bath and range fans push air out; an ERV is how measured fresh air comes back in.
Will bringing in outside air make the house more humid?
With an ERV, only a little. The energy-recovery core passes most of the incoming air’s heat and moisture to the outgoing stale air. With a plain fresh-air duct and no recovery, yes, which is why we don’t install those here.
Can an ERV run off my existing air handler?
It can tie into the return ductwork so the air handler distributes the fresh air, or it can have its own small duct runs. Tied-in is simpler; dedicated ducts give better control. Either way it has its own fans and its own controls.
What does an ERV do during the February pollen weeks?
Its intake filter catches most of the pollen before it enters the core, which is why that filter needs checking every spring. Some owners run the unit at a lower rate for a few weeks; it’s a setting, not a shutdown.
New house, stale air?
We'll size an ERV for the floor plan and show you where it goes.