The air conditioner never touches the well water. Except in these five places.

The myth, and the half of it that is true

Here is what nearly every well-water homeowner in Suwannee County believes, and what a fair number of technicians will tell them: the air conditioner is a sealed system, so the water coming out of the ground has nothing to do with it. The refrigerant loop is indeed sealed. The condensate it produces is pulled from the air and is as clean as distilled water.

The crust is only the visible part. Private wells on the Floridan aquifer across the county carry hydrogen sulfide, which is the rotten-egg smell, dissolved iron, which is the orange stain, and hardness, which is the white crust. It is the same rotten-egg note that once drew bathers to the sulfur spring at Suwannee Springs, a few miles north of Live Oak off US 129, and the wells in Dowling Oaks and around Wellborn pull from that same limestone. Houses in Sherwood Forest or River Woods that sit on City of Live Oak water can skip most of what follows. Those three meet the cooling system in five specific places, and in each one they shorten the life of something.

Place one: the drain line that shares a pipe

The condensate drain from the air handler rarely runs to daylight on its own. It ties into a utility sink drain, a washing-machine standpipe, a water-heater pan drain or a plumbing vent. Everything else on that pipe carries well water, and well water leaves iron and sulfur deposits on the pipe walls. Bacteria that feed on sulfur build a gray slime over those deposits. The clean condensate trickling through cannot clear it, and every August the line closes up and the float switch trips. Fix: a dedicated condensate drain to the outside where possible, a float switch where there is not one, and a flush each spring before cooling season.

Place two: the drain pan

A secondary pan under an attic or closet air handler is supposed to stay dry. In a well house it rarely does, and when it holds water, the iron and sulfur arrive by the same shared-drain route or from a hose used to rinse it. Orange sediment settles, slime grows on it, the float switch gets gummed, and eventually the pan rusts through. Fix: clean the pan with the drain each spring, keep the hose away from it, and replace a steel pan that is rusting with a plastic one.

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Place three: the garden hose on the outdoor coil

This one surprises people. Rinsing the condenser coil with the hose is good advice on city water. On untreated well water each rinse leaves a thin film of calcium, iron and sulfur on the aluminum fins, and the next afternoon bakes it on. A few summers of well-intentioned rinsing produces a coil that looks clean and sheds heat like a blanket. The system runs longer and hotter and the compressor pays. Fix: brush dry, rinse only with softened water, or have the coil cleaned with a proper solution once a year.

Place four: anything that uses water on purpose

Whole-home humidifiers, evaporative accessories and condensate pumps that double as drains for other appliances all take well water directly and scale up within a season or two. Fix: skip the humidifier in a climate that rarely needs one, specify any water-using accessory for well water or plumb it after treatment, and keep condensate pumps on condensate only.

Place five: the air itself

Hydrogen sulfide outgasses from well water at every faucet and shower, and a corrosive trace of it rides the house air back through the return and across the evaporator coil and the copper in the air handler. On its own it is slow. Combined with a damp drain pan and a closed-up house in July, it accelerates corrosion on the coil and the electrical terminals in the cabinet. Fix: treat the water at the well head if the smell is strong, keep the pan dry, and have the coil inspected for green and black corrosion at maintenance.

What we spec differently on a well house

When we install or replace a system on a well, the equipment is the same Lennox line we install anywhere. What changes is around it: a dedicated drain to the outside, a float switch as standard, a plastic secondary pan, no water-fed accessories unless the water is treated, a coated condenser coil where the sulfur is strong, and a note on the ticket that the coil is not to be hosed. None of it is expensive. All of it is the difference between a system that lasts eighteen years on a Suwannee County well and one that is fighting its own drain by year five.

All of it is part of a spring maintenance visit. Cook’s runs those visits across the county out of its Palm Coast headquarters at 37 Fairmont Ln, a 144-mile drive we make on a schedule, and the office picks up day or night without an after-hours fee.