Geothermal under Ocala's limestone: who asks for it, from horse farms to 1980s block ranches

Four generations of Ocala houses, four kinds of heating and cooling

Marion County’s housing stock reads like a timeline. Roughly 18 percent of Ocala’s homes went up in the 1970s and another 18 percent in the 1980s: concrete-block ranches on slabs in Silver Springs Shores and Marion Oaks, air handler in the attic, flex duct that is now older than the people living under it, and a straight-cool system with electric heat strips or, if it’s been replaced, a heat pump.

The 1990s brought the first of the big 55+ communities. Ocala Palms, built from 1994 to 1997, is a thousand villas with package units and heat pumps that are now on their second or third system.

The 2000s wave, another 18 percent of the stock, filled Fore Ranch, Heath Brook and the early sections of Stone Creek with stucco two-stories and builder-grade split heat pumps that are reaching the end of their first life right now.

And since 2010, Ocala has been the fastest-growing metro in the country. Ocala Preserve, Calesa Township, the estates at Golden Ocala, and the hobby farms and training centers of the Equestrian Corridor toward Reddick are tight, new, and often sitting on more land than the house needs.

Each era has its own heating and cooling story. Geothermal belongs to the last one, and to the handful of older properties with acreage.

Who calls about geothermal in Marion County

Three kinds of owners pick up the phone about ground-source heat pumps here.

Farm and acreage owners. The horse country north and west of the city is full of five-to-forty-acre properties with a main house, a barn, and sometimes a manager’s residence. Open pasture is exactly what a horizontal loop field wants, and these owners are already thinking in decades.

Estate builders and buyers. A new home at Golden Ocala or on a large lot in the Preserve is designed from a clean sheet. When the equipment choice is made before the slab is poured, geothermal’s higher first cost competes against a conventional system on even terms.

Owners of older houses on big lots who are tired of the bill. A 1980s ranch on an acre out toward Silver Springs with a dying heat pump and a Duke Energy or SECO bill that climbs every summer. These are the hardest cases to pencil out and the most satisfying when they do.

Three properties, three loop designs

Here are three kinds of Marion County property that ask for geothermal, and how the loop design changes for each.

A twelve-acre training farm off US 441 near Reddick. Pasture on three sides of the house, sandy soil over limestone. Horizontal slinky loops trenched six to eight feet deep across a corner of the paddock, a ground-source unit in the garage, and a second small unit for the barn office. The owner’s priority: never hearing a condenser near the horses again.

A new estate home at Golden Ocala. A one-acre lot, mostly landscaped, with the house still framed. Vertical bores along the side yard where a trencher couldn’t go, designed after a geotechnical look at the lot because this is karst country. The equipment sits in a mechanical room that was sized for it on the plans.

A 1984 block ranch on a half-acre in Southeast Ocala. The most constrained of the three. Enough yard for a compact horizontal field, a ground-source unit replacing the attic air handler in a new garage closet, and a hard conversation about the original duct, which gets replaced as part of the job because a high-efficiency system pushing air through 1984 flex duct is a waste of the investment.

Ask about a geothermal site visit

From soil report to first cooling cycle: how we run a geothermal job here

1. Site walk. Lot size, soil, slope, where the equipment will live, where the lines can run.
2. Geology check. Ocala sits in what the insurance industry calls Sinkhole Alley. Where the lot has known karst features or a history, we lean toward shallow horizontal loops and bring in a geotechnical opinion before anyone drills.
3. Load calculation. The house is measured, not guessed at. Geothermal is sized tighter than conventional equipment because oversizing wastes both loop and money.
4. Loop design. Horizontal or vertical, length, pipe, antifreeze mix. Florida ground stays warm enough year-round that the loop is a heat sink in July and a heat source in January.
5. Permits and scheduling. Excavation or drilling is coordinated with the trade contractor, and the timeline is given to you honestly.
6. Installation. Loops set and pressure-tested, trenches backfilled, manifold and flow center mounted, ground-source unit set, ducts connected or replaced, electrical completed.
7. Startup. Loop flushed and purged, flow verified, refrigerant side checked, and a full cycle in each mode before we leave.

What we put in writing

A geothermal quote from Cook’s spells out the loop design and its warranty, the equipment and its manufacturer warranty, what happens to the old system, the duct work included or excluded, the timeline, and the financing available with low monthly payments. The federal 25D credit for geothermal ended for systems placed in service after December 31, 2025, so it is not in the quote and we won’t imply it. Current utility and manufacturer incentives, where they apply, are listed by name. Satisfaction is guaranteed on the installation, and the labor terms specific to geothermal are worth asking about before you sign. [[CONFIRM WITH JERRY]]