When the JEA bill says the ground under your lot is the cheapest place to put heat

Reading the August JEA bill

A high summer electric bill in Jacksonville usually points at one of four things, and only the last of them leads to geothermal.

The first is duct leakage. In the 1950s to 1970s block ranches of Arlington, Westside and the Southside, attic ductwork leaks conditioned air into a 130-degree attic and pulls attic air back into the house. The second is an oversized or dying system in one of the post-2000 subdivisions, short-cycling or running flat out with a half-charged coil. The third is heat strips running when they should not, which shows up in January, not August. We fix all three for a fraction of what a ground loop costs, and we will tell you so.

The fourth is a large house, a large lot or a commercial building that is simply moving a great deal of heat for seven or eight months a year, with a bill that scales with the square footage. When the house is already tight and the ducts are already sealed and the number is still high, the next lever is the efficiency of the heat pump itself. A ground loop is the most efficient heat pump there is, because the sand under a Jacksonville yard holds a steady temperature in the low 70s while the air above it swings from 26 to 95.

That is the geothermal case here. Not an environmental statement, though it is one. An operating-cost decision for a property that has already done everything else.

Residential and commercial: two different jobs

The equipment is the same idea. The loop field is not.

Residential installations in Jacksonville are usually horizontal: trenches cut six to eight feet deep across the yard, with HDPE pipe laid in loops and backfilled. That requires land. The big oak-shaded lots in Mandarin and Ortega, acreage in Bryceville and out US 90 toward Glen St. Mary, and the newer estate parcels in Nassau County qualify. A quarter-acre lot in Sunbeam generally does not, and a townhome near St. Johns Town Center never does. Vertical bores are possible on small residential lots, but the drilling cost changes the arithmetic.

Commercial installations go vertical almost by default: boreholes hundreds of feet deep spaced across a parking lot or landscape strip, tied together in a manifold and run to one or more heat pumps inside. An office in a Baymeadows business park, a medical building near the Southside hospitals or a church with a large lot in Arlington can put the entire loop field under pavement nobody will ever see. Commercial jobs also involve three-phase power, engineered drawings, and coordination with a general contractor if the building is new or being renovated.

The process, from site walk to first cooling cycle

1. Site walk and load calculation. We measure the building, inspect the duct and look at the land. If geothermal does not fit, this is where we say it.
2. Loop design. Horizontal or vertical, how many circuits, how deep. In the Nassau and Baker exurbs we also look at the well situation; open-loop systems that draw on hard Floridan Aquifer water full of iron and sulfur are a maintenance headache, and we design closed loops instead.
3. Permits. Mechanical permits in Duval, Nassau or Baker, plus any well or drilling permits for vertical bores. We pull them.
4. Excavation or drilling. One to three days for a horizontal field; longer for vertical bores depending on count and depth.
5. Pipe, pressure test, backfill. Every loop is pressure-tested before the trench closes.
6. Indoor equipment. The geothermal heat pump replaces the air handler and condenser both. Manifold, pumps and a desuperheater for hot water if you want one.
7. Startup and balancing. Flow rates, entering and leaving water temperatures, and duct airflow all recorded.

Ask about a geothermal site walk

Schedule expectations for a loop field

A horizontal residential system is typically two to four working days on site, weather permitting, plus permit lead time. Jacksonville’s summer thunderstorms interrupt trenching, so a July install carries more schedule risk than a February one. Vertical commercial fields run one to several weeks depending on bore count. Equipment lead times vary by model and are quoted at the time. From signed quote to running system, plan on weeks, not days, and we will give you a written schedule rather than a hopeful one.

Reading a geothermal invoice

Geothermal quotes are longer than conventional ones because more things are being built. Expect line items for:

• Excavation or drilling, by the foot or by the trench
• Loop pipe, fittings and grout or backfill
• Manifold, circulating pumps and antifreeze solution
• The geothermal heat pump itself, and a desuperheater if specified
• Duct modifications, if the static pressure test called for them
• Electrical work, including surge protection, which matters in a city with Northeast Florida’s lightning counts
• Permits and inspections
• Removal and disposal of the old equipment

Financing with low monthly payments is available on new high-efficiency systems and is quoted in writing. Ask whether any rebate specific to geothermal exists in JEA territory; the federal 25C credit ended December 31, 2025, and we will not quote it. [[CONFIRM WITH JERRY]] No price appears on this page because no two loop fields are alike, and a number without a site walk would be a guess.

After startup

A geothermal heat pump needs less attention than an outdoor condenser, because the part that used to sit in the salt air and the pollen is now underground. What remains is indoor: filter changes, coil cleaning, drain treatment, and an annual check of loop pressure and flow. Cook’s maintains the systems it installs and the ones it did not, on the same two-visit rhythm as any Jacksonville heat pump.