What the Fore Ranch depression taught us about where a pad goes
The ground under Ocala is Swiss cheese made of limestone. Most of the time it holds. When it doesn't, the outdoor unit is usually the first thing in the yard to tell you.
Two events that changed how we set a pad
In 2018, engineers were called to a Fore Ranch neighborhood in Southwest Ocala to inspect a cluster of depressions that had opened in yards and near a retention area. In 2015, a water main in Oak Run on SR 200 collapsed into a sinkhole, and the community spent days without reliable water while the ground was stabilized. Neither event took a house. Both took things in the yard, and both made the same point: in Marion County, the ground an air conditioner sits on is not a given.
The county lies on the Ocala Limestone, a porous rock dissolved by groundwater into caverns and channels, and it falls inside what geologists and insurers call Florida’s sinkhole belt. Heavy rain, the drawdown of the aquifer in dry years and the weight of new construction all open voids. Most of them become slow depressions rather than dramatic collapses. A depression is more than enough to tilt a pad.
Why a tilted unit matters
An outdoor unit is designed to sit level. When the pad tilts:
- The compressor’s oil pools on the low side, and the bearings on the high side run drier.
- The refrigerant line set pulls tight where it enters the wall; a brazed joint that was fine under no load cracks under a sustained pull, and a slow leak begins.
- The electrical whip and disconnect strain at their fittings.
- The condensate and drain lines nearby lose their pitch and start holding water.
- The cabinet collects rainwater on the low side and the base rusts.
A unit that has tilted a few degrees usually keeps running. It also starts losing refrigerant and oil, and the failure shows up a year later as a compressor problem that looks unrelated to the yard.
How we mount equipment in Marion County
The base. A composite or concrete pad set on a bed of compacted gravel rather than on sod or loose fill. Gravel drains, spreads load and settles evenly. A pad poured or dropped onto topsoil settles toward the house, because the backfill against the foundation is the loosest soil in the yard.
The stand, where it fits. An adjustable steel stand over compacted gravel is our preference on lots with any history of settlement or standing water. It can be re-leveled with a wrench, it lifts the electrical compartment above puddles, and its footprint settles more predictably than a large slab.
The line set. A gentle loop or offset in the refrigerant lines between the unit and the wall, so a few inches of movement in any direction is taken up by the loop instead of the brazed joints. Lines that run dead straight from the unit into the wall are the ones that crack.
The electrical. A flexible whip of generous length between the disconnect and the unit, and the disconnect mounted on the wall, not the pad.
The drain. Condensate lines routed with real pitch and a cleanout, kept away from the pad so a settling pad does not reverse the fall.
The location. Away from retention ponds, swales and the low side of the lot, where water collects and the ground is most active. Away from downspouts that dump water at the foundation and soften the soil beside the pad.
What to check if a depression appears
If a dip opens in your yard, or after a week of heavy summer rain, walk the outdoor unit:
- Put a level on the cabinet top. A few degrees is a call; more than that is a same-week call.
- Look at the line set at the wall. Is it straight and tight, or does it still have slack? Oil staining on the insulation at a joint means a leak has started.
- Look at the pad edges. A gap between the pad and the soil on one side, or soil mounded against it on the other, means it has moved.
- Check the disconnect and whip. Any pulled fitting is an electrical hazard.
- Check the drain outlet nearby. If it is now below the pan, the drain will back up.
- Photograph everything before anything is touched, for your records and your insurer.
Then call. We re-level, check the brazed joints under pressure, test the charge and document what we find.
Slab-mounted indoor equipment
The same geology affects the house side. Marion County homes are overwhelmingly slab-on-grade, and an air handler on a garage stand or a package unit’s plenum through a slab wall depends on that slab staying flat. A hairline crack in a garage slab is common and usually harmless. A crack that opens, or a stand that no longer sits flat, is worth mentioning when we visit; a plenum that has separated from the wall is leaking conditioned air into the gap.
Where the risk is highest
Nowhere in the county is exempt, but the pattern of recorded depressions follows the SR 200 corridor, Southwest Ocala’s newer subdivisions built over former pasture, and the low ground near retention ponds that failed during the June 2023 flooding. Homes in these areas get the stand-and-loop treatment from us by default; others get it when the yard tells us to.
The company behind the pad
Cook’s installs and services across Marion County from its headquarters at 37 Fairmont Ln in Palm Coast, a drive of about two hours. The pad, stand, gravel and line-set loop go on the truck with the equipment, so the mounting is done right on the install day rather than promised for a return trip. A dispatcher answers at any hour, and the rate does not change after dark.
Questions about pads, stands and shifting ground
My outdoor unit has tilted a little since last year. Is that an emergency?
Not an emergency, but a phone call. A tilt of a few degrees stresses the compressor’s oil return and pulls the line set tight at the wall. We re-level the pad or stand and check the brazed joints before a slow tilt becomes a cracked line.
Can a sinkhole damage the air conditioner even if the house is fine?
Yes. The depression that opened in Fore Ranch in 2018 and the water-main collapse in Oak Run in 2015 were both outside the houses. Pads, line sets, buried electrical conduit and drain lines are all in the yard, and they move with it.
Will insurance cover a unit damaged by ground movement?
Florida policies treat catastrophic ground collapse and ordinary settling very differently, and owners generally bear repair costs for settling. We document the damage with photos and a written description you can hand to your adjuster; whether it is covered is between you and the policy.
Does elevating the unit on a stand help with sinkholes, or only flooding?
Both, differently. For flooding, the stand raises the electrical compartment above standing water. For ground movement, an adjustable stand can be re-leveled in minutes without pouring a new pad, and its small footprint on compacted gravel settles more evenly than a large slab.
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