Villas, manufactured homes and the SR 200 rooftops: where the package unit belongs in Marion County

Three Ocala building types that were built around one cabinet

The 1990s and 2000s villa. On Top of the World, Oak Run, Ocala Palms and the older sections of Stone Creek are full of attached villas with low roofs and no usable attic. The builder set one packaged heat pump on a pad outside the kitchen wall and ran two short ducts through the block. Those units are now anywhere from fifteen to thirty years old, and whole cul-de-sacs are replacing them in the same two or three years.

The manufactured home. About one in seventeen Marion County dwellings is a mobile or manufactured home, concentrated in the county outside Ocala’s limits and in the communities toward Belleview and Silver Springs Shores. Most were delivered with a package unit on the ground and a duct trunk under the floor.

The one-story commercial building. The retail strips along SR 200, the medical offices near the hospitals and the flex buildings near the I-75 logistics parks almost all run rooftop package units, one per tenant space.

In all three cases the problem being solved is the same: nowhere indoors to put an air handler, and a desire to keep the mechanical equipment, the noise and the condensate outside.

What a package unit actually is

Everything a split system puts in two places, in one weatherproof cabinet: compressor, both coils, blower, and either a heat pump reversing valve or electric heat strips. The ductwork connects directly to the cabinet. Service access is all outdoors, which technicians appreciate and which means every component lives in Marion County’s weather: 90-degree afternoons, 72-degree muggy nights, afternoon lightning and the occasional October tropical system.

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The tiers, without model numbers

Packaged equipment is simpler to shop than split equipment because the choices are fewer:

• Packaged heat pump versus packaged air conditioner with strips. Same as the split-system debate. For a villa that runs heat on the county’s seventeen or so freezing nights, the heat pump version pays back the difference.
• Single-stage versus two-stage. Two-stage runs longer and slower, pulls more moisture out of the house, and is noticeably quieter against a bedroom wall. For the 55+ communities, where the unit often sits a few feet from where people sleep, that matters.
• Gas/electric packs. Gas heat with electric cooling in one cabinet. Realistic only for commercial roofs already piped to Peoples Gas; nearly irrelevant for Ocala homes.
• Efficiency tier. SEER2 and HSPF2 ratings apply here as they do to split systems. Ocala Electric Utility’s residential heat pump rebate has historically set a minimum efficiency; packaged units that clear it exist, and we’ll tell you which [[CONFIRM WITH JERRY]] on the current threshold.

Installing one in Ocala

On the ground. A level pad on compacted base is the whole game. Marion County’s sandy soil settles, and a tilted unit drains its condensate the wrong way and strains its compressor mounts. We reset the pad on nearly every villa replacement. The duct sleeves through the block wall get resealed, because the original foam is usually gone and the gap has been feeding attic-temperature air into the return for a decade. A float switch goes in the drain. Surge protection goes at the disconnect, in the most lightning-prone county in the state.

On the roof. A new unit rarely matches the old curb exactly; we fabricate or order a curb adapter in advance so the crane lift is a single morning. Duct connections are sealed, the condensate is routed to a drain rather than onto the roof membrane, and the economizer, if the building has one, is set up for Ocala’s climate rather than left in the factory default.

Under a manufactured home. The duct trunk gets inspected and sealed before the new unit goes in. Half of the “the new unit doesn’t cool like the old one” calls on manufactured homes trace to a crossover duct that fell off under the floor.

Keeping it alive on a slab in the sun

A package unit’s coils collect oak pollen from February through May and grass clippings all summer. Rinse the condenser side gently from the inside out after the oaks finish; keep mulch and shrubs two feet back; change the filter monthly in summer, because on a package unit the filter is often in the return grille inside and gets forgotten. Two professional visits a year, spring and fall, cover the chemical coil cleaning, the drain, the refrigerant charge and the electrical connections that lightning season loosens.