The Ultimate Comfort System in a 1998 Ocala house versus a new Calesa Township build: the ductwork decides

The August bill that starts the conversation

An Ocala Electric Utility bill arrives in early September for a 1998 house in Southeast Ocala. It’s the highest of the year, as it always is, and the house was never quite comfortable: 74 on the thermostat, damp in the afternoons, a system that cycles every twelve minutes from 2 p.m. to 9 p.m.

The homeowner has read about the Lennox Ultimate Comfort System: variable capacity, whisper-quiet, holds humidity like a hotel. The question they ask is whether it’s worth it. The question we ask first is what the ducts look like.

Retrofit versus new construction

In an existing house, the flagship system’s advantage comes from running at low capacity for long stretches. That means moving a steady, moderate volume of air through the ducts for hours. Ocala’s 1990s and 2000s subdivisions were generally built with flex duct sized for a single-stage system that blasts and stops. Undersized runs, kinked flex, a single return in the hall: all of them cap what a variable system can do. Put the flagship on those ducts and you’ve paid for a Thoroughbred and hitched it to a cart.

So a retrofit quote includes a duct test and, usually, duct work: a second return, resized trunks, sealing, sometimes a new plenum. In the 1970s and ’80s block houses that make up 40 percent of the city’s stock, that work can be substantial. It’s also the single most effective thing done to the house, and Ocala Electric Utility’s repair rebate puts money toward duct leak repair with a licensed contractor’s receipt.

In new construction, the ducts can be designed around the system before the drywall goes up. Calesa Township, Ocala Preserve, Stone Creek’s newer phases and the Golden Ocala estates are where this is happening now, in a metro that led the nation in growth in 2025. A variable-capacity system on purpose-built ducts in a tight new house is where the equipment performs the way the brochure says.

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What Ocala’s ducts actually look like

• 1970s and ’80s block ranches (Silver Springs Shores, Marion Oaks, older in-town streets): attic flex or fiberglass duct board, often original, leaking a fifth of its air, one small return. Needs a rebuild before the flagship.
• 1990s and 2000s villas and single-stories (the SR 200 corridor, Fore Ranch, Heath Brook): flex duct in reasonable shape, returns undersized for low-speed operation. Needs a second return and sealing.
• 2015-and-newer construction: tight, often spray-foamed, ducts sometimes in conditioned space. Ready, or nearly.
• Historic District houses: retrofit duct threaded through closets and soffits, often too small. Candidates for the flagship’s ductless or zoned variants rather than a straight swap.

Sizing

A variable-capacity system forgives small sizing errors because it modulates, but it does not forgive a big one. We run a load calculation on every house: square footage, orientation, glass, insulation, duct leakage, occupancy. Ocala houses are commonly a half-ton oversized by their original installer, and the flagship’s dehumidification advantage disappears if we repeat that mistake. The right size is often smaller than the unit coming out.

Who should buy it here

The homeowner who intends to stay, who cares about humidity and quiet more than purchase price, and whose house either has good ducts or is willing to get them. The 55+ household in Candler Hills that spends August indoors. The horse-country estate with a big single-story footprint and a zoning problem. The new-construction buyer who can spec the ducts. Financing with low monthly payments is available on new high-efficiency systems, and the estimate, duct test included, is free.