The duct under your manufactured home is costing you more than the unit is

What a package unit is, in one paragraph

A split system puts the compressor outside and the blower and indoor coil inside. A package unit puts all of it in one cabinet on a pad beside the home, and connects to the living space through two flexible ducts that pass through the skirting: a supply that feeds the trunk under the floor and a return that pulls air back. The machine is compact, serviceable from outside and tolerant of abuse. For a manufactured home with no closet for an air handler, it is the sensible choice and it is what most of Putnam County runs on.

What a belly duct is, and why it fails

Under the floor of a manufactured home, inside the fabric belly wrap, runs a rectangular metal or insulated flex trunk with short branches to each floor register. In a double-wide, a crossover connector joins the two halves. All of it hangs a foot or two off the ground in a space that is dark, damp in the river communities and sandy on the ridge, and visited by nothing but animals until something goes wrong.

It fails in predictable ways: seams split where the trunk was taped at the factory, branches pull off at the register boots, the crossover sags into a U that collects water or gets crushed when a pier settles, and the belly wrap tears and lets the insulation fall away so the duct sweats and drips. Every one of those faults pushes cooled air into the crawlspace instead of the rooms.

Three homes, worked out in words

A single-wide near Huntington, 1990s. The package unit is fine. The return connector has pulled loose at the skirting and the unit is drawing crawlspace air, hot and damp, straight into the coil. The home never gets below 80 in July and the Clay Electric bill is a third higher than the neighbor’s identical home. Reconnecting and sealing the return costs about what a family spends on a modest week of groceries and pays for itself in two or three summer bills.

A double-wide in East Palatka, 2000s. One half cools, the other does not. The crossover duct has sagged and holds water from last fall’s high river. Replacing the crossover and re-hanging it with proper straps is a half-day job priced in the low hundreds; the alternative, a second window unit for the warm half, would cost more to run every month for the rest of the home’s life.

A 1980s double-wide on the sand near Interlachen. The unit is twenty years old, the belly wrap has fallen away along a third of the length, the trunk is sweating, and the floor over it is soft. Here the duct and the unit are both at the end. The right move is a new high-efficiency package heat pump with a new belly duct, financed over a term with monthly payments that run somewhere between the old unit’s wasted power and the repair bills it would have kept generating.

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The fixes, ranked by what they pay back

1. Reconnect and seal the supply and return connectors at the skirting. Lowest cost, fastest payback. We find this on a large share of first visits.
2. Repair or replace the crossover. The double-wide fix. Modest cost, immediate comfort change.
3. Re-seal trunk seams and register boots with mastic. A few hours of work under the home; stops the slow leaks that cost a little every day.
4. Repair the belly wrap and insulation. Stops sweating and the floor damage that follows it.
5. Add or enlarge the return. Manufactured homes ship with returns that are too small; a second return grille lets the unit breathe.
6. Replace the trunk. When the metal has rusted through or the flex has collapsed in several places.
7. Replace the unit. When the compressor or coil gives out and the unit is fifteen-plus years old, or when efficiency alone justifies it.

Most homes need one or two items from the top of the list, not the bottom.

What the inspection covers

Under the skirting with a light, looking at every connector, seam and hanger; a pressure and temperature check at the registers to find the branch that is starved; a look at the pad level and the line of the crossover; a check of the return size against the unit’s airflow; and a note of any water marks on the belly wrap, which tell us whether the crawlspace floods. The whole thing takes less than an hour and is part of every maintenance visit on a manufactured home in our territory.

Where the homes are

Manufactured housing runs forty to fifty percent of the stock in some Putnam County neighborhoods: East Palatka and San Mateo on the east bank, the US 17 corridor through Satsuma and Pomona Park, the fern country around Huntington, Interlachen and Hollister on the ridge, and the SR 100 towns west of Palatka. Most are on wells, many are on Clay Electric, and nearly all sit low enough that the crawlspace is damp for part of the year. The belly duct is the weak link in every one of them, and it is the first thing we look at.