Once a year at minimum, before cooling season — and in a manufactured home the case for it is stronger than in a site-built house, because these systems have less margin for error to begin with.
Why Mobile Home Systems Have Less Margin
Three structural differences make annual service matter more.
The ductwork is smaller. Belly ducts run beneath the floor in a single trunk with short branches, and they are more restrictive than site-built duct systems. Any additional airflow restriction — a dirty filter, a loaded blower wheel — hits harder here.
The envelope is less forgiving. A high surface-area-to-volume ratio and limited insulation mean the home gains heat faster in summer. The system runs more hours to keep up.
The ducts are in unconditioned space. Beneath the floor, exposed to outdoor temperatures with limited insulation, which is not where you want your cooled air travelling in a Hill Country August.
A system with narrow margins fails sooner when something drifts out of spec, and it produces comfort complaints earlier.
What Annual Service Covers
Refrigerant charge verified against specification — not topped off, verified. A system low on refrigerant has a leak, and running low destroys compressors.
Condenser coil cleaning, which matters because a coil that cannot reject heat makes the compressor work against elevated pressure every hour it runs.
Evaporator coil inspection, condensate drain clearing, blower wheel cleaning, capacitor and contactor testing under load, and a temperature split measurement that confirms the system is actually performing rather than merely running.
The Belly Duct Inspection
This is the item specific to manufactured homes, and it is frequently where the real problem is.
Over years the belly wrap deteriorates, rodents tear into it, and duct connections separate. A disconnected duct under the floor delivers your cooled air directly into the crawl space.
The symptom is a room that never gets comfortable no matter what the thermostat says — and homeowners often replace equipment trying to fix it, which solves nothing.
We inspect the underfloor system as part of service. Where it is compromised, duct sealing or duct repair delivers far more improvement than anything done to the equipment itself.
Filters Are the Homeowner’s Half
Because the ductwork is already restrictive, a clogged filter in a manufactured home can cause the evaporator coil to freeze — which sends liquid refrigerant back to the compressor and turns a maintenance issue into a replacement.
The filter location in these systems is often somewhere homeowners never find, and a surprising number of homes run with no filter at all or with one that does not fit the opening.
We show you where it is and which size actually fits. Options are on our air filters page. Check monthly during summer rather than following the package interval.
Timing
Book service in spring, before the first sustained heat. Finding a weak capacitor in March costs a small part; finding it in August costs a compressor and a wait behind everyone else calling at once.
Systems in manufactured homes run more hours during a Hill Country summer than most, which makes the timing more consequential, not less.
Equipment Listing Matters
One thing worth confirming if equipment has ever been replaced: manufactured homes require equipment listed specifically for the application.
Standard residential equipment installed in a manufactured home is not merely a code technicality — it can create genuine combustion safety problems on the heating side and will void insurance and warranty coverage.
We check that during service and tell you if something was installed incorrectly by a previous contractor.
When Ductless Is the Better Answer
Where the belly duct system is badly deteriorated, repairing it plus replacing central equipment sometimes costs more than installing ductless mini splits — which eliminate duct losses entirely and perform better afterward.
We will tell you honestly which path makes sense.
Service is covered under our Care Club maintenance plan, and details are on our mobile and manufactured homes page.
Contact 72 Degrees or call (830) 468-5316.
