A field note
The maintenance record nobody is keeping
Most buildings on this coast are maintained. Far fewer can prove it. The distance between those two sentences is where warranty claims are refused, insurance settlements are argued down, and equipment that should have reached eighteen years is replaced at eleven.
Published 1 November 2026
The arithmetic
What does preventive maintenance actually buy you?
Not the avoidance of failure. Equipment fails regardless. It buys the difference between a failure you schedule and a failure that schedules you — and on a coastline it buys years of service life that chloride would otherwise take quietly, a season at a time.
| What gets skipped | Typical interval | What the skip actually does |
|---|---|---|
| Filter changes | Per the manufacturer; often monthly to quarterly in this climate | Restricted airflow, a coil that ices, and a compressor working against a load it was never sized for. |
| Condenser rinse | Quarterly within sight of salt water | Salt deposits hold moisture against aluminium fin and copper tube. Capacity falls for a long time before anything breaks. |
| Chemical coil clean | Annually, or as fouling dictates | A rinse takes off what is on the surface. What has driven into the fin pack stays, and that heat transfer does not come back. |
| Condensate treatment | Through the cooling season | A blocked drain pan is among the most common water-damage claims in a Florida building, and among the cheapest things to prevent. |
| Belts and bearings | Quarterly | A belt costs very little. The motor it takes with it does not. |
| Generator load test | Annually, under load | A weekly start proves the battery. It proves nothing about whether the set will carry the house for three days. |
Intervals vary with equipment, exposure and manufacturer. ANSI/ASHRAE/ACCA Standard 180 sets tasks and minimum intervals by equipment type; your own manuals govern your warranty. Check both against your plant rather than against this table.
Why does identical equipment last twice as long in one building?
Exposure explains part of it. Attention explains most of the rest. But the thing that decides it is whether anyone noticed in time — and noticing is a function of records, not of care.
The failure is almost never dramatic. It is a condenser that ran two summers at reduced capacity because the rinse interval slipped from quarterly to whenever somebody thought of it, and no one could say when the last one happened, because the man who did it worked for a company that no longer holds the contract. By the time the unit is short of capacity on a August afternoon, the damage is two years old and the conversation is about replacement.
We have written separately about why two identical units a mile apart have different service lives. The short version is that chloride does the work and nobody watches it happen. The longer version is that the buildings which get eighteen years out of a condenser are not the ones with better equipment. They are the ones where someone can tell you, without looking anything up, what was done to it and when.
The file
What belongs in a maintenance file?
Seven things. A folder of paid invoices is not a maintenance record — it is a record of payments, which is a different document answering a different question.
- An asset registerEvery unit by location, make, model, serial, install date, refrigerant type and charge. Yours, in a format you can carry to another contractor. A register held only inside a vendor's software is a register you do not own.
- Entries against a serial, not a building"Serviced the air conditioning" is not a record. "Unit 3, rooftop north, condenser rinsed and amp draw logged, 14 March" is. The serial is what makes a history comparable across years and across contractors.
- Readings logged so they can be comparedSuperheat, subcool, amp draw, temperature split. One set tells you almost nothing. The same figures across eight quarters tell you which compressor is going, months before it goes.
- Photographs, before and afterThe only part of a maintenance record that cannot be written up after the fact. A coil photographed in January and again in October is an argument that needs no explaining.
- Consumables with quantitiesFilter grade and count, belt sizes, pounds of refrigerant by type. This is also, incidentally, how an owner discovers they have been billed for filters that were never fitted.
- Recommendations, kept separate from work performedPriced and dated, in their own column. Mixed into the work log they are a sales document. Separated, they are a capital plan — and an answer when a board asks why a unit was replaced.
- Warranty and permit paperworkRegistration dates, serial-linked warranty terms, closed permits. These are the documents that cannot be reconstructed later, and the ones most reliably lost when a vendor changes.
The real question
Who is actually keeping this record?
On most properties, nobody — and not through neglect. The work is divided among six or ten companies, none of which can see the other nine, and none of which is paid to.
Count the vendors on an ordinary waterfront house: air conditioning, plumbing, electrical, irrigation, pool, landscaping, pest, generator, shutters. A mid-rise adds elevators, fire systems, a roofer and a backflow tester. Every one of them turns up, does competent work inside their own scope, and leaves behind an invoice. Not one of them holds anybody else's history, and not one of them has been asked to.
Questions nobody can answer
- When was the condenser last rinsed? Not serviced — rinsed. Those are different visits and usually different invoices.
- What grade of filter is in the units right now? And how many went in at the last change.
- Has the generator run under load this year? Or has it only ever started.
- Did March's valve work move a line under the equipment pad? The irrigation contractor knows. Nobody asked him.
- Which units are still under warranty? And did anyone register them inside the window.
- What did the last three technicians recommend? And was any of it ever done.
What the gap costs
- Warranties refused. Manufacturers generally require documented maintenance. An undocumented unit is, in practice, an uncovered unit.
- Claims argued down. After a water escape the adjuster's first question is what was done and when. "Regularly" is not an answer.
- Capital decisions made blind. Without readings over time, replace-or-repair is a guess dressed up as a judgement.
- Work paid for twice. Two vendors, overlapping scope, neither aware of the other.
- A full-time job nobody has. Tracking this properly across ten vendors is a person's work. Which is precisely why, on most properties, it is not tracked.
Seams
Where does a multi-vendor property actually fail?
At the seams. Rarely inside any one trade's scope — in the space between two of them, which appears in nobody's contract and therefore belongs to no one.
Water with two owners
A condensate line discharging into an irrigation bed. A backflow weeping onto a condenser pad. A pool-equipment leak tracking under a slab toward a panel. The air-conditioning contractor sees a draining pan. The irrigation contractor sees a working valve. Neither is wrong, and the corrosion is real.
Power with two owners
A generator started weekly and never loaded. A transfer switch exercised by nobody in particular. A pool heater added in 2019 to a circuit sized for what used to be there. Each installation was correct on its own day. The combination has never been reviewed by anyone.
Access with no owner
A locked roof hatch, a changed gate code, an equipment room stacked with patio furniture for the season. The visit gets logged as performed because a technician did attend. Three quarters later the coil has still not been touched, and the log says otherwise.
None of this is anybody's fault in a way you could usefully argue about. It is structural. Ten specialists optimising ten scopes will leave the gaps between them unattended, every time, unless somebody is paid to stand in those gaps and look.
Is it cheaper to use one contractor or a specialist for each trade?
Line by line, specialists usually win. Across five years, the comparison is not between two prices — it is between a set of invoices and a set of records, and only one of those is worth something when a compressor fails or a buyer's engineer walks the roof.
The honest case for specialists is real and worth stating: a pool man who does nothing but pools is better at pools. Nobody should pretend otherwise, and a property that is genuinely well run with ten vendors and one diligent manager keeping the file is in good shape. That arrangement exists. It is simply rarer than people think, because the keeping of the file is unpaid work that falls to whoever has the least excuse to refuse it.
What a single point of responsibility changes is not the quality of any individual trade. It is that one party has the whole picture, is accountable for the seams, and keeps the record when vendors turn over — which they do, constantly. The register survives the contractor. That is most of the value.
Our practice
How Amalfi holds this
What we will say about our own method is narrow and checkable, which is the only kind of claim worth printing.
- The survey comes before the scheduleWe walk the property and build the asset register first — every system located, photographed and recorded by serial. A maintenance schedule written before anyone has counted the equipment is a guess, and it is how units go unserviced for years without anyone noticing they were never on the list.
- Every entry sits against a serial and a dateNot against a building, not against a month. The history is comparable across years, and it reads the same whether you look at it or your next contractor does.
- One file covers every system, not only oursMechanical, irrigation, pool equipment, generator, shutters, the lot — including work performed by trades we did not send. If somebody else attended, it goes in the file, because a record with holes in it is not a record.
- We direct the licensed contractors who perform permitted workPermitted work is carried out by licensed, insured contractors under our direction and our coordination. What we are accountable for is the whole of it — the scheduling, the seams between trades, and the record.
- The file is yours and it leaves with youExportable, not locked in our software, and handed over without argument if you go elsewhere. A record you cannot take with you was never really yours, and a contractor who holds it hostage is telling you something.
The survey also produces something you can hold: a drawn plate of where every system, shutoff and access point actually is on your property, finished and framed for the equipment room. Not everyone keeps a set of plans at the house, and on the night a line lets go, a stranger with a torch should not be hunting for the water main.
Questions
Questions owners and managers ask
How often should a condenser be rinsed on the coast?
Quarterly is the usual starting point within sight of salt water, and closer to monthly on an exposed oceanfront roof. The variable is chloride deposition, not the calendar, so the honest answer comes from looking at the coil rather than from a schedule. What matters as much as the interval is that the rinse is recorded as its own event — it is frequently folded into a general service line, which makes it impossible to tell afterwards whether it happened.
Does skipping maintenance really void a manufacturer's warranty?
In practice the problem is less that cover is voided and more that a claim cannot be substantiated. Manufacturers generally condition warranty cover on maintenance performed to their published requirements, and the burden of showing it falls on the owner. An owner who cannot produce dated records against the serial is usually paying for the part. Read your own warranty terms, and keep the registration paperwork with the asset register.
What should I ask a contractor to hand over if I change vendors?
The asset register in an exportable format, the full service history by serial, photographs, logged readings, outstanding recommendations with dates, warranty registrations and copies of closed permits. Ask for all of it in writing at the point you sign, not at the point you leave. A contractor who will not commit to handing the record back is proposing to keep something that belongs to you.
We already have good vendors. Why change anything?
You may not need to. If someone on your side can tell you today when the condenser was last rinsed, which recommendations are outstanding, and which units are still in warranty, the system is working and the vendors are not the issue. If nobody can answer those three questions quickly, the gap is not in the trades — it is in the record, and it will keep costing money quietly until somebody owns it.
Enquiries
Send us last year's invoices
Whoever did the work. We will build the asset register from them and show you what is missing — the units nobody is servicing, the intervals that have slipped, and the paperwork that has gone astray. It obliges you to nothing.