A condenser fan motor quits on a three-year-old unit. Your tech quotes the part and the labor, the customer says go ahead, and the truck rolls to the next call. Two months later a manufacturer rep mentions that motor carried a five-year parts warranty, and it lands on you: you just bought a part somebody else would have covered. Nobody did anything wrong. The coverage question just never came up.
That's the quiet leak in a lot of field-service shops. It doesn't show up as a line item anywhere, because the loss is a claim you never filed. A few of these a month and you're eating real money, parts and sometimes labor, on work that was covered the whole time.
There are actually two warranties in play on most repairs, and both get missed. One is the manufacturer's coverage on the equipment. The other is your own workmanship promise on a repair you did earlier. Checking both before you quote a dime is a five-minute habit that pays for itself the first time it catches one.
Two warranties, two clocks
The manufacturer warranty rides with the equipment. Most HVAC parts carry five or ten years on the part itself, sometimes longer on a compressor or heat exchanger, usually only if the unit got registered within 60 or 90 days of install. Labor is almost never included, which matters (more on that below).
Your workmanship warranty is the one you gave the customer. If you replaced that same motor eight months ago and it failed again, that's on your window, not theirs. Quoting it as a fresh paid repair isn't just a lost claim, it's a callback you're charging for, and customers remember that longer than they remember a delay.
Both have a clock. The only way to check the clock is to know the install date and the model, and that's exactly the piece that goes missing when a call comes in hot and the tech just wants to get rolling.
Build a coverage log you can actually check
You don't need software for this. You need one place that answers a single question fast: did we touch this address, and what's still covered?
Keep a running log of every install and major repair you do. A shared spreadsheet works fine to start. For each job, capture:
- Address and customer name, so dispatch can find it by either.
- Equipment brand, model, and serial, the part that unlocks any manufacturer lookup.
- Install or repair date, the clock for both warranties.
- What you did, in plain words (replaced condenser fan motor, swapped capacitor).
- Warranty terms: manufacturer coverage length, whether it was registered, and your own workmanship window on that repair.
The point isn't a perfect database. It's that when the same address calls, somebody can check in thirty seconds whether the truck is rolling toward a claim or a paid job. Once the log has a year of history in it, this is where a little automation earns its keep: a lookup that matches the incoming address against past jobs and flags anything with an open window, so the human isn't scrolling rows during a heat wave.
Add one step to dispatch, before the truck rolls
The habit that saves the money is small. Before a repair gets quoted, dispatch runs the address and the equipment against the log and the manufacturer's registration lookup. Green light or red flag, then the tech quotes accordingly.
A simple flow:
- Call comes in. Grab address, brand, model, and rough age of the unit.
- Check the coverage log for prior work at that address, and check your workmanship window.
- Run the model and serial through the manufacturer's warranty lookup for parts coverage and registration status.
- Mark the ticket in-warranty or customer-pay before it hits the tech's queue.
- If it's covered, note what the claim needs (serial photo, failed-part return, registration proof) so the tech collects it on site.
That last one matters more than it looks. Most warranty claims die not because the part wasn't covered but because nobody grabbed the old part or the serial photo, and you can't go back for it once the unit's buttoned up and the truck's on the Loop.
When it isn't your install, send the quick text
Plenty of covered units were put in by somebody else, so your log won't have them. That's where a short confirmation text before the visit does the work. You're after two things: the model number off the data plate and the install date.
Something like: "Before we head out, can you send a photo of the label on the outdoor unit and let us know roughly when it was installed? Lets us check if the part's still under the maker's warranty before we quote you." Customers answer that one fast, because it might save them money, and it saves you a claim you'd otherwise miss.
If they don't know the install date, the serial usually does. Most manufacturers encode the build date in the serial, and their warranty lookup will tell you the coverage end date outright. Get the photo and you're most of the way there.
Be honest about what warranty won't cover
Coverage isn't a magic word, and quoting like it is will burn you the other direction. A few limits worth saying out loud to the customer up front:
- Labor usually isn't covered. The part comes free, the hours don't. Say so, or the customer thinks the whole visit's on the house.
- Registration lapses void a lot of it. An unregistered unit often drops from ten years to five, or to the base warranty. Check status, don't assume.
- Freight and diagnostic may fall on you or them. Know your distributor's terms before you promise anything.
- Neglect and off-brand parts void claims. A clogged, never-serviced unit can get a claim denied, and that's a conversation to have before you file, not after.
Saying the limits out loud does two things. It keeps you from quoting a "free" fix that isn't, and it makes the customer trust the times you tell them it really is covered.
Worth doing this week
Start small and let it build:
- Open one spreadsheet and back-fill your last three months of installs and major repairs, with model, serial, date, and warranty terms.
- Add a single dispatch rule: no repair gets quoted until somebody checks the log and the manufacturer lookup.
- Write the two-line confirmation text and save it where whoever books the call can paste it.
- Bookmark the warranty-lookup pages for the three brands you see most.
- Tell your techs to photograph the data plate and keep the failed part on any unit that might be covered.
None of this is fancy. It's a log, a flag, and a text, and it turns write-offs back into claims you actually file. If you'd like a hand wiring the address lookup and the flag into the way you already dispatch, that's the kind of quiet automation we set up for Houston shops at AI Agency Houston.