Retention & Reminders for Air Conditioning Engineers
You’ve already installed your own customer base. Most of it isn’t calling you back.
The install is the smaller half
An office cassette system is £10,200. A multi-split, £4,840. A multi-room system, £2,600. A single split, £1,202.
Then a service and gas top-up is £255.
That £255 looks like the afterthought. Run it out ten years and it isn’t — and unlike the install, it repeats without you having to win anything.
There’s a specific reason it repeats in your trade: systems containing refrigerant have to be checked on a cycle, and the frequency depends on the charge. That’s not a nice-to-have your client can defer indefinitely. It’s an obligation attached to equipment you personally installed.
So every system you’ve ever commissioned is a customer with a recurring requirement and your name on the unit. The question is whether you’re the one who contacts them, or whether it’s the maintenance company that sent a letter first.
Most AC engineers lose a substantial share of this quietly. Not to a better competitor — to a summer where they were flat out fixing breakdowns and never got round to the servicing calls.
What this service actually does
Every system on record with its schedule. Site, unit type, refrigerant, charge, install date, next check due. That’s your compliance obligation as much as your revenue.
Reminders that go out automatically, in spring. Timing matters enormously here. A service booked in April is a comfortable job. The same customer in July, when their office is 30 degrees and their system has failed, is an emergency call-out and a bad experience for both of you.
Certificates and records delivered same-day. Commercial clients need these for their own compliance files.
Breakdown history against the unit, so you know which sites are heading for replacement — that’s your £10,200 pipeline.
Alerts when a site goes quiet, before you’ve lost the account entirely.
What we’d actually build
The system register first — everything you’ve installed or maintain, with equipment detail and schedule.
Then spring-weighted reminders, deliberately timed to move servicing out of the summer crush and into the quiet months. That’s better for your margin, your staffing and your customers, and it’s the single biggest operational change most AC companies could make.
Then automatic certificate delivery, because commercial clients file these and remember who made it easy.
Then the replacement pipeline — units logged with age and fault history, so when something is clearly near end of life you’re the one having the planned conversation rather than the emergency one.
Then churn alerting on sites that have skipped a cycle.
What it costs against what it returns
Worth putting side by side, because the ratio is not close.
Booked is £99 a month — £1,188 a year.
A single office cassette system is £10,200. One recovered install job covers the marketing for eight years. But that’s not even the main argument, because installs are the volatile part of your business.
The recurring side is where this pays. Ninety-nine lapsed service customers at £255 is £25,245 a year — twenty-one times the cost, from customers whose kit you already installed and whose addresses you already have. You’re not buying leads. You’re recovering revenue that’s already yours.
Then there’s the compounding. Every service customer you keep is £255 a year for as long as that system runs, which for commercial kit is often a decade or more. A customer retained isn’t worth £255, they’re worth £2,550. And every one of those relationships is where the £10,200 replacement job comes from when the kit finally gives up — nobody re-equips an office with a company they’ve never met.
The one thing that breaks this maths is doing nothing. An installed base you don’t contact quietly becomes somebody else’s maintenance contract, one site at a time, and you find out years later.
What good looks like
70% or more of servicing done outside June to August. That’s the operational win and it’s achievable within one year.
Rebooking rate above 80% on systems you’ve installed.
Certificates out within 24 hours.
A known replacement pipeline — you should be able to name the sites likely to need new kit in the next two years.
The mistakes we see most
Servicing crammed into summer. You’re doing planned work during your emergency season, badly, and turning down call-outs to do it.
No register of installed systems. You’ve built a customer base and lost the list.
Only contacting customers when something breaks. That’s a supplier relationship, not a maintenance one.
Not tracking fault history. Your replacement pipeline is in engineers’ heads.
Losing commercial sites at handover. Facilities staff change; automatic reminders survive that, personal relationships don’t.
What’s your installed base worth?
Systems installed 220 · annual service £255 · currently servicing 55%
You’re servicing 121. The other 99 are worth £25,245 a year.
This is what Gaffer was built for
Every system on record with equipment detail and schedule. Reminders fire automatically, weighted to spring. Certificates generate and send same-day. Fault history builds against each unit, which is your replacement pipeline. Recurring invoicing handles the contracts.
Questions AC engineers ask
Summer is when we make our money.
On breakdowns, yes. Which is exactly why servicing shouldn’t be competing for the same weeks.
Our commercial clients have their own systems.
The good ones do. The reminder still needs to come from someone, and if it comes from you it’s your contract.
What about domestic?
Lower value and less regulated, but the same principle applies — a domestic split system still needs servicing and almost nobody gets contacted.
Is this just a spreadsheet?
It’s a spreadsheet that sends the emails, generates the certificates and tells you who’s drifted. That’s the difference, and it’s the difference between 55% of your base servicing and 85%.
How far back should we go?
Everything you’ve ever installed. Even systems from eight years ago are worth contacting — the kit is still there, it still needs servicing, and whoever installed it has the strongest claim to look after it.
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