Which ads sold systems, not service calls?

Most HVAC marketing is measured on call volume, and call volume is dominated by service work. Replacements are rarer, far larger, and often produced by different creative, different keywords and sometimes a different channel entirely.

Ranking channels by invoiced value separates them. It is common to find a campaign producing a third of the calls and most of the install revenue — and equally common to find a cheap lead source producing volume that never converts above a diagnostic fee.

An aging system gets quoted in October and replaced in March when it finally fails. Click attribution lost that connection months earlier; the ad platform closed its books on October and moved on.

Matching on the customer's phone number or email means the March invoice is credited to the October call. For a trade where a large share of replacement revenue is deferred, this routinely changes which channel looks profitable.

Heating and cooling demand is weather-driven, and the weather does not respect reporting periods. A homeowner gets a diagnostic in the first hot week of June, decides to nurse the system through the summer, and replaces it when it fails properly in August — or in the first cold snap of November.

That puts the campaign and the revenue in different months and frequently different seasons. Any measurement built on a window credits whichever branded search happened in the final week and scores the original campaign as a cost with no return.

Because the match is on the homeowner rather than a session, the gap is irrelevant. The person who called in June and the invoice raised in November are one match, and the June spend is credited with the November revenue.

A maintenance plan is worth a modest amount in its first year. What it is actually worth is the renewals, the priority service calls, and the replacement quoted by a technician who is already standing in the house and has the homeowner's trust.

Marketing reports value the first payment. Matching on the customer attaches every later invoice to the channel that produced them, which usually moves plan-generating channels up the ranking sharply.

It also lets you ask a question most contractors cannot currently answer: whether the channel that produces the most replacements is the same one that produces the customers who stay.

The revenue file is a list of completed jobs or invoices, one row each, carrying the customer's phone or email, the amount and a date. Almost every field service system exports this; it is the report the office already runs to reconcile the month. Business unit or job type is optional; mapped as Product / service, it is the breakdown most worth adding, because it is what separates service from replacement.

The second file is whatever your demand looks like. A Google Ads or Local Services export, a call tracking export, a list of inquiries from a home services marketplace. Any one of them is enough to start. Several can be combined into that one lead file, each row tagged with its source, and every source you add is one less row sitting in the unattributed bucket.

Nothing goes on your website, nothing connects to your field service software, and no permissions are granted. That is also why a period that has already finished works exactly as well as the current one — the records were kept for billing, not for tracking.