Two calls come in on the same July morning from the same ad. The first homeowner needs a capacitor swapped so the condenser will start again. The second wants an estimate on a whole new air conditioner because the old one, at nineteen years, finally gave up for good.
Google charged you about the same for both clicks. The invoices behind them could differ by thousands of dollars. That gap is the whole subject of this chapter: an HVAC click isn't worth an average. It's worth whatever job it turns into, and your budget should be priced that way.
The numbers below come from published industry data, every figure labeled with who published it. Your own numbers will differ by market and by shop. The math works the same everywhere, which is the point of learning it now, before Chapter 1's tracking starts handing you real figures of your own.
The Math From Click to Customer Has Six Links. Most HVAC Shops Only Watch the First One.
Ask an HVAC owner what their Google Ads cost and the answer is usually a click price or a monthly spend. Both are the first link of a longer chain:
- Cost per click: what one tap on your ad costs you.
- Conversion rate: the share of clicks that turn into a call, form or booking.
- Cost per lead: the first two combined, what one call or form costs you.
- Booking and close rate: how many leads land on the schedule, and how many of those pay.
- Cost per customer: what you spent in ads for each paying job.
- Customer value: what that customer pays you, on this job and later.
A cheap click with a poor booking rate can cost more per customer than an expensive click that books. A costly lead can still be a bargain if the job behind it is a new system. Watching only the click price is like judging a furnace by the paint on the cabinet.
Every link has a home in your own records. Google Ads reports the first three: average cost per click, conversion rate and cost per conversion, by campaign and keyword. Your dispatch software holds the fourth, because it knows which calls became appointments and which appointments became invoices. The invoices hold the fifth and sixth. Most shops already have all six numbers. They just live in three places that never meet.
In One Contractor Ad Platform's Data, a Booked HVAC Job Cost About $550. The Average Ticket Was About $3,100.
SearchLight, which tracks ad results for HVAC and plumbing contractors, published service-line numbers from January 2026 covering 816 of those contractors and $14.9 million in Google Ads spend. For general, non-branded HVAC searches it reported $198 per lead and a 36.0% book rate. Divide the lead cost by the booking rate and one booked HVAC job cost about $550 in ads. The average ticket on those jobs was $3,102.
That is one vendor's data, and it has a commercial interest in the result, so treat it as a reference point, not a benchmark. Another vendor measures differently. LocaliQ's search benchmarks for home services, covering April 2024 to March 2025, put the average cost per lead at $127.74 for air conditioning installation and repair and $129.02 for heating and furnaces, with conversion rates of 6.56% and 7.48%.
The two sources don't agree, and they shouldn't be blended. They track different accounts, different years and different definitions of a lead. What they share is the shape of the problem: a lead costs well over a hundred dollars, and a lead is not yet a paying job.
An AC Install Lead Costs Less Than a Repair Lead. Fewer of Them Book, and the Ones That Close Pay Thousands.
The same SearchLight data splits HVAC by service line, and the split cuts against intuition. An AC repair lead cost $231. An AC installation lead cost $157, cheaper, but only 24.2% of install leads booked an appointment.
Run the install chain:
- $157 per lead, divided by a 24.2% booking rate, is about $649 per booked estimate.
- Your close rate does the rest. ACHR News reported in February 2026 that contractors in its survey close 43% of their install jobs. At that rate, about $1,509 in ads buys one sold system.
- Angi's cost guide puts the national average for a new central air conditioner at $5,978.
The close rate moves this math more than any bid. The same ACHR News survey reported that its contractors closed 38% of installs without offering financing and 49% when they did. Run the chain at each rate and the ad cost per sold system swings from about $1,708 to about $1,324, from the same $157 lead.
A $1,509 ad cost against a sale near $6,000 is a very different business from a $1,509 ad cost against a repair call. That is why install searches deserve their own budget, their own bids and their own page. An install lead should land on a page about replacements, with options and financing, not on a home page built for broken-down units. Chapter 4 builds those pages.
The First $400 Repair Can Cost More to Win Than It Brings In. What Comes After It Pays the Difference.
Cost guides put the typical AC repair around $400: "Most homeowners pay $417," HomeAdvisor says, and Forbes quotes an average of $400.
Now take SearchLight's $231 AC repair lead. The data has no repair-specific booking rate, so treat this as an "if": if one repair lead in three books, the ads behind each booked repair come to about $690. That is more than the repair itself brings in, before parts, labor and the truck.
That isn't a reason to stop buying repair searches. It's a reason to price them on what the repair customer does next:
- A maintenance plan. Plan prices we found on the example HVAC sites run from $12 a month for a basic tier to $45 for the top one; seven of the twelve publish them. HomeGuide's cost guide puts annual plans at $120 to $360.
- The next system. The household that called for a capacitor this summer will need a whole system someday, and it will call whoever earned its trust.
- The neighbors. Reviews do selling you never pay for. In the reviews we read, 122 four- and five-star reviews praised a tech for explaining the problem, offering options or skipping the pressure. Meanwhile, in 29 of the 63 low-star complaints about pressure to replace, a second company fixed the problem for less, and that second company got the review.
How much a repair customer is worth over the years is our reading, not a published number. Nobody has measured it for the whole industry. But an account that prices every repair click on the first invoice alone will underbid the very searches that fill its plan roster and its install calendar.
Every Call Your Office Misses Raises What the Booked Jobs Cost.
The booking rate is the link you control most, and it lives at the front desk. ServiceTitan, which runs dispatch software for HVAC and other trades, reported from its 2022 data that HVAC shops booked 38% of calls, against 42% for a typical shop across trades.
Four points sounds small. On the chain, it isn't. Every call that doesn't book is a lead you already paid for, and its cost spreads across the jobs that did book. The customer reviews show where the leaks are: of 221 low-star reviews about a heating or cooling job, 64 were about a no-show, a long wait for a tech or a callback that never came.
The fixes are unglamorous and cheap next to the ad spend: someone who answers during the hours your ads run, a call-back rule for missed calls measured in minutes, and a reason recorded for every call that doesn't book. Chapter 9 lines up the ad schedule with the hours your phone is actually answered.
Ads can't fix an unanswered phone. They make an unanswered phone more expensive.
The Right Starting Budget Comes From the Jobs You Want to Book, Not From Google's Suggestion.
Google will offer to set a budget for you. Its suggestion knows the auction, not your margins. Yours should be built backward from the jobs you want.
Start from the mix. Decide how many repair calls, maintenance plans and system sales you want from ads in a month. Then work each one back through the chain with your own numbers: what a sold job is worth to you, what your office books and closes, and the cost per lead you can afford at those rates. That ceiling is your real starting budget, not the round number Google suggests.
Here is the shape of it, using this chapter's figures as stand-ins for your own. Say you want four sold systems a month from ads. At about $1,509 in ads per sold system, that is roughly $6,000 a month for the install campaign alone, before a single repair search. If that number is out of reach, the answer is a smaller target or a better close rate, not a smaller budget spread across the same goal.
Start low enough to read the bids before committing the full amount. Keyword Planner's estimates are a forecast. The first few weeks of real clicks are the measurement. Chapter 9 covers how Google paces a daily budget, including the days it spends more than you set.
Then let the tracking from Chapter 1 correct you. After a month, you will know your real cost per booked job by service line, and the estimates in this chapter can be retired for your own.
Next: Homeowners Search "AC Repair" Five Times More Than "HVAC Repair."
You know what a repair and a new system are worth, and how much each can afford to pay for a click. Chapter 2 showed which searches to buy first, and Chapter 1 set up the tracking that reports what each job paid. Chapter 4 builds ad groups and pages in the words homeowners actually type.
The whole sixteen-chapter rollout, from tracking to seasonal budgets, maintenance plans and new-system ads, is on the guide's home page.
In the HVAC accounts we handle through our Google Ads management, budgets start from the job mix the owner wants, not from a round number. Building your own? Divide last month's ad spend by the jobs it booked, and you will have the most useful number in your account.
