Short answer
HVAC Google Ads usually fail for setup reasons, not market reasons. The big ones: broad keywords with no negatives, one campaign for every service, clicks sent to the homepage, no call tracking, ads running when nobody answers, and slow follow-up on leads. Fix those and the same budget books more jobs.
Most HVAC owners who say "Google Ads doesn't work for us" are right about the result and wrong about the cause. The channel works. The setup leaks. Here are the nine leaks we see most often, and the fix for each one.
1. Broad keywords with no negative list
Broad match lets Google show your ad for anything it thinks is related. For an HVAC company, "related" includes people looking for HVAC jobs, technician salaries, DIY repair videos, replacement parts and free advice. Every one of those clicks costs you money, and none of them books a service call.
The fix: build a negative keyword list before launch and keep adding to it. Start with obvious ones:
- Job seekers: jobs, hiring, salary, career, training, school, apprentice
- DIY: how to, diy, yourself, video, youtube, manual
- Parts buyers: parts, filter, wholesale, supply, amazon
- Bargain hunters you can't serve: free, cheap, coupon (only if you don't run promotions)
Then lean on phrase and exact match for your money keywords, like "ac repair near me" or "furnace not working".
2. One campaign for every service
AC repair, furnace replacement, maintenance plans and duct cleaning all go into one campaign with one budget. Google spends that budget wherever clicks come easiest, which is rarely where your best jobs are. You also can't see which service is making money.
The fix: split campaigns by service, at minimum repair, maintenance and duct cleaning. Each gets its own budget, its own ads and its own landing page. Now you can push spend toward the work that pays and pull it from what doesn't.
3. Sending every click to the homepage
Someone searches "emergency AC repair". They land on a homepage with a slider, a company history and six menu items. They have to work out whether you do what they need. Many don't bother. They hit back and call the next ad.
The fix: send each campaign to a page that matches the search. The AC repair ad goes to an AC repair page with the phone number at the top, your service area, reviews and a booking button. We cover what those pages need in our HVAC website design page.
4. Measuring clicks instead of booked jobs
If the account reports clicks, impressions and click-through rate, it is optimizing for the wrong thing. A cheap click from a renter who wants a free quote looks great on a dashboard and does nothing for revenue. Without call tracking, Google can't tell a booked $900 repair from a hang-up.
The fix: track calls and form fills as conversions, then mark which ones became booked jobs. Feed that back into Google Ads so its bidding learns what a good lead looks like. Judge the account on cost per booked job and return on ad spend. If you're unsure what a healthy number looks like, read what a good ROAS is for HVAC.
5. Running ads when nobody answers the phone
Ads run 24/7 by default. If your phones go to voicemail at 6pm, every evening click is a lead you paid for and then handed to a competitor who picks up. Emergency searchers don't leave messages. They call the next number.
The fix: set an ad schedule that matches the hours someone actually answers. If you offer after-hours service with a live person or answering service, keep those hours on and bid them up. If you don't, turn them off or switch to form-only ads at night.
6. Never reading the search terms report
The search terms report shows the exact phrases people typed before clicking your ad. It is the single best source of waste in most HVAC accounts, and many accounts go months without anyone opening it.
The fix: review it weekly in the first months, then every two weeks. Add every irrelevant term as a negative. Promote strong terms that convert into their own exact-match keywords. This one habit cuts wasted spend more than almost anything else on this list.
Quick check: open your search terms report for the last 30 days and sort by cost. If you see job searches, other brands, or cities you don't serve in the top 20, you've found money to recover this week.
7. Skipping ad assets
Ad assets (Google used to call them extensions) add a call button, your address, extra links and short selling points to your ad. Without them your ad is smaller than your competitors' and gives people fewer reasons to choose you.
The fix: set up at least these four:
- Call asset: a tap-to-call button on mobile, with your tracked number
- Location asset: links your Google Business Profile so your address and rating can show
- Sitelinks: links to AC repair, heating, maintenance plans and financing
- Callouts: short points like "Same-day service" or "Upfront pricing", only if they are true
8. A target area that's too wide
Many accounts target a 50-mile radius because "we'll drive anywhere". The result is ad spend in towns where your drive time kills the margin, your reviews mean less, and you rank behind the local shop. Google's default location setting can also show ads to people who are only interested in your area, not in it.
The fix: target the zip codes or cities where you want work and can get there fast. Set location options to "presence", meaning people in or regularly in your area. Raise bids in your most profitable zones and exclude the ones you'd rather not serve.
9. Slow follow-up on leads and estimates
This one isn't inside Google Ads, which is why it gets missed. A form lead that waits two hours for a callback has often already booked someone else. An estimate for a $1,200 job that never gets a follow-up call is revenue you paid for and left on the table.
The fix: call web leads back within minutes during business hours, not hours. Have a set follow-up for open estimates, such as a call the next day and a text two days later. Better ads can't make up for leads that never get worked.
How to tell which mistakes you're making
| Symptom | Likely mistake |
|---|---|
| Lots of clicks, few calls | Homepage landing page, wide target area, no negatives |
| Calls, but wrong kind of jobs | One campaign for every service, broad keywords |
| Can't say what ads made you | No call tracking, measuring clicks instead of jobs |
| Good leads, low close rate | Slow follow-up, ads running after hours |
Not sure how much to spend once the leaks are fixed? Our guide on HVAC Google Ads budgets walks through the math. And if you're deciding between Local Services Ads and search ads, read LSA vs Search Ads for HVAC.
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