HVAC demand doesn't arrive evenly. In the Indianapolis area, "furnace repair" drew about 8,100 searches in January and about 1,000 in May, by Keyword Planner's monthly counts. Within a season it's lumpier still: the first 90-degree Monday or the first night below freezing brings a rush of calls all at once.
Google Ads is built for days like that. On a busy day it can spend up to twice the campaign's daily budget. That's allowed, it's in Google's own rules, and it surprises plenty of owners the first time it shows up on a statement.
It's one of several settings that come switched on, or set a certain way, when you create a Search campaign. Some of them help an HVAC account. Several don't, at least not at launch. This chapter goes through them in the order you'll meet them.
Google Can Charge Twice the Daily Budget on a Heat-Wave Day. The Month Still Stops at 30.4 Days' Worth.
The number you type into a campaign is an average daily budget, not a daily cap. Google says actual spend on any given day can exceed it by up to 2 times, which it calls overdelivery, meant to make up for slow days. The monthly ceiling is tighter: Google won't bill a campaign for more than 30.4 days of its budget in one month, whatever the weather does. Google's own example: $10 a day for a full month means at most $304.
For an HVAC shop, that rule cuts both ways. On the day the heat breaks records, a $100 daily budget can spend close to $200, which is often exactly when you want the phone ringing. On a quiet April Tuesday it may spend $40. The month evens out.
One change from June 1, 2026 is worth knowing if you run an ad schedule. If you switch whole days off, say Sundays, Google used to spend less across the month. Now it paces toward the full 30.4 times the daily budget across the days that do run, still never more than twice the budget on any one day, and never on a day you've switched off. Cutting Sundays no longer cuts the bill. It concentrates it.
Google's own example makes the size of the change clear. A campaign with a $100 daily budget that runs only 20 days a month used to pace toward about $2,000 for the month. Under the new rule it paces toward $3,040, the same as if it ran every day. If you schedule HVAC ads around office hours by switching days off, and you liked the lower monthly total, lower the daily budget instead.
So set the budget from the month backward. Decide what you can spend in a month on furnace and AC repair, divide by 30.4, and use that as the daily budget. If the month is $3,000, the daily budget is about $99. Start lower than that if you're new, low enough to see what clicks actually cost in your market before you scale. And when heating and cooling seasons need different money, give each its own campaign; Chapter 14 covers that.
Search Partners Come Switched On in Every New Search Campaign. An HVAC Account Launches With Them Off.
When you create a Search campaign, Google includes its search partners by default. Partner sites can show your ads alongside their own search results, on directory pages and on product pages, and that includes YouTube search results.
Some partner traffic is fine. Some of it, in our experience, is low-quality, and some is outright bot clicks, and a brand-new account has no conversion history to tell the two apart. At launch, an HVAC account should spend every dollar on Google Search itself, where a homeowner typed "furnace repair" into Google. Turn search partners off.
Once the account is booking jobs at a cost you understand, test partners again on purpose: switch them on in one campaign, watch the cost per booked job for a few weeks, and keep them only if it holds. Google Ads can split a campaign's results by network, so the partner clicks and calls show up on their own line next to Google Search. Compare booked jobs, not clicks. A cheap click that never calls is the most expensive kind.
The same goes for the Display Network option in a Search campaign. Display ads appear on websites and apps where nobody searched for anything. That reach can be useful for building awareness, but it has its place later in the rollout (Chapter 11), not inside the campaign built for people with a broken furnace.
A Furnace Ad Shown to Someone Who Only Read About Your City Rarely Books a Visit. Set Locations to Presence.
Location targeting has an advanced setting most owners never open. Left alone, it reaches three groups: people standing in your service area, people who spend a lot of time there, and people elsewhere who have looked into it. The tighter option, which Google calls Presence, reaches people in or regularly in your locations.
For a service business that drives to the customer, Presence is the right starting point. Someone in Phoenix reading about Indianapolis neighborhoods is showing interest in your city. They don't need your truck. Set the locations to the area your trucks actually cover, by county, city or a radius around the shop, and set the option to Presence.
Your website usually already has the list. One franchise location in our Indianapolis sample names about 150 Indiana communities it serves; smaller shops list their own handful of suburbs. Target those places, not the whole metro by default, and leave out the far edge where a two-hour round trip can turn a $400 repair into a thin job.
There's one real exception in HVAC: the adult son or daughter in another state arranging a furnace repair for a parent in your town. If your calls show that happening, it's worth testing a broader setting later in its own campaign. It's rarely the place to start.
Languages belong in the same pass. Most HVAC accounts run in English. If your service area includes many Spanish speakers and your office can take calls in Spanish, run Spanish ads as well, and make sure someone on the phone can actually help.
New Search Campaigns Arrive With AI Max Already On. An Exact-Match HVAC Launch Turns It Off.
This one is new enough that many guides haven't caught up. Google's own setup page for AI Max now states that a brand-new Search campaign comes with it switched on.
AI Max is a layer of automation inside a Search campaign. One of its main features, search term matching, uses broad match along with your ads and landing pages to reach searches beyond your keywords. Another, text customization, writes extra headlines and descriptions for you from your website. You may remember text customization by its old name, automatically created assets. From September 2026, any campaign with it switched on moves into AI Max.
None of that belongs in an account's first stage. Isolation, from Chapter 6, is exact match on the furnace and AC searches you can name, with ads you wrote from your own reviews in Chapter 8. AI Max would quietly turn that into a broad-match campaign writing its own copy. When you build the furnace and AC campaign, uncheck AI Max, leave text customization unchecked, and leave the broad match switch at the campaign level alone.
It earns a spot in the account eventually, as the last step, after broad match has proven itself on booked HVAC jobs (Chapter 13). Not on day one.
Without Auto-Tagging and Call Reporting, an HVAC Account Can't Tell You Which Ad Made the Phone Ring.
The last group of settings decides what the account can learn.
Auto-tagging. With it on, every ad click carries a click identifier, the GCLID, onto your website. That ID is what lets Chapter 1's paid-job uploads match a finished furnace repair back to the click that started it. Confirm the switch is on, and if your booking page redirects, test that the GCLID survives the hop.
Call reporting. Most HVAC jobs start with a phone call. Call reporting puts a Google forwarding number on your call assets, location assets and call ads, so Google can count the calls and how long they lasted. Google notes you can turn it off to show your own number or run third-party call tracking instead, and plenty of HVAC companies do: at least 6 of the 12 sites in our sample swap in tracking numbers of some kind. Either route works. What doesn't work is two systems counting the same call twice, so choose one and set the conversion counting in Chapter 1 to match.
Call recording. With call recording on, Google can use AI-qualified call leads, which listen for signs of a real customer, such as a booked appointment, and count only those calls as conversions. Google holds recording back from businesses it classes as healthcare or financial services; an HVAC company is neither, so the option is open. Check your state's call recording rules before you switch it on.
Ad rotation. Choose "Optimize." Google then leans toward whichever furnace or AC ad its signals say will do better in that particular auction. Once the account moves to Smart Bidding, Google uses Optimize automatically.
Your brand. Searches for your own company name get their own small campaign, so they don't make the furnace repair numbers look better than they are. A homeowner who types your name already chose you, and those calls would flatter any campaign they landed in.
Next: Performance Max Can't Tell a Furnace Install From a Drain Clog. Wait Until the Account Can.
Your campaign is ready to launch: a daily budget set from the month, search partners and Display off, locations on Presence, AI Max off, and tracking that can follow a click to a paid job. Chapter 8 wrote the ads, Chapter 7 set the bids, Chapter 6 the two stages, Chapter 5 the keywords, Chapter 4 the ad groups, Chapter 3 the job values, Chapter 2 the order to buy searches in, and Chapter 1 the tracking. Chapter 10 covers Performance Max, and why it waits.
The full rollout, from tracking to seasonal budgets, maintenance plans and new-system ads, is on the guide's home page.
When we launch HVAC accounts through our Google Ads management, every one of these settings is checked on the day the campaign goes live and again a week later, because Google's defaults and upgrades keep changing. Launching your own? Open your campaign's settings tab today and check four things: networks, location options, AI Max and auto-tagging.
