HVAC Google Ads: Buy the Shoulder, Harvest the Peak

Most HVAC Google Ads advice tells you to raise your budget in July. We think that is close to backwards.

The first week of a heat wave is when clicks cost the most, when every competitor within forty miles is bidding, and when a large share of the calls you pay for would have found you anyway or will be booked nine days out and cancelled. It is the least incremental traffic you will buy all year, at the highest price you will pay all year.

The cheap, genuinely incremental month is April. Your calendar has gaps, your competitors have pulled back, and the customer you sign is not a one-off repair. They are a maintenance agreement, which is the thing that makes next July profitable without an auction.

So run the year the other way round. Buy the shoulder, harvest the peak.

Why a peak lead is worth less than it costs

Incrementality is the word nobody uses in home services advertising and it decides everything here.

A lead is incremental if you would not have got that job without paying for it. In the middle of a July heat wave, three things reduce incrementality at once:

None of that means switch off in summer. Emergency demand is real and margins on a same-day repair are good. It means stop treating peak spend as your growth lever, because it mostly is not one.

Three cards explaining why an HVAC lead bought during a heat wave is less incremental: existing demand you would have captured anyway, jobs you cannot service in time, and every competitor bidding on the same forecast.

Price a peak lead against your actual capacity

Do this with your own figures. It usually changes what the summer budget is for.

Illustrative, so substitute yours:

The last row is the one nobody calculates. In April, $133 buys a call you can serve, from somebody who did not otherwise know you existed. In July, $173 buys a call you might not be able to serve, from somebody who may well have found you through the map pack twenty seconds later.

More than three times the price for the same job. And the July version arrives when your technicians are already at capacity, which means the true cost includes the overtime or the lost install you displaced.

The budget calculator will run the forward version of this if you want to test a few splits across the year.

A side by side comparison of an April and a July HVAC lead, showing $133 versus $173 per call but $175 versus $571 per incremental booked job once capacity and existing demand are accounted for.

Run the year backwards

Here is the calendar we would build for a residential HVAC company in a market with a real summer and a real winter.

Two things about that table that will look wrong at first.

Your biggest spending months are the shoulders, not the peaks. That is deliberate. Shoulder clicks cost less, your calendar can absorb the work, and the lead you buy converts into a recurring relationship rather than a single invoice.

And your peak budget is capped rather than uncapped. In a heat wave the constraint is technician hours, not demand, so an uncapped budget just buys you a longer list of people you will disappoint.

A four-season calendar for an HVAC Google Ads account showing what to buy, what to measure and what budget posture to hold from March through February.

What you are really buying in April is the agreement

A tune-up at $89 is not a profitable job. It is a customer acquisition cost with a service van attached, and the return is the maintenance agreement.

The arithmetic is not subtle. A plan customer calls you first when the unit fails, which means you get the July emergency without entering the July auction. They stay on the books for years. They are dramatically more likely to buy the replacement system from you when the unit finally dies, and the replacement is where the real money in this trade sits.

So in the shoulder season, judge the account on plan signups rather than on the revenue of the jobs it produced. If April's ads look unprofitable on same-month revenue and produced 40 new plan customers, April was your best month.

This is also why an agency that has never run HVAC will underbid you into irrelevance. A generalist looks at an $89 tune-up and caps the cost per lead at $40. Somebody who knows the plan retains for four years and carries a replacement quote at the end of it will pay four times that and be right. Industry context is a bidding advantage, not a nice-to-have.

Two cards contrasting an $89 tune-up treated as a job against the same tune-up treated as the acquisition cost of a maintenance agreement, with the plan renewal and system replacement that follow.

Do not use seasonality adjustments for your season

This one is a straight correction to advice you will read everywhere, including from people who should know better.

Seasonality adjustments look like the obvious tool for a seasonal trade. They are not. Google describes them as an advanced tool for informing Smart Bidding of expected conversion rate changes for future events like promotions or sales, says in Google's seasonality guidance that they are best used for short events of one to seven days, warns they may not work as well over more than 14 days at a time, and states plainly that Smart Bidding already manages seasonal events.

Your cooling season is not an event. It is three months, and the bidding already knows about it from your own conversion history.

Where the tool genuinely fits in this trade is much narrower:

Everything else should be handled with budget, targets and campaign structure. If your summer plan is a permanent plus 30 percent seasonality adjustment, you are using an event tool as a settings tool and telling the algorithm something it already knew.

Three cards showing the narrow cases where Google Ads seasonality adjustments genuinely apply to an HVAC account: a three day heat emergency, a weekend replacement promotion, and the first cold snap.

What to do when you are booked solid

Every HVAC company hits the week where the schedule is full and the phone is still ringing. Most either keep spending and annoy people, or switch everything off. There is a better third option.

Shift spend from repair to replacement. A homeowner whose fifteen year old system just failed in a heat wave is the most motivated replacement buyer you will ever meet. That job is worth many times a repair, it books further out without complaint, and it is exactly the demand your competitors are too busy to chase.

Use ad scheduling rather than pausing. Run during the hours you can actually answer. An unanswered call in this trade is not neutral, it is negative, and if you are running Local Services Ads it is worse than that: Google states that if you regularly fail to answer calls or respond to messages, your ad ranking may be affected, per the Local Services Ads guide.

Raise your price before you cut your budget. If demand exceeds capacity, that is a pricing signal. Most owners will pause ads for a week before they will add ten percent to a diagnostic fee, which is the wrong order.

Never let the emergency campaign go to voicemail. If nobody is answering after 6pm, schedule the campaign to stop at 6pm. Paying peak prices to reach an answering machine is the single most expensive habit in seasonal home services.

Four numbered cards on what to do when an HVAC company is booked solid: shift spend to replacement, use ad scheduling instead of pausing, raise price before cutting budget, and never run emergency ads into voicemail.

Measure calls and booked jobs, not clicks

The reporting that matters in this trade is short. Cost per booked job, booking lead time, and plan signups. Everything else is context.

Booking lead time is the underrated one. If the gap between call and appointment stretches past three days, your conversion from call to completed job is falling whether or not the ads account shows it, and more budget makes it worse rather than better.

We have run this pattern with several local service clients and the shape repeats: a phone repair shop reaching 115+ monthly phone calls in seven months, a real estate office 90+ in seven, a junk removal company 50+ in six. None had meaningful inbound calls before the work started. In every case the number that told us it was working was calls answered and jobs booked, not impressions or click-through rate.

If you want the keyword-level version of this, including what your competitors are actually bidding on, that is covered in HVAC competitor keywords. And Local Services Ads are worth running alongside search in this category rather than instead of it, because the pay-per-lead model and the verified badge behave differently in an emergency search.

An HVAC technician in uniform working outside a building.

When an HVAC company should not run Google Ads

Three honest situations, and we turn away work in all of them.

Nobody answers the phone after hours during the season. In emergency HVAC the caller is trying three companies in eight minutes. If you are not answering, you are funding your competitors' close rate. Fix the answering before the advertising.

You are already at capacity year round. Some established companies genuinely are. If your problem is technicians rather than customers, the marketing budget is better spent on recruiting, and the ads will only inflate a waiting list you are already apologizing for.

You have no maintenance plan to sell. Without a recurring product, shoulder-season advertising has nothing to convert into and you are left buying only peak emergency traffic, which is the expensive half of the year. Build the plan first, then advertise into it.

A wall-mounted air conditioning unit displaying a set temperature.

FAQs

Buy the shoulder, harvest the peak

If you take one idea from this: your ads are most valuable when your calendar has gaps and your competitors have gone quiet, which is exactly when most HVAC companies cut their budget.

So put your biggest spend in March through May and September through October, sell maintenance agreements with it, and judge those months on plan signups rather than same-month revenue. Then cap the summer at what your technicians can genuinely absorb, run emergency campaigns only when somebody answers the phone, and leave the seasonality adjustments alone.

The July auction will still be there. You just will not need as much of it.

If you want this built and run against booked jobs rather than clicks, our HVAC marketing team does this work, and our PPC management is month to month with no lock-in.