Why is my Performance Max campaign not converting for HVAC?

Performance Max defaults to low-quality inventory: parked domains, made-for-advertising sites, mobile-game SDK networks, low-quality YouTube content. The bidder optimizes against ghost conversions on those surfaces and spend pours in without producing booked jobs. The fix is six configuration changes: placement-quality negatives, asset-group discipline by service line, conversion-tracking accuracy, audience signal seeding, value rules, and brand keyword exclusion.

Should HVAC contractors use Performance Max or stick with Search?

Both, configured separately. Search captures intent-driven queries where the user already knows what they want (AC repair, furnace replacement). Performance Max extends reach into research-mode audiences, remarketing, and high-intent placements across YouTube and Discover. The mistake is running PMax in default configuration; that produces the failure pattern in this page. The right setup is PMax with all 6 fixes applied, running alongside a tightly-managed Search campaign that owns the brand and high-intent service queries.

How do I add placement exclusions in Performance Max?

PMax does not expose placement exclusions in the standard campaign settings. The path: Tools and Settings > Shared Library > Exclusion Lists > Placement Exclusions. Create an account-level exclusion list, add domain entries, then apply the list to your PMax campaigns. Source the bottom 50 percent of placements from PMax > Insights > Placements (or the API). Re-pull and re-exclude monthly.

Why is my Performance Max cost per conversion lower than Search?

Almost certainly a sign of attribution drift, not real outperformance. PMax often inherits conversion credit from Display and YouTube touches that did not produce the booking; the surface diversity dilutes attribution accuracy. Cross-check by comparing booked-job count against PMax-reported conversions over a 60-day window. If reported conversions are rising and bookings are flat, PMax is converting on ghosts. Apply the placement-quality fix from the checklist above.

How long does it take Performance Max to recover after the fix?

30-60-90 day shape. Days 1-30: spend rebalances away from the now-excluded low-quality placements; conversion rate (real conversions) starts climbing. Days 30-60: bidder learns the new conversion distribution; cost per booked job drops as junk-inventory spend evaporates. Days 60-90: stable steady-state at the new ROAS floor. If the fix is paired with conversion-tracking accuracy work, expect the recovery curve to be steeper because the bidder is now optimizing on complete signal.

HVAC Google Ads resource

Performance Max not converting for HVAC? Start with placement quality.

Performance Max defaults to junk inventory on HVAC accounts. Parked domains, made-for-advertising sites, mobile-game SDK networks, low-quality YouTube content. Budget pours in, ghost conversions tick up, real bookings do not move. The fix is not 'turn on PMax and wait'; it is 6 specific configuration changes that force PMax onto inventory that actually converts. Most accounts get back above-baseline ROAS within 30 days of the placement-quality fix.

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Quick answers

Why Performance Max stops converting on HVAC accounts

Performance Max is a single auction product spanning Search, Display, YouTube, Discovery, and Gmail. Google's bidder optimizes against your conversion data and shifts spend toward whichever surface is producing conversions cheapest. The failure mode is structural: cheap conversions almost always come from cheap inventory, and cheap inventory in 2026 means parked domains, made-for-advertising (MFA) sites, mobile-game SDK networks, and low-quality YouTube content. The bidder counts those as conversions because the conversion event fired; the bookings do not show up because the people on those surfaces were never going to call you.

Three signals that PMax is in this state: (1) PMax campaign reports rising conversions month-over-month while your booked-job count is flat or down; (2) PMax cost per conversion is suspiciously low (under your search-campaign average) when the surface mix should mathematically be higher; (3) PMax placement report shows app installs from games, parked-domain network names, or generic MFA domains as top spend recipients.

The fix is not 'pause PMax.' PMax does work for HVAC when configured correctly; the problem is that 'correctly' requires 6 specific setup steps that the default wizard does not walk you through. The checklist below covers them.

The fix

The 6-step PMax fix for HVAC

Run these in order. Each step is independent of the others, so you can land them across two or three sessions. Most HVAC accounts need all six.

Placement-quality negatives. Pull PMax > Insights > Placements (or the Placement Report API). Identify the bottom 50 percent by quality: parked domains, MFA-named sites, mobile-game app IDs, generic content farms. Add them to the account-level placement exclusion list. Repeat monthly. The default placement exclusion list is empty; this is the single highest-leverage change.

Asset-group discipline by service line. One asset group per service line (AC repair / heating repair / installation / commercial / maintenance contracts). Each asset group gets its own headlines, descriptions, images, video. Do not dump all your services into one asset group; PMax cannot distinguish services and will treat them as interchangeable for matching purposes.

Conversion-accuracy floor. PMax spend follows conversion data. Broken conversion tracking poisons every PMax decision. Before optimizing PMax, run the 5-step conversion-tracking diagnostic; if any layer is broken, fix it first. PMax with broken tracking is worse than no PMax.

Audience signals. Seed each asset group with 1st-party customer match (your CRM list of converted customers), website-visitor remarketing (anyone who hit a service page in the last 30 days), and 2-3 high-intent in-market segments (home-services intent, HVAC research intent). Audience signals do not restrict PMax targeting; they tell the bidder where to look for similar users.

Value rules. If your jobs are not all equally profitable (rare for HVAC), configure value rules to weight conversions by service type. Installation = 10x repair value. Commercial = 5x residential. Without value rules, PMax treats a $200 service call the same as a $14000 system replacement; spend follows the wrong jobs.

Brand keyword exclusion. Add your brand name (and common misspellings) to PMax brand exclusions. Otherwise PMax bids on your own brand searches and double-charges you (your search campaign already covers brand at $0.50 CPC; PMax bidding on the same query at $5 CPC is pure waste).

Audit logic

What the audit catches on PMax HVAC accounts

The audit catches PMax issues at three layers. First, the audit reads the account's PMax campaign structure: are there separate asset groups per service line, or is it a single dump? Are audience signals attached, or are asset groups running 'audience expansion' with no seed signal? Is the brand exclusion list populated, or empty? These structural checks fire as findings before any performance data is reviewed.

Second, when PMax placement-report share is enabled (account-level setting), the audit pulls the top placements by spend and flags low-quality patterns: parked domains, mobile-game app IDs, MFA-named sites. The finding includes the specific domain names observed and the proportion of total PMax spend going to the bottom quality cluster. When placement share is not enabled, the audit fires a lower-priority finding flagging the share setting itself as a fix step.

Third, the audit cross-references PMax conversion volume against the conversion-tracking accuracy check. PMax accounts with broken phone-call tracking are flagged as 'PMax optimizing on incomplete signal' because every PMax decision is downstream of conversion accuracy. Fixing tracking before tuning PMax is the correct order; the audit surfaces the dependency explicitly.

Where this connects

PMax sits downstream of conversion tracking and upstream of cost-per-booked-job math. Read across the cluster to put the placement-quality fix in context.

Upstream

Conversion tracking 5-step diagnostic →

PMax decisions are downstream of conversion tracking. If tracking is broken, PMax is optimizing on incomplete data; fix tracking first, then tune PMax. The 5-step diagnostic finds which layer is dropping the signal.

Math context

Good ROAS for HVAC Google Ads →

PMax cost-per-booked-job only matters if you know what 'good' looks like for your margin. The break-even ROAS formula and branded-vs-non-branded benchmarks frame the math.

Audit pattern

HVAC PPC audit walkthrough →

What an HVAC PPC audit looks like end-to-end. The audit's PMax checks are one section of a larger 8-step audit covering structure, tracking, copy, landing pages, negatives, geo, schedule, and quality.

Money page

HVAC Google Ads management →

The vertical-level page: positioning, audit substrate count, common findings across every HVAC account audited. Read this for the vertical specialization stance separate from this page's PMax-specific fix.

Send your domain. Get a PMax-aware audit back.

Free, ~48-hour turnaround, no sales call. The audit pulls PMax placement reports (when share is allowed), reads asset-group structure, and flags the placement-quality gap with specific low-quality domains observed.

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