How PE firms should evaluate marketing inside an HVAC platform deal

Walk into any PE deal team room evaluating a $25M EBITDA HVAC platform and you'll see a familiar pattern. Commercial DD is rigorous, financial DD is exhaustive, operational DD has been competently scoped — and marketing diligence is two slides built from a 90-minute call with the target's marketing manager and a screenshot of their Google Ads dashboard.

That's a problem, because HVAC is now the most marketing-dependent home services category. PE-backed HVAC platforms allocate $800K–$2M annually for marketing, compared to $48K–$72K for the independent contractors they're acquiring. Marketing is the EBITDA lever. And the lever doesn't get pulled correctly if the marketing review during diligence isn't structured around HVAC's specific economics.

What B2B SaaS marketing diligence misses about HVAC

Standard PE marketing diligence frameworks assume a B2B SaaS sales cycle: paid acquisition channels, MQL-to-SQL conversion, sales-cycle length, ACV trends. None of that transfers cleanly to HVAC, where the buyer is a homeowner with an emergency or a planned replacement, the sales cycle is hours not weeks, and the unit of measurement is the booked call to the dispatcher.

Apply the SaaS framework to an HVAC platform and you'll measure CPC, CTR, and form-fill volume — metrics that obscure rather than explain platform performance. The right questions: what's the cost per booked call by channel, what's the booked-call to revenue conversion through CRM and dispatch, and how does seasonality bend the channel mix over a 12-month period.

The seven questions HVAC marketing diligence should actually answer

1. What's the split between replacement-funnel and service-funnel demand, and how does the marketing engine address each? Replacement work ($8K–$15K systems) and service work ($150–$300 per visit) need different channels, different creative, different lead scoring. Platforms running them through the same paid-search architecture leak EBITDA on both.
2. How much of platform revenue is membership-attached, and what's the attach rate trend? Recurring service plans are 30–40% of platform EBITDA. The trend matters more than the absolute — if attach rate is declining, the lifecycle program is broken regardless of headline membership count.
3. What's the local-pack share-of-voice in priority DMAs for HVAC-emergency queries? This is the single most-asked organic question that compounds across the hold. If the target has 30%+ local-pack share in their core DMAs, that's a moat. If they have 5%, it's an opportunity.
4. How fragmented is the vendor stack? Most independent HVAC operators have 3–5 marketing vendors. PE-backed platforms that consolidate to a unified stack typically reduce spend 20–40% with equal or better output. The vendor map pre-close determines the size of this lever post-close.
5. What's the attribution methodology, and does it reconcile to the financial system? Multi-touch attribution that doesn't tie to actuals is fiction. If the platform reports marketing-sourced revenue but can't trace it through CRM-dialer-dispatch to a closed work order, the EBITDA bridge is built on quicksand.
6. What's the brand-equity trend? Branded search volume, review velocity, GBP impressions over the past 24 months. Flat or declining brand equity paired with rising paid spend is the structural pattern that erodes pricing power at exit — and it's invisible to commercial DD.
7. What's the marketing budget as a percent of revenue, and what's the trend? Below 4% is under-invested for an HVAC platform pursuing scale; above 9% suggests inefficiency or weak organic flywheel. The trend tells you whether the function is being professionalized or starved.

The findings that change the bid

Three categories of marketing diligence finding actually move HVAC platform bids. First: vendor concentration with no exit clause — a 36-month agency contract with the platform's largest marketing spend locked in becomes a real cost of integration. Second: attribution methodology failure — if reported marketing-sourced revenue doesn't reconcile to the financial system, the topline is suspect and the deal may need re-priced or structured around it. Third: brand-equity erosion across the roll-up portfolio — visible only in 24-month branded-search trend data and the local-pack share-of-voice by DMA.

These are the findings that surface in 3–4 weeks of specialist marketing diligence and almost never in two slides written by a generalist CDD provider. They're also the findings that justify the marketing diligence fee 5–10× over in the first 18 months of hold.

An HVAC platform without specialist marketing diligence isn't getting underwritten correctly. The biggest single EBITDA lever in the business is being assessed by a slide.

What good HVAC marketing diligence costs

A 3–4 week pre-LOI HVAC marketing audit typically prices at $35K–$90K depending on platform scale. For a $25M EBITDA platform paying $1.5M annually in marketing, this is rounding error against the EBITDA lever the audit unlocks. Vendor consolidation alone — the lowest-risk recommendation that almost always emerges — typically returns 5–10× the fee in the first 18 months of hold.

The right question isn't whether HVAC marketing diligence is worth the cost. It's whether the deal team is willing to underwrite a marketing-dependent business without specialist input on the marketing engine.