Private equity add-on acquisitions in the HVAC equipment sector rose 44 percent year-over-year in 2025 and have continued accelerating into 2026, according to Capstone Partners' latest sector analysis. Add-ons — where a PE-backed platform company acquires smaller, complementary businesses — have become the dominant deal type in HVAC M&A, outnumbering new platform investments and strategic acquisitions combined.

Understanding the buy-and-build dynamic is not optional for anyone who owns an HVAC business, works for one, supplies one, or invests in the sector. The 44 percent year-over-year acceleration is reshaping the competitive landscape in ways that will compound over the next several years.

What 44% Growth in Add-Ons Actually Means

A 44 percent year-over-year increase in add-on activity means that the PE platforms that were built during the acquisition wave of 2019 to 2022 are now in full execution mode — deploying capital against a pipeline of smaller acquisition targets with a speed and focus that would not have been possible during the platform-building phase.

The distinction between platform investments and add-ons matters: a platform investment establishes a new PE-backed company from scratch or through a large initial acquisition. An add-on purchases a smaller business and folds it into an existing platform. Add-ons are faster to execute, require less due diligence time, generate synergies with existing operations, and create value through multiple arbitrage — buying small businesses at lower multiples than the platform's own valuation.

Private equity add-on acquisitions in HVAC equipment rose 44% year-over-year in 2025 and have continued accelerating in 2026, according to Capstone Partners — with add-ons now representing the dominant deal type in HVAC M&A, driven by platforms executing buy-and-build strategies established during the 2019 to 2022 investment wave.

The Buy-and-Build Logic in Practice

The buy-and-build playbook is consistent across the platforms executing it in HVAC:

• Establish the platform: A PE firm acquires an anchor business — typically a regional HVAC equipment manufacturer, distributor, or service company with $20 to $100 million in revenue — at a valuation reflecting its stand-alone worth, typically 7 to 10 times EBITDA.

• Define the target profile: The platform identifies the geographic gaps, capability gaps, or customer relationship gaps it needs to fill to build a defensible and growing business. Add-on targets are chosen to fill specific strategic gaps rather than for generic revenue growth.

• Acquire at discount: Smaller HVAC businesses — those with $2 to $20 million in revenue — typically transact at 4 to 7 times EBITDA, well below the platform's own valuation multiple. Each add-on immediately creates value through this multiple arbitrage.

• Generate synergies: The combined entity reduces overhead duplication, leverages shared purchasing, and cross-sells between the customer bases of the platform and its add-ons. These synergies improve EBITDA margins across the platform, increasing the value of every dollar of revenue acquired.

• Sell the platform: After 4 to 7 years of add-on acquisitions, the platform — now with 5 to 20 acquired businesses, a defensible geographic footprint, and a demonstrated growth track record — is sold to a larger PE firm, a strategic acquirer, or the public markets at a premium multiple.

Which HVAC Segments Are Seeing the Most Add-On Activity

Add-on activity is not uniformly distributed across HVAC. Capstone's data points to specific sub-segments where buy-and-build activity is most concentrated:

• Data centre and mission-critical HVAC services: The fastest-moving segment, exemplified by Blackstone-backed Air Control Concepts completing four acquisitions. The data centre cooling thesis drives premium valuations and accelerated acquisition pace.

• Residential HVAC services: The largest segment by deal count, with dozens of PE-backed residential platforms adding geographic coverage through local contractor acquisitions. Service agreement penetration and recurring revenue are the primary value drivers.

• Liquid cooling components: Capstone reports having two liquid cooling component manufacturing deals currently in market — a signal that the add-on appetite extends into the equipment supply chain for data centre applications.

• Commercial mechanical services: Multi-trade commercial platforms are adding HVAC service capability to electrical, plumbing, and building performance businesses, creating comprehensive commercial building services companies that command premium valuations.

What This Means for Independent HVAC Businesses

The 44 percent add-on acceleration has direct implications for independent HVAC businesses of every size:

For businesses under $10 million in revenue: You are in the primary add-on target zone. Well-run businesses with clean financials, meaningful service agreement revenue, and reduced owner dependency are receiving multiple unsolicited acquisition approaches. If you have not yet been approached, it is likely only a matter of time. Understanding what your business is worth — and what specific characteristics drive that valuation — is increasingly important strategic knowledge.

For businesses competing against PE-backed platforms: The marketing spend gap, technology advantage, and purchasing leverage of PE-backed operators widens with each add-on. The competitive response — investing in digital presence, building service agreement programmes, developing specialist capabilities that platform operators cannot easily replicate — becomes more urgent as platforms accelerate.

Frequently Asked Questions

What is a PE add-on acquisition in HVAC?

A PE add-on is when a private equity-backed HVAC platform acquires a smaller, complementary business to fold into its existing operation. Add-ons build geographic coverage, capability, and customer relationships faster than organic growth while creating value through multiple arbitrage — buying smaller businesses at lower valuation multiples than the platform's own.

Why are PE add-ons in HVAC up 44%?

The 44% year-over-year increase reflects PE platforms established during the 2019 to 2022 investment wave now in full execution mode, deploying capital against pipelines of smaller acquisition targets. Favourable market conditions — easing financing costs, fragmented HVAC market, data centre demand tailwind — are all supporting accelerated add-on activity.

How much is a small HVAC business worth to a PE buyer?

HVAC businesses with $2 to $20 million in revenue typically transact at 4 to 7 times EBITDA in add-on acquisitions. Businesses with higher service agreement penetration, reduced owner dependency, and clean financial documentation command the upper end of that range. Data centre or mission-critical specialisation can push multiples higher.

Should I sell my HVAC business to a PE-backed platform?

That depends on your goals, timeline, and the specific deal terms. PE acquisitions can offer strong immediate liquidity but may involve management changes, cultural shifts, and operational requirements that differ from independent operation. Understanding your options — including ESOP, strategic sale, and PE sale — before engaging with acquirers gives you the most leverage.