Energy Code Compliance: The 2026 Due Diligence Question Nobody's Asking

You're looking at P&Ls, customer lists, truck fleets. Good. But you're probably skipping the question that will determine whether this company can legally install equipment in 18 months. Building energy codes are rewriting what an HVAC business is worth — and most buyers aren't even checking.

The Code Change That Reshapes HVAC Acquisitions

California's 2025 Energy Code went into effect January 1, 2026. If you're reading this, it's already live.

Here's the headline: heat pumps are now the prescriptive default for space heating and water heating in all California climate zones. Every single one. A contractor can still install a gas furnace, but the compliance path just got significantly harder and more expensive.

This isn't a ban on gas. It's worse — for business owners who aren't ready. The California Energy Commission structured it so that heat pumps are the easy path. Gas requires performance modeling — think third-party energy calculations, Title 24 documentation, proof that your gas system meets or exceeds what a heat pump would deliver. That modeling costs $500–$1,500 per project, eats margin, and slows down your permitting timeline.

If you're evaluating an HVAC business right now, the first question is simple: can this company install heat pumps at scale, or are they a gas shop hoping the rules don't apply to them?

Why This Matters More Than You Think

You might be thinking: I'm buying a company in Texas, not California. Fair point. But building energy codes move like dominoes, and California pushes the first one.

States already following California's lead

• Washington: Clean Buildings Act requires heat pump replacements for end-of-life commercial HVAC in buildings over 50,000 sq ft. Residential codes tightening on a parallel track.
• Colorado: Updated building codes adopted in 2024 with strong heat pump incentives baked into compliance pathways.
• New York: All-electric requirements for new buildings under seven stories already in effect. Broader mandates in the pipeline.
• Massachusetts, Maryland, Oregon — all at various stages of adopting California-style prescriptive heat pump language.

The Department of Energy's model energy codes are trending in the same direction at the federal level. When the IECC model code updates, states that adopt it get pulled along.

The math is straightforward

A company that can only install gas furnaces in a market that's moving to heat-pump-first codes is a company with a shrinking addressable market. That's not speculation. That's what the permits will say.

If you wouldn't buy a roofing company that can only install one type of shingle, don't buy an HVAC company that can only install one type of heating system. Especially not one that the codes are actively moving away from.

What the 2025 Energy Code Actually Requires

Let's get specific. The California 2025 Energy Code (Title 24, Part 6) changed several things that directly affect an HVAC company's operations.

Residential new construction

• Heat pumps are the prescriptive default for space heating and water heating in all 16 California climate zones. Previously, some zones allowed gas as the default.
• Gas furnaces can still be installed, but only through the performance compliance path — which requires energy modeling to prove the home meets overall efficiency targets despite using gas. This adds cost, time, and complexity to every gas job.
• Heat pump water heaters are now the baseline. Electric resistance and gas water heaters require the same performance modeling workaround.

Residential retrofits and alterations

• HVAC changeouts in existing homes must meet updated efficiency minimums. Heat pump replacements get the streamlined compliance path.
• Duct testing and sealing requirements tightened. If a company's techs aren't already doing duct leakage testing on every changeout, they're behind.

Commercial buildings

• End-of-life rooftop units (RTUs) in certain building categories must be replaced with high-efficiency heat pump units when the existing equipment is replaced. This isn't a future mandate — it's triggered by the replacement event.
• New commercial buildings have prescriptive heat pump requirements for space conditioning.
• Ventilation and envelope requirements updated — more load calculation work, more documentation.

Title 24 documentation

This is where a lot of companies fall apart. Every permit-required HVAC installation in California needs Title 24 compliance documentation — CF1R forms for residential, CF1R-NCB for nonresidential. Heat pump installations have a straightforward documentation path. Gas installations through the performance path require significantly more paperwork.

The penalty for getting it wrong: $500–$2,000 per day per violation. That's not a theoretical risk. Building departments are actively enforcing. One company paid $14,000 in fines over 28 days because their Title 24 documentation on three gas furnace installs was incomplete. That's money straight out of your pocket as the new owner.

The Due Diligence Checklist You're Missing

When you're evaluating an HVAC acquisition, add these items to your diligence. Your broker won't hand them to you. Your CPA won't think to ask. This is HVAC-specific, and it matters.

1. Revenue mix by equipment type

Pull the last 24 months of installation invoices and categorize them:

• Heat pump systems (ducted, ductless, dual fuel) — what percentage of total installation revenue?
• Gas furnace / AC combo — still the majority for most companies.
• Commercial RTU — gas vs. heat pump split.

What you want to see: 25–40% heat pump revenue and growing quarter over quarter. A company at 10% or less is behind. A company at zero is a red flag in any state with tightening codes.

2. Workforce heat pump competency

This is the big one. Ask specifically:

• How many techs are trained and certified on heat pump installation? Not just mini-splits — full ducted heat pump systems, dual fuel configurations, cold climate heat pumps.
• How many have completed manufacturer-specific training (Carrier, Trane, Daikin, Mitsubishi) on current heat pump product lines?
• How many are certified for A2L refrigerant handling?

A2L refrigerants — R-32, R-454B — are the new standard for heat pump equipment. They're classified as mildly flammable. That's a real distinction from the A1 classification of R-410A. Techs need specific training on charge size limits, installation clearances, leak detection, and brazing procedures for A2L systems. This is separate from the broader refrigerant transition happening with the R-410A phase-down, and it's separate from EPA SNAP program compliance. It's code-driven, not EPA-driven.

What you want to see: At least 50% of installation techs with documented heat pump training. 100% of techs handling new equipment should have A2L certification. If the company has zero A2L-certified techs, budget $2,000–$4,000 per tech for training and certification as a post-acquisition cost.

3. Title 24 compliance track record (California)

If the target company operates in California, request:

• Title 24 compliance documentation samples from the last 12 months.
• HERS (Home Energy Rating System) rater relationships — who do they use, how often, what's the turnaround?
• Any history of permit rejections, failed inspections, or compliance violations related to energy code documentation.
• CF1R form completion rates — are they filing on every permitted job, or cutting corners?

If you're buying outside California, check whether the target state has adopted or is adopting similar documentation requirements. Many states reference the IECC, which is on a tightening trajectory.

4. Permit pull history

This one's sneaky. Request the company's permit history from the local building department for the last two years. Compare the number of permits pulled to the number of installations invoiced.

If the company is doing installations without pulling permits — especially HVAC changeouts that many contractors skip — you've got a compliance problem that becomes YOUR compliance problem on day one. In a post-acquisition world with tighter energy codes, unpermitted work is a ticking time bomb.

5. Equipment supplier relationships

Who are their primary equipment distributors? Are those distributors stocking heat pump product lines, or are they primarily gas-furnace distributors?

A company buying from a distributor with deep heat pump inventory and training support has a structural advantage. A company buying exclusively from a gas-heavy distributor is going to have supply chain friction during the transition.

Check their existing equipment and fleet relationships — what's in the warehouse tells you what they've been selling.

The Workforce Question: Heat Pump Skills Are the New Premium

The Bureau of Labor Statistics projects the HVAC industry needs 349,000 to 439,000 net new workers through 2026. That's already a crisis. But here's what makes it worse for acquisition buyers: techs with heat pump installation skills are disproportionately scarce and disproportionately valuable.

An HVAC tech who can install and service gas furnaces is useful. An HVAC tech who can install ducted heat pumps, configure dual fuel systems, handle A2L refrigerants, and complete Title 24 documentation correctly is worth 20–30% more in the market right now.

When you're valuing the workforce of the company you're buying, heat pump competency isn't just a line item. It's a multiplier on the entire acquisition value.

What heat pump competency looks like in a workforce

• Basics: Techs can install ductless mini-splits and simple heat pump replacements. Most companies have this. It's table stakes.
• Intermediate: Techs can design and install ducted heat pump systems, including Manual J load calculations for heat pump sizing (different from gas furnace sizing). They understand auxiliary heat staging, defrost cycles, and cold-climate performance curves.
• Advanced: Techs can do full dual fuel system design, handle commercial heat pump RTU installations, complete Title 24 energy compliance documentation, and train junior techs. These people are rare.

The acquisition play: If the company you're buying has 2–3 advanced-level heat pump techs, that workforce alone may justify a premium. If it has zero, you need to factor 6–12 months and $15,000–$30,000 in training costs to get there. ACCA offers quality-installation training programs that can accelerate this, but it still takes time and money.

How Energy Codes Affect Acquisition Multiples

Let's talk numbers. The energy code dynamic is showing up in deal multiples — especially in states with aggressive timelines.

What PE buyers are looking for

Private equity firms rolling up HVAC companies are now explicitly screening for heat pump capability. It's on their acquisition criteria lists, right next to recurring revenue percentage and customer concentration.

A company in California or Washington with strong heat pump revenue (30%+ of installs) and a trained workforce is seeing multiples of 4.5–6x SDE. A comparable company in the same market with less than 10% heat pump revenue is sitting at 2.5–3.5x SDE.

That gap is real. On a $400K SDE business, the difference between a 3x and a 5x multiple is $800,000. That's what energy code readiness is worth to a sophisticated buyer.

What individual buyers should learn from this

You're probably not competing with PE firms. But their valuation framework tells you something important: the market has already priced in energy code compliance as a value driver. If you can buy a company that's behind on heat pump capability, retrofit it yourself, and build that competency over 2–3 years, you're creating equity.

That's the arbitrage. Buy the gas-heavy company at a lower multiple, invest in training and equipment, shift the revenue mix, and sell it at the higher multiple when you exit. But only if you actually execute the transition. A gas-heavy company that stays gas-heavy in a heat-pump-first market doesn't get more valuable. It gets less valuable every year.

The Licensing Angle You Can't Ignore

Energy code compliance intersects with state licensing requirements in ways that trip up buyers. Here's the short version.

Some states are updating their HVAC contractor licensing requirements to include heat pump and A2L refrigerant competency. California's CSLB (Contractors State License Board) is moving toward requiring demonstrated heat pump training for C-20 (HVAC) license holders.

If you're buying a company and planning to operate under the existing license, verify:

• The license covers heat pump installation (not just gas furnace and AC work).
• The qualifying individual (often the selling owner) has the required certifications. If they're leaving, YOU need those certifications or someone on your team does.
• A2L refrigerant handling authorization is in place or obtainable.

A license gap means you can't pull permits. Can't pull permits means you can't do legal installations. Can't do legal installations means you bought a company that can't generate revenue in its primary market.

Red Flags in the Seller's Energy Code Story

When you're sitting across from a seller and asking about energy code readiness, listen carefully. Some common things you'll hear — and what they actually mean.

"We don't do much new construction, so the energy code doesn't really affect us."

Wrong. Retrofit and replacement work is increasingly covered under updated energy codes. HVAC changeouts trigger Title 24 compliance in California. Other states are moving the same direction. This seller doesn't understand their own regulatory environment.

"Our guys can figure out heat pumps — it's not that different."

It is different. Load calculations, refrigerant handling, charge limits, electrical requirements (heat pumps pull more amps than gas furnaces), defrost staging — a gas furnace tech needs real training to install heat pumps correctly. "Figure it out" leads to callbacks, warranty claims, and code violations.

"We've installed a few mini-splits."

Mini-splits are the gateway drug. They don't equal heat pump competency. Ducted heat pump systems, dual fuel configurations, and commercial heat pump RTUs are where the market is going. Mini-split experience is a start, not a finish.

"The codes keep changing — we'll adapt when we need to."

This is the most dangerous answer. It means the company has no transition plan, no training pipeline, and no revenue diversification strategy. You'll be buying a company that's reactive, not proactive. Budget accordingly.

Building Your Energy Code Due Diligence Into the Deal

Here's how to turn this analysis into deal leverage and protection.

Pre-LOI screening

Before you even submit a letter of intent, ask these four questions:

1. What percentage of installations in the last 12 months were heat pump systems?
2. How many techs are A2L refrigerant certified?
3. Has the company had any energy code violations or failed permit inspections in the last 3 years?
4. Does the company have active Title 24 compliance processes (or equivalent in their state)?

If the answers are "not much," "none," "I don't know," and "what's Title 24?" — you're looking at a company with a compliance gap. Not a deal-killer, but absolutely a factor in your offer price.

Price adjustment

If the company needs significant heat pump capability building, quantify it:

• Workforce training: $2,000–$4,000 per tech × number of techs = your training budget.
• Equipment and tools: A2L-compatible recovery machines, leak detectors, manifold gauges. Budget $3,000–$5,000 per fully equipped truck.
• Documentation systems: Title 24 software, HERS rater relationships, compliance workflow setup. $5,000–$15,000 depending on volume.
• Revenue ramp time: 6–12 months to shift the revenue mix meaningfully. Factor in opportunity cost.

Add those up. Present them to the seller as a documented adjustment to your offer price. This is not nickel-and-diming — it's accurately pricing the transition cost that the seller didn't invest in.

Post-close protection

Include representations and warranties in the purchase agreement covering:

• All HVAC installations in the trailing 24 months were properly permitted and code-compliant.
• No known energy code violations, pending investigations, or unresolved permit issues.
• All refrigerant handling was conducted by EPA-certified technicians using approved equipment.

If the seller won't make these reps, that tells you something. Put an escrow holdback in place to cover potential compliance liabilities.

Frequently Asked Questions

Energy code compliance isn't a regulatory footnote. It's a fundamental driver of what an HVAC business is worth in 2026 and beyond. Every acquisition you evaluate should get the energy code treatment: workforce capability, revenue mix, documentation practices, permit history, and equipment readiness. The companies that are ready are commanding premium prices for a reason. The companies that aren't ready are either discounted appropriately — or they're traps for buyers who don't ask the right questions. You spent years mastering the technical side of HVAC. Now you need to master the business side. Energy codes are where those two worlds collide. Don't skip the question.

Ready to keep building your due diligence framework? Start with the full chapter guide for a complete walkthrough of every factor in an HVAC acquisition.

This article is part of the Acquire HVAC buyer's guide series. For related topics, see our coverage of the refrigerant transition, workforce valuation, and equipment fleet assessment.