Carrier’s Viessmann deal as a test of cross-border M&A integration
In April 2023, Carrier Global agreed to buy Viessmann Climate Solutions, the heat pump and boiler business of a family-owned German group, for €12 billion. It was Carrier’s bet on Europe’s move from gas boilers to heat pumps, and a hard case of cross-border M&A integration: a US public company buying a German family business with strong labor protections.
The deal closed on January 2, 2024. That year, German heat pump sales fell by almost half. Carrier had already promised to keep jobs, sites and the headquarters in place, so it could not cut its way through the drop.
This case follows the Carrier Viessmann acquisition through what Carrier promised, what the market did, how the integration held up, and what any acquirer should log before signing a cross-border deal.
What Carrier bought, and what it sold to pay for it
Carrier paid 80% in cash and 20% in Carrier stock. That was about 13 times Viessmann’s projected 2023 EBITDA of €0.7 billion, after counting €200 million of planned cost synergies. Viessmann had about €4 billion of sales and more than 75,000 installers in 25 countries.
The stock went to the Viessmann family, which received the right to nominate a Carrier director for 10 years, according to Carrier’s 8-K. Max Viessmann joined the board at close, and Viessmann’s CEO, Thomas Heim, took over Carrier’s residential and light commercial HVAC business in Europe, the Middle East and Africa.
Figure 1. Carrier funded most of the Viessmann price by selling five businesses. Source: Carrier releases, 2023 to 2026.To fund it, Carrier sold its security, fire and commercial refrigeration businesses. The largest sale, Global Access Solutions to Honeywell, brought in $5.0 billion of cash in the second quarter of 2024. Carrier used it to redeem $1.0 billion of notes and repay €2.3 billion of term loans.
Four more sales followed, including the $3 billion fire business and, in July 2026, Riello for about $440 million. A clear acquisition strategy made the sequence possible: the buyer knew which businesses it would shed before it signed.
The promises that won the deal
A family seller cares about more than price. According to the Viessmann Group, Carrier agreed to keep the headquarters in Allendorf for at least 10 years, guarantee the main manufacturing and R&D sites for five, and make no terminations for operational reasons for three.
Figure 2. The shortest promise, on job cuts, is the one that mattered most in the downturn. Source: Viessmann Group statement; Carrier 8-K.The brand stayed with the family. Carrier licenses the Viessmann name under a 40-year agreement and pays an annual royalty for the first five years. Every one of these terms helped win the deal, and every one limits how the business can be run.
That trade is common in cross-border M&A integration. The post-close covenants that reassure a seller, a works council and a government also fix costs in place. HR due diligence should price them before signing, the way a lender prices a covenant.
The commitments that win a cross-border deal are the ones you live with after close.
Then German demand halved
Through 2023, Germany argued in public over a new law to phase out fossil-fuel heating. Buyers waited. According to the German Heat Pump Association, sales fell 46%, from 356,000 units in 2023 to about 193,000 in 2024.
Figure 3. The market Carrier paid for shrank by almost half in its first year of ownership. Source: German Heat Pump Association (BWP) via Clean Energy Wire..Viessmann’s sales were down almost 30% in the second quarter of 2024, about a third of that from solar products. In July 2024, Viessmann put part of its Allendorf workforce on short-time work, a German scheme in which the state tops up reduced hours.
With operational terminations ruled out, short-time work was the main lever left. A domestic buyer might have cut capacity; Carrier had promised not to. In cross-border M&A integration, this is the policy risk a financial due diligence model should stress: what happens to earnings if subsidized demand stops for a year.
How cross-border M&A integration played out: channel first
Carrier’s integration put the installer network first. It kept selling through Viessmann’s direct-to-installer channel, kept the Viessmann brand, and put Viessmann’s own leaders in charge of Europe. That protected what it had paid for: 75,000 installer relationships.
The numbers turned slowly. In the first quarter of 2025, Carrier’s Europe segment had organic sales down 7%, but residential orders were up by the mid-teens. Carrier said it was on track for more than $200 million of cumulative cost synergies in 2026 and about $100 million of revenue synergies in 2025.
For 2025 as a whole, Europe’s organic sales fell 3%, and the segment margin slipped to 8.8% from 9.4%. In the first quarter of 2026, heat pump sales rose by the low teens across Europe, and Carrier said it converted about 150 new installers.
By the second quarter of 2026, Europe’s residential sales were up high single digits. But the segment margin was 7.2%, lower than a year earlier, and Carrier booked a $46 million impairment on Riello before selling it.
The lesson is in the sequence. Go-to-market integration protected the channel, and HR integration worked within the covenants. Keeping local leaders also eased the culture gap between a US company and a German family business.
A covenant register for cross-border M&A integration
The core lesson: in a cross-border deal, price the promises you make to win it as carefully as the business you are buying.
Most sponsors will not buy a €12 billion business. The same promises show up in a €50 million cross-border acquisition of a German or French add-on. Log each one before signing, with its cost under a downturn and an owner after close. It is the cheapest cross-border M&A integration work you will do.
| Commitment | Term | Cost if demand falls 40% | Owner after close |
|---|---|---|---|
| No terminations for operational reasons | 3 years | Labor cost stays fixed while volume drops | HR integration lead |
| Main manufacturing and R&D sites | 5 years | No consolidation of plants or labs | Operations lead |
| Headquarters location | 10 years | Overhead stays in place | Integration office |
| Brand licence and royalty | 40 years; royalty for the first 5 | Fixed payment regardless of sales | Finance lead |
| Seller board seat | 10 years | Seller keeps a voice in strategy | Deal team and board |
Each row is a buy-side diligence question and a line in the 100-day plan. Add commercial due diligence on any demand that depends on subsidies, and test it at half of today’s volume.
Regulatory commitments can outlast the deal team, as NVIDIA’s Mellanox approval showed. Rentokil’s Terminix deal shows the other cross-border risk: an integration plan that meets a different local operating model.
Every covenant is a cost line. Put it in the model before you sign, not in the impairment test after.
For emerging managers: The Charter Program
Carrier had the balance sheet to sell five businesses and wait out a demand collapse. A Fund I, II or III manager buying its first European add-on has neither the cushion nor, usually, a corporate development team to price these terms.
The Charter Program is built for that gap: build the capabilities of a larger private equity firm without building the cost structure of one.
Origination carries no monthly retainer; Xpertegic earns a success fee at close and reinvests 10-20% of that fee into the platform. Diligence and integration are scoped and billed separately. Three managers are admitted in year one, starting with a pre-application.
Together these form an end-to-end M&A capability that prices each covenant before the deal is signed.
Sources
- Carrier, Carrier announces portfolio transformation to create global leader in intelligent climate and energy solutions, April 25, 2023
- Carrier, Form 8-K on the Viessmann purchase agreement, April 2023
- NaturalRefrigerants.com, Carrier announces €12 billion acquisition of Viessmann’s heat pump business, April 27, 2023
- Carrier, Carrier completes acquisition of Viessmann Climate Solutions, January 2, 2024
- Haustechnikdialog, Viessmann in der Kurzarbeit, July 1, 2024
- Carrier, Carrier reports strong second quarter 2024 results, July 2024
- Carrier, Agreement to sell Commercial and Residential Fire business for $3 billion, August 15, 2024
- Clean Energy Wire, Heat pump sales halved in Germany in 2024, January 22, 2025
- Carrier, First quarter 2025 earnings presentation, May 2025
- Carrier, Carrier reports 2025 results and announces 2026 outlook, February 2026
- Carrier, Carrier completes sale of Riello to Ariston Group, July 1, 2026
- Carrier, Second quarter 2026 results, July 28, 2026
