Dave Regnery
Chair & Chief Executive Officer at Trane Technologies
Thanks, Zach, and everyone, for joining us on today's call. Let me begin with few comments on our purpose as the company to boldly challenge what's possible for sustainable world. Our purpose is at the heart of our strategy, which is linked to powerful megatrends like climate change. This enables us to drive differentiated financial results and shareholder returns over the longer term.
The recent news on climate change has been sobering. Water temperatures off the Florida coast recently soared to over 100 degrees. We've seen deadly heat waves in parts of United States, Europe and Asia in one of the Earth's hottest summer on-record. In fact, scientists say these temperatures are likely the warmest the planet has seen in 120,000 years, and have dangerous effects on the environment, economy and human lives. Urgent action is needed to limit global warming and preserve our planet for the next generation. Our customers are seeking sustainable solutions and choosing Trane Technologies as their partner in de-carbonizing the environment and the cold chain. We are leading the way with our innovation and the result is long-term value creation across the board for our team, our customers, our shareholders and for the planet.
Moving to slide number 4; our global team continues to execute at high levels and deliver another quarter of strong performance, showcasing the benefits of our diverse, resilient portfolio. Organic revenue was up 11%. Adjusted operating margins expanded 110 basis points and adjusted EPS grew 24%. We delivered 30%-plus organic leverage across enterprise in each segments led by our commercial HVAC businesses in each region. Our residential HVAC business continued to normalize and was further impacted by a difficult comp versus the second quarter of last year when revenues were up 30%. Net on the two-year stack, residential revenues were up mid-teens at Q2. Importantly, we are delivering strong results while increasing business reinvestments. We are accelerating high ROI projects in focused areas, including digital, electrification and factory automation. These investments are flowing through our segment results, as well as through corporate expenses for enterprise-wide initiatives to drive innovation, growth and productivity well into future.
Bookings remained robust after reaching unprecedented levels in 2021, with nearly 30% bookings growth. In 2021, bookings exceeded revenue by approximately $2.7 billion, nearly doubling our backlog in a single year to $5.4 billion. During 2022, bookings grew more modestly, up 5%. However, the sharp increases in absolute bookings in 2021 translated 5% bookings growth in 2022 to another 27% increase in the backlog. Net, 2021 and 2022 are both important drivers of our strong backlog position of $7 billion at the end of the second quarter which is roughly 2.5 times historical levels. We've been encouraging investors to look at absolute booking levels and backlog in addition to growth rates to gain more complete understanding of strengths of our businesses.
Further, when looking at growth rates for Trane Technologies, it's important to consider three-year stacks that included 2021 for reasons discussed. Commercial HVAC continues to be the standout across our segments globally. In the second quarter, commercial HVAC bookings were up nearly 40% in each region on a 3-year stack, supporting revenue growth of high-teens in both the Americas and EMEA and 45% in Asia. Additionally, our commercial HVAC book-to-bill ratios were effectively 100% or higher in each region. Our end markets continue to be healthy overall, and we believe we are well positioned for strong growth in 2023. While it's premature to dial in an outlook for 2024, continued high levels of demand and extremely strong backlog position, particularly across commercial HVAC businesses globally, puts us in a strong position to drive growth in 2024 as well.
We expect to enter 2024 with elevated backlog of more than $6 billion. To put that in perspective, backlog has historically represented approximately 20% of the next year's revenue. It's also worth noting that $2 billion of our $7 billion in current backlog for equipment to be delivered in 2024. This is approximately 5 times level of backlog for next fiscal year versus historical trends at the end of the second quarter. Our strong results through first half combined with healthy end markets, and backlog that remains 2.5 times norms position us well to raise our full year 2023 guidance. Chris will discuss this in more details later in his prepared remarks.
Please to slide number 5. As we discussed bookings in revenue growth were broad based globally, with particular strength in our commercial HVAC business in all regions. Enterprise in Americas booking were down 5% and 8% respectively, largely due to softness in our Americas residential business, which was down approximately 20% in the quarter as business continues to normalize. Excluding the impact of residential bookings declined. Enterprise bookings were up 1% and Americas bookings were down low single digits. In our America segment, commercial HVAC bookings were down mid-single digits against high teens growth comp in prior year. Absolute bookings remained robust with growth of approximately 40% on 3-year stack. Commercial HVAC revenues were up high-teens in quarter with strong growth in both, equipment and services.
Even with strong revenue growth, the book-to-bill ratio was approximately 100%. Commercial HVAC backlog remains highly elevated at 3 times historical levels. Residential HVAC revenues were down as expected as business continues to normalize. Revenues were down low-teens. However, it's important to note that team delivered leading revenue growth of 30% in second quarter of 2022. On a 2-year stack, business was up mid-teens.
In our transport refrigeration business, we delivered strong bookings and revenue growth up approximately 40% and 30% respectively. Revenue strength was broad based in North America with the big three truck trailer and APU's, up approximately 50%. In our newest segment, our commercial HVAC business delivered another strong quarter. Bookings were up mid-single digits on top of the low teams growth comp in prior year. Revenues were up high teens with strength in both, equipment and services; up mid-20s and high single digits respectively. Our transport refrigeration business is executing well in a modestly down market.
We expect EMEA weighted average transport markets to be down low single digits to mid-single digits in 2023 and for our Thermo King business-style performed and be relatively flat for the year. These revenue growth of mid-single digits in Q1 and revenues down low single digits in Q2 were well positioned to hit these targets for full year. In our Asia-Pacific segment, the team delivered strong results with bookings up mid-single digits versus bookings up mid-teens in prior year. Revenues were very strong up 41%. China results were robust with bookings and revenues up 20% and 40% respectively.
Now, I'd like to turn the call over to Chris. Chris?