Erica BAUM

Last year Nolan Gray mapped out “the cities of the world where you don’t need AC or heat.” And just recently he updated his data with the help of Guardian Cities for their “sweltering cities” series. As part of the study, they projected out average temperatures, in both the summer and winter, to 2059, showing which cities may become more dependent on air conditioning. The answer looks to be many.

In his original study, Gray had 9 climatic categories, all of which were based on average high and low temperatures throughout the year. Category 1 was you definitely don’t need AC or heat. These cities are essentially perfect year round. And category 9 was you definitely need heat and AC. These cities are basically the worst places on earth to occupy from a climate perspective.

Here is that climate classification system in lovely chart form (note his caption):

The climatic utopias ended up being places like Bogotá, Guatemala City, Lima, Mexico City, San Diego, São Paulo, and Sydney. The worst places were the southeastern United States, Central Asia, and northern East Asia.

But one factor that is not included in the study is humidity, which Gray rightly points out has a meaningful impact on comfort. Toronto, for example, is classified in his system as category 7. Heat needed. But AC definitely not needed. Personally, I would bump us up to category 8: AC preferred, but not needed.

The Rising Sleeves Market is gaining strong momentum across multiple industrial sectors due to its essential role in providing flexible and extendable mechanical components. Rising sleeves, often used as telescopic or adjustable cylindrical structures, are critical in applications that require precision movement, durability, and adaptability. From automotive engineering to packaging machinery, these components are helping industries achieve higher efficiency and improved mechanical performance.

The Rising Sleeves market was valued at USD 584.6 Million in 2024 and is projected to grow to USD 799.2 Million by 2030, registering a CAGR of 5.4% from 2025 to 2030. This steady growth reflects increasing industrial demand for components that offer flexibility and reliability in operations. As industries continue to modernize and automate, the need for advanced mechanical components like rising sleeves is expanding significantly.

One of the primary growth drivers of the market is the rapid industrialization across developing regions. Manufacturing facilities are adopting modern machinery and automation systems, which require components capable of handling variable movements and loads. Rising sleeves provide the necessary adaptability, making them an integral part of modern industrial equipment. Their ability to extend and retract smoothly enhances operational efficiency and reduces mechanical wear and tear.

The Rising Sleeves Market highlights the growing importance of sustainability and innovation in sleeve-based solutions. Industries are increasingly focusing on eco-friendly materials and efficient designs to reduce environmental impact. This shift is encouraging manufacturers to develop advanced rising sleeve solutions that align with sustainability goals while maintaining high performance.

Another significant factor driving the market is the increasing demand in the automotive sector. Rising sleeves are used in suspension systems, steering mechanisms, and other critical components that require precision and durability. As the automotive industry evolves toward electric and autonomous vehicles, the demand for high-performance components is expected to rise further.

Technological advancements are also playing a crucial role in shaping the market. Innovations in materials, such as high-strength alloys and composites, are improving the durability and performance of rising sleeves. Additionally, advancements in manufacturing processes are enabling the production of more precise and reliable components.

The packaging industry is another key contributor to market growth. Rising sleeves are widely used in packaging machinery to facilitate smooth movement and adjustment. With the increasing demand for efficient and automated packaging solutions, the adoption of rising sleeves is expected to grow significantly.

Despite its growth, the market faces challenges such as high production costs and the need for specialized manufacturing processes. However, ongoing research and development efforts are helping to overcome these challenges by introducing cost-effective and efficient solutions.

The competitive landscape of the Rising Sleeves Market is characterized by innovation and strategic collaborations. Companies are focusing on developing advanced products and expanding their market presence to gain a competitive edge.

Looking ahead, the Rising Sleeves Market is expected to continue its growth, driven by industrial expansion and technological advancements. The increasing demand for efficient and reliable mechanical components will further boost market development.

Duct pressure classification represents a fundamental HVAC design principle that establishes construction standards based on the operating static pressure within ductwork systems. Professional engineers utilize SMACNA pressure classifications to specify appropriate duct construction methods, material thickness, reinforcement requirements, and connection details to ensure safe and reliable…