Incorporated in 1950, De'Longhi Group is a globally renowned provider of portable heaters and air conditioners. They also manufacture electrical and kitchen appliances, along with consumer goods.

Decsa Srl is Italian excellence in the development, production and distribution of evaporative cooling products. Their closed-circuit and open cooling towers and evaporative condensers perfectly meet the HVAC, process cooling and industrial refrigeration markets.

Degree Day is an ISO 9001:2015 certified Indore-based Air Conditioning firm, which provides one-stop HVAC system solutions and consider themselves to be one of the major organizations for Design and Project Execution of Ventilation, Refrigeration and Air Conditioning applications.

Since 1971, Delta Cooling Towers has been the leading manufacturer of High Density Polyethylene (HDPE) cooling towers, air strippers, and water storage tanks. They are seamless, they do not leak or rust, and are impervious to any water treatment solution.

Delta Thermal Solutions, Inc. is located in Jackson, Mississippi, United States of America and is part of the Hardware, and Plumbing and Heating Equipment and Supplies Merchant Wholesalers Industry.

DeltaTrak, Inc., is a globally renowned innovator of cold chain management and temperature monitoring solutions. Their product line includes a wide range of temperature and humidity data loggers and wireless systems. They also have portable environmental test and measurement systems, including thermometers-digital and infra-red, temperature/humidity monitoring and recording devices and wireless systems in their inventory.

Deltrian (Deltrian International) is specialized in the filtration field for over 50 years. Thanks to its experience, the company is an expert in the air-quality management in various fields such as food-processing, automotive, microelectronic and pharmaceutical industries, and also in hospitals.

Demeva Refrigeration Limited is a design company based out of Formby, United Kingdom. Formed in 1985 Demeva Refrigeration Ltd has developed to become one of the UK’s pioneering construction, Insulated panelling, refrigeration and mechanical services specialists. Demeva Refrigeration Ltd ability to provide all services associated with construction, Insulated panelling, refrigeration, and mechanical services projects in house.

Dennis Supply Co. is a renowned wholesale HVAC equipment and solutions company. Their product portfolio includes HVAC equipment, accessories, air quality products, control equipment, motors and drive systems, refrigeration products, meters, tools, instruments, chemicals, and hydronics.

Dennis’ Heating and Air Conditioning, Inc provides HVAC Installation, Retrofits, Service and Maintenance, as well as a full service sheet Metal Fabrication Shop. They are capable of fabricating almost anything, if customers can draw it, they can build it. The company is known for their knowledge, reliability, and incredible customer service.

With around 600 colleagues, Deutsche Messe organizes more than 150 trade fairs and events at home and abroad every year. It is a global event organizer whose events and services have been bringing together exhibitors and visitors since 1947. Deutsche Messe has helped numerous small enterprises to become world market leaders, while at the same time supporting large-scale enterprises on their road to further expansion.

Dexen supplies heating components to OEMs in HVAC and Hearth industries. They are also renowned providers of gas control systems and remote monitoring systems for the HVAC industry. Their products include gas valves (millivolt, 3V, 6V, 24V), electronic ignition control modules, pilots and supplemental components. Our services are in quality management, warehousing, logistics, engineering consulting and custom applications.

DFW IT Partner is a Reliable IT Partner providing one-stop IT solutions in Dallas, Austin, Fortworth, Houston, and San Antonio, Texas, USA. They provide businesses with the expertise, resources, and support needed to drive innovation and stay ahead of the competition in today’s fast-paced digital landscape. By working with them, businesses can achieve their technology innovation goals more efficiently and effectively.

DHL Group is the world's pioneer logistic company. The DHL Group connects people and markets and is an enabler of global trade. It aspires to be the first choice for customers, employees and investors worldwide. To this end, the Group focuses on growth in its profitable core logistics businesses and accelerating the digital transformation in all business divisions.

Founded in 1988 with offices in Kansas City, Austin and Denver, Dialectic is a non-traditional mechanical, electrical and plumbing engineering firm that brings buildings to life. With deep expertise in a range of verticals – including distribution, cannabis, multifamily, senior living and retail/restaurants – they know that true success comes with partnering as an extension of the team.

Digital Twin Consortium is a global ecosystem of users ,who are driving best practices for digital twin usage and defining requirements for new digital twin standards. It coalesces industry, government and academia to drive consistency in vocabulary, architecture, security and interoperability of digital twin technology. It advances the use of digital twin technology from aerospace to natural resources.

DM Select Services has proudly provided heating, cooling and plumbing services to clients all around the Northern Virginia (NOVA) area since 2009. We have physical offices located all over the NoVA area in Ashburn, Burke, Fairfax Station, Leesburg, and Winchester, so we can meet you wherever you are located. Our team brings a wealth of HVAC experience and is focused on delivering quick turnaround times on our installations at an affordable price.

DNV GL is a global quality assurance, software solutions and risk management company. They provide classification, technical assurance, software and independent expert advisory services to the maritime, oil & gas, power and renewables industries. They also provide certification, supply chain and data management services to customers across a wide range of industries.

Donnelly is the most reliable mechanical contractor in New York City. Donnelly gives the clients peace of mind. Donnelly does this by providing the most innovative services and solutions through the experienced team. New York City’s premier provider of HVAC service, maintenance, and construction, as well as energy solutions.

Safe-T-Flush by Drain Shield is the new standard for condensate drain management, preventing leaks and clogs by ensuring a natural flow of condensation out of the drain line. The Safe-T-Flush system eliminates repetitive service calls, improve air quality with the unit, and prevent extensive and costly property damage.

Duct & Vent Cleaning of America, Inc. was founded in April of 1989 by Ron Eckman. As early as February of 1990, Duct & Vent Cleaning of America, Inc. joined NADCA, the HVAC Inspection, Maintenance and Restoration Association. In fact, they were the first company to be allowed membership that used portable hepa vacuums in the cleaning process.

For over 30 years, Duct Doctor USA has been providing quality air duct cleaning for both residential and commercial customers. Duct Doctor was founded by a board-certified allergist in 1985 with a mission to improve the air quality of homes and workplaces.

At Duct Hygiene they specialize in the servicing of commercial kitchen extraction systems, fresh air ventilation and Fire Damper Inspection & Testing. They provide maintenance services to both blue chip and private sector clients throughout the UK, performing over 7,500 service visits each year maintaining building safety and compliance.

Dura Products, Inc is a state-of-the art Indiana based manufacturer of metering, pumping and dispensing systems for the DEF, AG, and turf Chemical industries. Founded by owners with decades of knowledge in farming and the chemical sales industry, Dura Products Inc goes beyond excellent design to incorporate innovative, versatile and durable transfer pump solutions with the end consumer always in mind.

Duroair has fast become a pioneer in innovative airflow and air filtration technology. Duroair designs and manufactures flexible end-to-end clean air solutions, focusing on (i) painting and coating, (ii) dust and particulate collection, (iii) weld smoke and oil mist collection, (iv) positive and negative pressure clean rooms, (v) environmental isolation rooms and (vi) non-destructive testing applications.

Established in 1995, Dusty Ducts, Inc. is certified as a minority-woman-owned-small business. As a Michigan corporation we provide HVAC Restoration, Indoor Air Quality and Energy Conservation for clients throughout Michigan and across the Midwest United States.

The E.ON Group is one of Europe's largest operators of energy networks and energy infrastructure and a provider of innovative customer solutions for 50 million customers. Thus, they are decisively driving forward the energy transition in Europe and are committed to sustainability, climate protection, and the future of the planet.

Eagle Mechanical, Inc. is a HVAC, plumbing, process and piping mechanical contractor with 30+ years’ experience. They help customers to purchase, install, maintain or replace any heating, air conditioning, refrigeration and plumbing systems. They specialize in industrial and commercial facilities, like hospitals, office buildings, schools, and government facilities.

Earth City Distributing is a renowned distributor of HVAC solutions and equipment with headquarters located in Chesterfield, Missouri, USA.

Eco UK Group, originally established as Lutterworth Electrical in 1971, provides electrical services to the domestic and agricultural markets. Driven by the demand for high quality, energy efficient industrial luminaires, they provide high performance turn key solutions, LED lighting solutions, energy saving solutions and electrical contractor services.