DeWalt provides high capacity battery for fans and blowers. They also provide air compressors, heaters & fans, coolers & drinkware, generators & portable power, heated jackets, pressure washers and much more.

Dexter + Chaney provides web-based software that allows contractors to get work done anywhere using any device, and without the need to download any software.

Dexwet Holdings Corp. is an air filter manufacturing and technology company with more than 60 patents, the first of which was filed in 2000 to mitigate fine dust particles effectively. Dexwet was built on a mission to have a positive effect on health by providing clean air for humans and machines.

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.

Digi-Key is one of the fastest-growing distributors of electronic components in the world. Digi-Key offers the world’s largest selection of electronic components in stock and available for immediate shipment. From prototype to production, they are here to fuel innovation all over the world.

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.

Dimer LLC is the manufacturer of GermFalcon is a patented sanitizing device that instantly kills infectious germs on surfaces and in surrounding air. Using only ultraviolet-C (UVC) light, the kind used in hospitals, this highly-effective device is mobile and compact — no larger than a flight attendant’s food and beverage cart.

Dimplex offers a variety of both indoor and outdoor electric heating solutions that are attractive in design, as well as powerful in performance. The heaters range from fan-forced to infrared and are suited to different spaces requirements. Dimplex electric fireplaces lead the industry with flame effect technology and realistic media bed accessories.

DiversiTech Corporation is North America’s largest manufacturer of equipment pads and a renowned manufacturer and supplier of components and related products for multiple industries, including: HVACR, electrical, consumer hardware retail, electrical utility, automotive retail and pool and spa channel.

Since their company's beginning in 1946, they have been dedicated to providing exceptional service and superior heating, ventilation and air conditioning service and systems to East Texas residents at home and work. Customer satisfaction is their #1 priority.

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.

Done-Rite Plumbing & Rooter is the premier plumbing company in Orange, California, USA. They are a full-service plumbing contractor offering everything from water heater installation & repair, drain cleaning sewer line repair & installation, and general plumbing services. They service the entire Orange County area and can be out to any property in the area same-day for plumbing services.

Donovan & Sons, Inc. provides a full range of plumbing, heating, ventilation and cooling services for both residential and commercial customers. The company is made up of 5th generation plumbers and HVAC technicians dedicated to providing their customers with prompt, reliable, professional services.

Douglas Cooling & Heating is a full-service HVAC company that serves the higher Birmingham area. They strive hard to provide prompt and efficient solution.

Dowdle Heating and Air has been serving North MS since 1952. In 2012, Chris Powell merged with Dowdle to create Dowdle and Powell Heating and Air. They are an HVAC contractor. They offer service, sales, installation and fabrication of all HVAC equipment including air conditioners, thermostats, heat pumps, air filters, gas furnaces, programmable thermostats, humidifiers, ductless split systems.

Dowling Corporation is a pioneer HVAC/R mechanical services provider serving clients in New Hampshire, Southern Maine, and the North Shore of Massachusetts. Providing comfort and peace of mind since 1961.

Downriver Refrigeration Supply Co. is a renowned full line HVACR (Heating, Ventilation, Air Conditioning, and Refrigeration) distributor in the metropolitan Detroit area of the United States.

Dring Air Conditioning & Heating is a family-owned business which makes them a rare breed in this era of big box stores and Internet commerce. They first opened their doors in 1953, and as their core of loyal HVAC heating and cooling customers has grown, their area of service has expanded.

DT Air Conditioning & Heating is Texas' renowned expert heating and cooling company. They offer furnace and air conditioning services in and around Plano, Texas, USA.

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.

Ductcap Products Inc. are renowned manufacturers of temporary reusable duct end covers. These duct end covers help keep duct work clean during shipping, staging and during construction.

DUCTZ has been providing industry-leading air duct cleaning and HVAC restoration services for residential and commercial properties alike.

Duke Energy is one of the largest energy holding companies in the United States. Its Electric Utilities and Infrastructure business unit serves approximately 7.5 million customers located in six states in the Southeast and Midwest.

Duncan Supply Company, Inc. is a wholesale distributor of refrigeration, air conditioning and heating, & food service equipment & parts,

Duquette Refrigeration has provided commercial refrigeration and HVAC service, installation, and 24/7 emergency repair to businesses throughout New England since 1986.

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.

Durkee® is a multi-national high-tech enterprise with a focus on offering solutions of high quality elastomeric thermal insulation, customized fabric air ducting and A/C system integration in the HVAC/R industry over the past 25 years.