OklahomaGroup offers premier sales representation to all sectors of the HVAC and Refrigeration markets throughout the state of Oklahoma. Account Managers are dedicated to customer's needs and are supported by market and sales specialists.

Okto International, a HVAC provider has been working with the mission is to operate their company under Christ-like principles & standards; with integrity, honor; and work ethic. They are a highly respected service provider in the areas of Heating and Air-Conditioning all over Houston with installation, repair and maintenance.

Olans Heating and Air Conditioning, based out of Alabama, offers HVAC services, including Heating Services, Installation, Air Conditioning and Air Filtration. The goal of Olan’s Heating and Air Conditioning, Inc. is to provide a difference in the quality of services provided to his customers beyond other independent HVAC businesses.

A family owned business, Olson Comfort Services takes pride in offering the highest quality heating and cooling services. They are licensed, bonded, and insured.

Omdia unifies and harnesses the depth and breadth of expertise from Informa Tech’s legacy research brands: Ovum, IHS Markit Technology, Tractica and Heavy Reading. They offer unparalleled, world-class research and consultancy to navigate the now and create the future.

Since 1975, OmegaFlex has been supplying quality-engineered flexible metal piping products that meet highly-engineered industrial, residential, and commercial applications. They provide flexible metal hose products, vibration absorbers, flexible gas piping, (CSST-Corrugated Stainless Steel Tubing for residential, commercial, and industrial applications); flexible piping.

On Air services the South Palm Beach County areas, Broward County and North Dade County.We install and service all major and minor brand air conditioners, serving both Residential and Commercial Customers.

ONDA S.p.A. is manufacturing company of advanced heat exchangers for refrigeration, heating and air conditioning equipment.

One Call Heating and Cool is a Georgia-based Air Conditioning, Heating, HVAC and Air Purification systems installation and services company.

One Hour Heating & Air Conditioning provides a wide range of HVAC services, including installation, maintenance and repair of air Conditioning Units, Heating, Furnaces, Air Quality, Thermostats, etc and is based out of USA.

One Hour Heating & Air Conditioning® of Lee's Summit is the most trusted source of HVAC services in the Lee’s Summit area. Their team of Lee's Summit heating and cooling technicians are highly trained and licensed, so that they can provide the best Lee’s Summit HVAC repairs, installation, and maintenance possible.

One Hour Heating & Air Conditioning of Lake Villa provides home owners throughout the Round Lake region with reliable and efficient HVAC services and solutions.

One Source Home Service, an Air Pros company, was founded on the premise of Integrity, Reliability, and putting the customers first. One Source Home Service is here to help the users with HVAC, ductwork, plumbing, electrical, and home energy needs in the Colorado Springs and Pueblo, CO areas.

One Source, Inc. provides complete building management services for commercial properties throughout San Diego. they work with clients in a wide variety of industries to coordinate services in every area of maintenance, from janitorial services to landscaping, high-pressure washing, carpet cleaning, window washing, junk removal, and much more.

Customers will often call when their home is uncomfortable and One Stop Heat & Air's goal is to provide them with fast, friendly, and efficient heating and or cooling services. Heating or cooling issues are never convenient, and they can also be stressful and expensive. One Stop aims to provide customers with the best service at a reasonable price.

ONICON Incorporated has been delivering market leading flow and energy measurement products since 1987. Their inventory includes hydronic insertion turbine flow meters, hydronic inline turbine flow meters, BTU meters, flow computers, vortex flow meters, electromagnetic flow meters. They have been delivering quality engineered flow and energy measurement instruments for hydronic heating and cooling systems for over 30 years.

Oozzio offers an one-stop-shop for HVAC supplies! Whether for appliance repair, HVAC business, or a DIY enthusiast, Oozzio has everyone covered. Discover top brands, heating, cooling systems, furnaces, mini splits, air conditioners & accessories at their stores. Their user-friendly website and powerful search tools are the most trusted source for residential & commercial HVAC equipment.

OpenTherm is a non-manufacturer-dependent system of communication between modulating HVAC appliances and room thermostats. It consists of a communication protocol and an interface specification. The OpenTherm communication protocol is primarily designed to control modulating heating appliances. The protocol is available to members of the OpenTherm Association only.

Opera Electronics Inc. develops and manufactures a range of indoor air quality and gas sensors for buildings. The core applications of the company are vehicle emissions monitoring in car parks, refrigeration gas leak detection, and combustible gas monitoring in HVAC plant rooms.

Optergy provides effective tools to help manage the building’s comfort conditions and improve tenant retention. By optimizing comfort conditions (temperature, humidity, and ventilation) they can ensure the tenants are happy and more productive.

Optima Heating and Air Conditioning has provided Melbourne homes and businesses with heating and cooling solutions for more than 30 years. Their extensive industry experience and strong supplier partnerships allow them to provide affordable heating, cooling, and ventilation solutions across residential and commercial projects.

The history of the ORION dry pump started in Japan with the oil-free rotary vane vacuum pump. Thanks to its reduced noise and longer life, the dry pump has been indispensable in automation and labor-saving applications, playing an active and wide-ranging role for every kind of industry

Orival has supplied thousands of filtration units for a wide variety of customers, including Fortune 500 companies, farms, local municipalities, federal government agencies, and many more. Orival automatic self-cleaning filters are proven effective in filtration or recirculating and once through cooling water and chilled water in HVAC systems.

Orell Filtration is based in Stalybridge and supplies Dust Extraction Equipment, Bulk Bags, Air Filters, Filtration Products, Filter Fabrics, Filter Sleeve Bags, Multipockets, and much more.

Over 25 years ago, Victor Orzech began an HVAC company out of a basement workshop in his home. The years have brought many changes, but one thing remains the same: a commitment to the highest level of service and installation in the HVAC industry.

Ouellet is the manufacturer of heating and ventilation equipment for institutional, commercial, industrial and residential applications; electric heating equipment to include unit heaters, ceiling heaters, cabinet heaters, baseboard, bath ventilation, Heating Cable, Self-Regulating Cable etc.

Oversluizen distinguishes itself by developing and producing cooling solutions for the industry 1-on-1 with the client. In their own factory in Ridderkerk they calculate and produce the coolers for the project in-house.

Owen AC Services specialize in providing HVAC services, as well as air quality services. They work with air conditioners, providing installations, repairs, and maintenance, as well as heaters. They work with folks throughout Houston and the surrounding area, and they strive to ensure that home is comfortable, and its air remains fresh and healthy.

Owens Companies brings over six decades of experience to each building they service. They are the leading fully integrated, single-source mechanical contractor in the Twin Cities. Twenty-four hours per day, seven days per week, Owens is here for home or business.

Oxyphen is the manufacturer of microporous track-etched membranes. Since more than two decades they develop and produce customized membranes and membrane products for applications in the automotive and life science sector as well as for industrial applications. They offer complete service from a single source ranging from the development and production of membranes to the construction and series production.