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.

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.

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.

Building owners and facility managers are quickly adapting to smart building trends that can both attract tenants and improve operational efficiency. Today, commercial buildings are more linked with connected devices than ever, from lightbulbs and thermostats to security alarms and elevators.

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.

Optimum Energy’s patented software and engineering expertise has helped customers reduce energy use in heating and cooling systems, the largest consumer of energy in buildings, by up to 50%. Their solutions combine technologically advanced HVAC optimization software with powerful cloud-based data analytics and world-class engineering support.

Orange Coast Plumbing is the best choice in Southern California for plumbing, heating, and air conditioning repair and installation.

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

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.

As a full service Air Conditioning, Heating and Ventilation company, OSBORN AC and Heat has been delivering high standard HVAC services.

Oventrop is one of the European manufacturers of valves and controls for the Building Services Industry. The company is an expert partner to stockists, consultants, contractors, and industry. Oventrop offers its partners a long-term beneficial relationship.

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.

OVO is on a mission through its sustainability strategy Plan Zero to tackle the most important issue of time; the climate crisis, by bringing customers with us on the journey towards zero carbon living. OVO Energy has committed to being a net zero carbon business and achieving bold science-based carbon reduction targets by 2030 while helping members reduce their household emissions at the same time.

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.

Oxygen8 is changing the way buildings provide healthy, comfortable and energy efficient spaces for occupants. They provide 100% fresh, filtered air and smart technology for maximum comfort and value.

Melbourne homeowners typically opt for multi-head split system air conditioning installations to cool down bedrooms and living areas. Oz Air generally recommend single or multi-split systems for most residential customers, depending on the design and construction of the building.

P & R Heating provides a wide range of installation and servicing such as mechanical installation, plant room renewals, heating installation (large and small scale), hot and cold water storage and distribution, plant control installations, gas and oil servicing and maintenance, periodic test and inspection, emergency lighting and much more.

Pace Heating and Air - Albany service all makes and models of furnaces and air conditioners. And they proudly offer the full line of Carrier heating and cooling equipment, as well as hearth products from HEAT-N-GLO.

Pamlico Air, Inc. is a family owned business. They have been in operation since 1990. From the first day in business, their goal has been to provide first rate service with top-quality products.

Panasonic Connect drive innovation in the supply chain, public services, infrastructure, and entertainment sectors. In the development, manufacture and sale of devices, including system integration, installation, maintenance and repair services, the aim is to contribute to the realization of a sustainable society and to ensure well-being for all.

Panasonic is the premier manufacturer of powerful, energy-efficient ventilation fans and indoor air quality solutions. We produce the highest quality, code compliant solutions available in the market today.

Fusing Panasonic's cutting-edge technology with Anchor's extensive reach and customer support, they now present a seamless array of innovative Electrical Construction Material (ECM), lighting, ventilation, smart homes, solar and EV products that surpass global standards.

Paneltex is a global leader in the refrigerated and specialised commercial vehicle body building sector. The company operates six production sites in the UK, offering a wide range of first class products.

The company, PANOP spol. sro was founded in 1992 for the purpose of wholesale in the field of WATER-HEATING-GAS-SANITARY SYSTEMS. The company gradually expanded its activities to include retail sales so that it could satisfy the end customer demanding exclusive prices in this sector. It has been selling this range for about 20 years.

Paramount Airconditioning has been providing mechanical services solutions. Their experienced workforce has the expertise, dedication and professional approach that has seen them complete a wide diversity of mechanical services projects.

At Parasense, they provide food retail, military, nuclear and industrial sectors with innovative and cost effective refrigerant management, energy management, systems integration and performance management solutions.

Particles Plus offers a line of patented advanced-technology particle counters, air quality monitors, and environmental sensors. As the most vertically integrated particle counter manufacturer and technology licensing company in the industry, Particles Plus engineers and manufactures its own counter, display, battery, vacuum pump, and sensor technology from the ground up.

Paschal has provided professional Heating & Air, Plumbing & Electrical services to homeowners & businesses in Arkansas, Texas, Oklahoma, Kansas & Missouri. They provide air conditioner repair and replacement services, water heater installation, generator sales & service, & more.

Paschal Heat, Air & Geothermal, the team of trained and certified HVAC technicians in Northwest provides timely, friendly support, and they guarantee 100% satisfaction from start to completion.

PHIUS (Passive House Institute US, Inc.) is an organization committed to making high-performance passive building the mainstream market standard. PHIUS+ buildings provide superior indoor air quality, resilience during power outages, and an extremely quiet, comfortable indoor environment.