30 years of experience

With care for your comfort

TANGRA – AV OOD is family company, specialized in the field of ventilation, air conditioning and heating equipment. The company was recovered in 1989 by Dipl. Eng. July Armianov. His father has founded the commercial and production company TANGRA-Lazar Armianov in the late 1930’s. After WW II the company was nationalized by the government and private business was forbidden in Bulgaria till 1989.

Nowadays TANGRA has HVAC design bureau, production facility with total floor area of 5000 sq. m., commercial centers in Sofia, Varna and Burgas, installing and service teams, HVAC academy and aerodynamic HVAC laboratory.

TANGRA is company with a sense of the typical values of the family-run corporations. July Armianov and Ivan Armianov are in charge of the business and management of the enterprise. TANGRA is run in constant striving for dvelopment of energy efficient equipment and projects, innovation, and last but not least – maintaining high quality standards.

We believe that our customers are our best advertisement!
Dipl. Eng. July Armianov

HVAC Design:

Well-trained specialists are engaged in the development and management of HVAC projects. Ongoing training and refresher courses allow the company’s team to meet all challenges in the field of design and offering energy efficient and cost-effective solutions. All projects comply with current European directives and standards. HVAC projects in 3D Revit can be executed at the prior request of the investor.

Development of complete project documentation and preparation of bill of quantity for project budget. Presentation of HVAC systems in winter and summer mode, day and night mode. Compliance of the selected equipment with the necessary certificates and the energy efficiency of the building. Coordination of all specialties to avoid problems in the implementation of the project.


We constantly strive for energy efficient equipment, high quality and sustainable project execution. Combining the most modern production equipment with trained professionals ensure excellent quality, short production terms and precision. Our production facilities are with specialized industrial production equipment for:

  • Air handling units
  • Mechanical heat recovery ventilation
  • Plate heat exchangers “air-to-air”
  • Centrifugal fans and ventilation equipment
  • Ventilation elements and air ducts
  • Ventilation grilles and diffusers
  • Ventilation grilles and diffusers

Installing and execution of projects:

The company has dedicated teams for installation of ventilation, air conditioning and heating systems, as well as control and automation (BMS).

The team of TANGRA takes care for the organization and deliveries of elements, execution and installation activities, according to the project schedule, provides tests of installations, supports the integration of HVAC systems to building automation (BMS), performs start-up and adjustment after completion of all construction activities.

Service and maintenance:

TANGRA company offers warranty and post-warranty service and maintenance of ventilation, air conditioning and heating systems, as well as local extraction systems. The company’s service teams are focused on maintaining the reliability of HVAC installations. Our experienced specialists are available 24/7.

Periodic inspections and maintenance of the equipment extend the life of the installations. For this reason, the company offers service programs and regularly makes preventive visits to the sites to eliminate in advance the possible causes of the accident.

Периодични проверки и профилактика на оборудването удължават живота на инсталациите. По тази причина, дружеството предлага сервизни програми за изпълнениете обекти и редовно прави профилактични посещения на обектите, за да отстрани предварително възможните причини за авария.

Sales list:

TANGRA is authorized representative for the territory of Bulgaria for:

  • Soler & Palau Ventilation Group – Domestic and Industrial fans
  • HITACHI Johnson Controls – Air conditioning equipment
  • YANMAR Energy Systems – Gas heat pumps and co-generation
  • AFS – Flexible ducts
  • Roen Est – Water heat exchangers
  • Nederman – Local extraction
  • Eliturbo – Air mixers
  • Grundfos – Circulation pumps


Based on years of experience and constant desire for improvement, the team of TANGRA created its own HVAC Academy. New products and individual solutions, technical details and renewal of F-gas certificates, changes in regulations, improvement of knowledge and skills are part of the goals and aims at the academy. “TANGRA HVAC Academy” trains and improves the skills of the company’s employees, but also offers HVAC courses for equipment installers, engineers, traders, project managers, builders and architects.

Specialized seminars for:

  • HVAC designers
  • Installers of air conditioning equipment
  • Installers of TANGRA pellet boilers
  • Installers of ventilation and air handling units with direct expansion
  • Control and building management systems (BMS)
  • HVAC Sales trainings
  • Product trainings

By learning more – we become better in our work, in our lives and in what we create!


In all activities of the company is implemented a quality control system ISO 9001 and environmental management system ISO 14001. In addition to these systems, the company’s management has a permanent policy to improve the quality of products and services to meet all needs of its customers and their business processes.