YOİ Mühendislik and LG air conditioning flags

Maintenance tenders and corporate contracts

We bid on AC, chiller, VRF and ventilation maintenance and repair tenders of public institutions and large businesses, and deliver service in line with the specification throughout the contract.

In shortYOİ Mühendislik bids in public-sector and private-sector HVAC maintenance and repair tenders and provides service under annual contracts. With the TSE Service Competence Certificate, ISO management system certificates and OHS-trained staff, all documents required for a tender file are ready.
Free maintenance and service forms (PDF)
Chiller, fan coil unit, AHU, VRF, air conditioner, precision air conditioning, refrigerant leak check and technical service forms.
See the forms

About public tenders and corporate contracts

In public tenders, the technical specification defines the equipment inventory, maintenance intervals, response times, spare parts scope and reporting format. Strict compliance with these terms throughout the contract keeps progress payments and acceptance running smoothly. Our team, which has served public institutions for many years, can also provide technical input while the specification is being prepared.

Scope of service

  • Bids for maintenance and repair tenders
  • Maintenance forms that comply with the specification
  • Equipment inventory and labeling
  • Monthly and periodic reporting
  • Progress payment and acceptance documentation
  • Written response time and on-call service
  • Multi-site service across Türkiye
  • Technical input for specification preparation
YOİ Mühendislik team checking a chiller in a public building
Maintenance forms and reporting that comply with the specification.

Documents ready for your tender file

CertificateScopeStatus
TSE Service Competence Certificate (HYB)HVAC servicesReady
ISO 9001 · 14001 · 45001 · 10002Quality, environment, OHS, customer satisfactionReady
OHS trainingField staffReady
Authorized service certificateLGReady
References and work experience recordsPublic and private sectorOn request

Buildings we serve

Ministries and public institutionsMunicipalityUniversityState hospitalDefense industryState-owned enterprise

Our base is in Ankara Etimesgut. We provide public tender and corporate contract services daily in Ankara, and on a project and contract basis in all 81 provinces of Türkiye, including İstanbul, İzmir, Bursa, Antalya, Konya, Kayseri, Eskişehir, Kocaeli, Adana, Gaziantep, Samsun and Trabzon. See our service areas.

Frequently asked questions

What types of tenders do you take part in?

We bid on maintenance, repair and spare parts tenders for air conditioners, VRF systems, chillers, fan coil units, air handling units, precision air conditioning and ventilation systems.

Can you serve organizations in other provinces?

Yes. We are based in Ankara; for contracted work, we organize teams for every province in Türkiye.

Do you help with preparing specifications?

On request, we provide institutions with a technical opinion on the inventory and maintenance needs of their existing system.

From 1 unit to 1,000 units, from a single provider.

Sales, installation, maintenance and repair for all brands and equipment. Nationwide across Türkiye.