YOİ Mühendislik technical team walking toward rooftop HVAC units

Annual maintenance contract

From 1 air conditioner to 1,000 units: all your equipment under one contract, one schedule and one report. Your breakdown priority is written into the contract.

In shortAn annual maintenance contract is an agreement covering scheduled maintenance of all HVAC equipment in a building, priority response to breakdowns and spare parts at fixed terms. YOİ Mühendislik contracts include an equipment inventory, measurement history and a written response time.
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 the annual maintenance contract

The goal of contract maintenance is to prevent breakdowns, not wait for them. At the start of the contract, all units are inventoried, each is assigned a maintenance schedule, and every visit is reported with measurements. Your budget is fixed at the start of the year and unexpected costs go down.

Scope of service

  • Equipment inventory and labeling
  • Scheduled periodic visits
  • Priority breakdown response with guaranteed response times
  • Contract pricing on spare parts
  • Measurement history per unit
  • Annual efficiency and condition report
  • Critical parts stock plan
  • One invoice, one point of contact
YOİ Mühendislik engineers performing a contract maintenance check in a chiller plant room
At contract facilities, every visit closes with measurements and a report.

Contract options

PlanScopeSuitable facility
Koruma Plus2 visits per year, priority on breakdownsOffice, retail, school
Koruma 24/74+ visits per year, on-call team, written response timeHospitals, data centers, factories
Corporate / multi-siteOne contract for branches in different provincesRetail chains, banks, public sector

Buildings we serve

Public buildingHospitalOffice towerHotelFactoryChain store

We are headquartered in Etimesgut, Ankara. We provide annual maintenance contract service daily in Ankara, and on a project and contract basis across 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

How is the contract price determined?

It is based on the number and type of units, visit frequency, operating hours and required response time. We provide an itemized quote after the site survey.

Can equipment from different brands be covered under one contract?

Yes. Because we are brand-independent, all your equipment is covered under one contract.

Are spare parts included in the contract?

Consumables (filters, belts, etc.) can be included; major parts are invoiced separately at discounted contract prices.

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

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