Brands
we service

LGDaikinÜntesMitsubishi ElectricRhossCarrierAlarko CarrierYorkTraneStulzHirossLiebertClimavenetaLennoxSamsung
All of Türkiye · since 2009

From a single AC to a 1,000-unit facility, maintenance and repair from one provider.

From the split air conditioner in your home to the chiller plant of your hospital, the same team installs, maintains and repairs equipment of every brand. Even as your number of units grows, your point of contact stays the same.

  • 2009in business since
  • 81 provincesprojects and contracts
  • 55+brands serviced
  • 7/24breakdown line

Certificates · TSE HYB · ISO 9001 · 14001 · 45001 · 10002 · OHS

Technical team with YOİ Mühendislik on their backs walking toward rooftop AC units
YOİ Mühendislik engineers carrying out checks in a facility plant room
YOİ Mühendislik technician taking measurements with a manifold on an outdoor unit
YOİ Mühendislik technician servicing an indoor unit in an office
24/7 breakdown line active
From 1 unit to 1,000 units

As your facility grows, your team stays the same.

The team you call for a single air conditioner manages the annual maintenance of a facility with hundreds of units with the same care. Every unit's records, measurements and reports are kept in one place.

1

Single point of contact

Whatever the brand or equipment, one phone number and one project manager.

1

One contract

All your equipment, from split air conditioners to chillers, under a single maintenance contract.

1

One report

Measurements are recorded per unit at every visit, and you receive the report in a single file.

How can we help?

Three needs, three easy options

Our services by equipment

What do we do on each type of equipment?

We provide breakdown repair, scheduled maintenance, and sales and installation for all of the systems below, regardless of brand.

EquipmentBreakdown repairMaintenance and contractsSales and installation
Central systems
ChillersBreakdown repair: yesMaintenance: yesSales and installation: yes
VRF / VRV systemsBreakdown repair: yesMaintenance: yesSales and installation: yes
Fan coil unitsBreakdown repair: yesMaintenance: yesSales and installation: yes
Air handling units (AHU)Breakdown repair: yesMaintenance: yesSales and installation: yes
Rooftop unitsBreakdown repair: yesMaintenance: yesSales and installation: yes
Residential and commercial AC
Split and multi-split air conditionersBreakdown repair: yesMaintenance: yesSales and installation: yes
Cassette and ducted air conditionersBreakdown repair: yesMaintenance: yesSales and installation: yes
Heat pumpsBreakdown repair: yesMaintenance: yesSales and installation: yes
Critical and industrial
Precision air conditioning (data centers)Breakdown repair: yesMaintenance: yesSales and installation: yes
Cold rooms and process coolingBreakdown repair: yesMaintenance: yesSales and installation: yes
Ventilation systemsBreakdown repair: yesMaintenance: yesSales and installation: yes
Car park jet fansBreakdown repair: yesMaintenance: yesSales and installation: yes
Have equipment that is not on the list? Send us a photo and we will take a look.Message us on WhatsApp
YOİ technician measuring pressure with a manifold on a VRF outdoor unit YOİ engineers in a chiller plant room YOİ technician servicing a split air conditioner
Our field team

A team that shows up and knows the job

Our technicians arrive in company uniform with measuring instruments and safety equipment. They explain what they are doing and record what they measure.

OHS-trained staff

Safe work on rooftops, in plant rooms and at electrical panels.

Written report with measurements

Pressure, current, temperature and superheat values are recorded at every visit.

Repair option first

Before replacement, we tell you in writing whether the unit can be repaired.

Authorized service and sales

Warranty service as an LG authorized service and sales point; repairs with original spare parts.

Maintenance plans

YOİ Protection: choose the plan that fits you

An unmaintained system uses more energy and stops on the hottest day. Scheduled maintenance catches faults before they happen.

One-time

Seasonal Maintenance

Homes, small offices and one-off needs.

1 visit · no contract
  • Chemical cleaning of indoor and outdoor units
  • Filter, drain and drain pan check
  • Refrigerant pressure and current measurement
  • Written maintenance report
Book an appointment
Most popularAnnual contract

Koruma Plus

Offices, retail stores, schools and businesses.

2 visits a year · before summer and winter
  • Everything in Seasonal Maintenance
  • Priority breakdown response
  • Contract pricing on spare parts
  • Measurement history per unit
Get a contract quote
Critical facility

Koruma 24/7

Hospitals, data centers, manufacturing, public buildings.

4+ visits a year · on-call team
  • Everything in the Plus plan
  • Written response time commitment
  • Critical spare parts stock plan
  • Oil analysis and vibration monitoring
Request a site survey
Which plan suits you?Tell us how many units you have, and our engineer will recommend the right plan for you.
Compare plans side by side
What is included?SeasonPlus7/24
Cleaning, measurements and a written report✓✓✓
Scheduled periodic visit—✓✓
Priority for breakdowns—✓✓
Contract pricing on spare parts—✓✓
Written response time and on-call team——✓
Oil analysis, vibration monitoring, spare parts planning——✓

Annual maintenance contract details · Public maintenance tenders
The number of visits and the response time are agreed in the contract based on the number of units and operating hours.

How we work

Four steps from request to report

01

Contact us

WhatsApp, phone or form. Same-day response.

02

Site survey and diagnosis

Our engineer takes on-site measurements and inspects the unit and installation.

03

Written quote

Itemized quote. Repair and replacement options side by side.

04

Execution and report

The job is completed and measurements are handed over in a report.

Why YOİ

A team trusted from the public sector to the defense industry

The documents required for corporate procurement are ready and can be added directly to your tender file. Maintenance tenders →

TSE HYBISO 9001ISO 14001ISO 45001ISO 10002OHS trainingLG Authorized Service
2009in the field since
55+brands serviced
4ISO management system certificates
81provinces served on a project basis

Public sector

  • TBMM (Grand National Assembly of Türkiye)
  • SGK (Social Security Institution)
  • TÜİK
  • Directorate of Communications
  • TRT · TCDD · PTT

Defense and R&D

  • FNSS
  • Roketsan
  • Meteksan Savunma
  • TÜBİTAK
  • Hacettepe Teknokent

Healthcare

  • Hacettepe Hospitals
  • Medical Park
  • Lokman Hekim
  • TİTCK
  • Turkish Red Crescent

Industry and energy

  • Eti Gıda · Eti Maden
  • Akenerji · Socar
  • Arçelik · Vestel
  • ORS Rulman · Petlas

Education

  • METU (ODTÜ)
  • TED Atakent College
  • Ankü Koleji

Commercial buildings

  • Cepa · Gordion · Göksu shopping malls
  • Hilton DoubleTree
  • EY Türkiye
  • Koç Sistem · Philips
Report a breakdown · Get a quote

Fill in the form and send it via WhatsApp

When you press Send, your details become a ready-made WhatsApp message. If you attach a photo of the unit and its nameplate, the team will arrive with the right part.

Request form

FAQ

Frequently asked questions

The most frequently asked questions about breakdowns, maintenance and sales. If you cannot find what you are looking for, write to us.

Do you also come out for a single air conditioner?

Yes. The same team comes for maintenance or a breakdown on a single AC. We respond to home and small office requests the same day.

Which cities do you serve?

We are headquartered in Ankara. We provide daily service in Ankara and nearby provinces, and send teams to every province in Türkiye for corporate maintenance contracts and projects.

We have equipment from different brands. Can you service all of it?

Yes. We are an LG authorized service, and we work as an independent service provider on more than 55 brands, including Daikin, Mitsubishi, Carrier, York and Trane. All your equipment can be covered under one contract.

Is there a charge for the site survey and quote?

There is no charge for the site survey for sales, project and maintenance contract quotes. For fault diagnosis, the fee is deducted from the total if you approve the repair.

What certifications do you hold?

We hold the TSE Service Competence Certificate, ISO 9001, ISO 14001, ISO 45001 and ISO 10002; our field staff have occupational health and safety training. We are an LG authorized service and sales point.

My AC is not cooling. What should I do?

First check the mode and temperature settings, make sure the filter is clean and the area in front of the outdoor unit is clear. If the problem persists, send a photo of the unit and any error code via WhatsApp; with a preliminary diagnosis, we arrive with the right parts.

How quickly do you arrive after I report a breakdown?

In Ankara, visits are usually scheduled the same day or the next day. For critical facilities under contract, the response time is committed in writing in the contract. Our breakdown line is open 24/7.

Is sending the error code enough?

The error code and the equipment brand and model are usually enough for a preliminary diagnosis. If you also attach a photo of the nameplate, the team will arrive with the part most likely to solve it on the first visit.

Do you give a price before repairing?

Yes. A definitive diagnosis is made with on-site measurements and the repair cost is given in writing; no work begins without your approval.

Is the repair covered by a warranty?

Replaced parts are subject to the manufacturer's warranty terms; we also provide a separate warranty on our workmanship. The warranty period is stated in writing in the quote.

Can a chiller compressor be repaired without replacement?

In most cases, yes. Bearing, rotor, valve and winding faults in screw and reciprocating compressors can be fixed with an overhaul. We quote the overhaul and replacement costs side by side.

How often should an AC be serviced?

Once a year is recommended for homes and twice a year for offices and stores. For VRF systems, chillers, AHUs and precision air conditioning, maintenance intervals are planned between monthly and every six months depending on usage.

What is done during maintenance?

We clean the indoor and outdoor units, check filters and drainage, measure refrigerant pressure and superheat, measure compressor and fan current, and check electrical connections. A measured report is provided for each unit.

What is the advantage of an annual maintenance contract?

Provides scheduled visits, priority breakdown response, contract pricing on spare parts and unit-by-unit measurement history. Your budget is fixed at the start of the year and unexpected costs go down.

How is the price of a maintenance contract determined?

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

Do you bid on maintenance tenders of public institutions?

Yes. We take part in HVAC maintenance and repair tenders and provide service with specification-compliant maintenance forms, reporting and progress payment documentation.

What happens if I skip maintenance?

Dirty filters and coils reduce efficiency and increase energy consumption; odors, water leaks and, over time, the risk of failure in expensive parts such as the compressor all rise.

Which brands do you sell?

We are an LG authorized sales and service point. Depending on project needs, we also supply equipment from other brands and provide comparative quotes.

How do I know how many BTUs of AC I need?

It depends on room area, orientation, glazing, floor and intended use. We calculate the heat load during the site survey and recommend the right capacity; an undersized or oversized unit reduces both comfort and service life.

How long does installation take?

Split air conditioner installation is usually completed the same day. For VRF, chiller and AHU projects, the duration is planned according to project size and stated in writing in the quote.

Do you remove the old unit and install the new one?

Yes. We handle refrigerant recovery, removal, waste management, and installation and commissioning of the new system together.

Should I choose VRF or a chiller?

It depends on building size, usage, existing installation and operating cost. VRF is often preferred in offices and hotels, chillers in large hospitals, shopping malls and process facilities; we compare both options during the site survey.

Who handles the warranty and service for the unit I bought?

Units are covered by the manufacturer's warranty. As an Authorized Service for LG, we handle warranty procedures for LG units; for other brands, we follow up the process as the installation team.