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Our Services

Discover our installation, maintenance and repair services for all types of air conditioners.

Air Conditioner Installation

We provide professional installation of air conditioners tailored to your specific needs and space.

An industrial area with multiple air conditioning units placed along a narrow alley next to a large building. The wall is weathered and shows signs of aging with some wires and pipes directed toward the units. There is a metal railing, and the area appears somewhat neglected. The sky is clear with a light hue, and a distant view of rooftops is visible.
An industrial area with multiple air conditioning units placed along a narrow alley next to a large building. The wall is weathered and shows signs of aging with some wires and pipes directed toward the units. There is a metal railing, and the area appears somewhat neglected. The sky is clear with a light hue, and a distant view of rooftops is visible.
Preventive Maintenance

Our preventive maintenance services guarantee the proper functioning and longevity of your air conditioner.

Quick Troubleshooting

Immediate Intervention
A dimly lit alleyway displays a row of air conditioning units mounted on the walls above, with a parked white car and a small utility vehicle nearby. The area appears to be part of a commercial marketplace with various signs written in Korean, suggesting a business district.
A dimly lit alleyway displays a row of air conditioning units mounted on the walls above, with a parked white car and a small utility vehicle nearby. The area appears to be part of a commercial marketplace with various signs written in Korean, suggesting a business district.
A yellow building with multiple air conditioning units attached to its walls is situated along a narrow walkway. There are trees and plants surrounding the building, with palm trees visible in the background.
A yellow building with multiple air conditioning units attached to its walls is situated along a narrow walkway. There are trees and plants surrounding the building, with palm trees visible in the background.

Preventive Maintenance Plan Will Cover any age equipment

15% Discount on any repairs discovered while performing the maintenance or diagnosed during any regular service call. Two precision tune-ups and professional cleaning per yearconsisting of:

*Clean outdoor coil

*Clean indoor coil if accessible

*Clean and flush condensate drain

*Superheat/subcool measurement

*Replace filter media

*Check operating pressures

*Monitor starting capabilities

*Measure for proper temperature difference inside

*Check thermostat

*Tighten all electrical connections

*Monitor voltage and amperage of motors

*Leave a record of all procedures performed

*Priority custumer

*Agreement is tranferable to new owners

*Help maintain efficiency

*Help prevent system failures

*Help maintain capacity

*Satisfaction guaranteed

*24-hour answering service

*Overtime rates apply after

normal business hours

*Help maintain efficiency

*Diagnostic fee is not subject to the 15% discount

*10% discount on additional systems at same location.

This agreement does not cover duct systems, supply & return grilles,

thermostats, humidistats, electronic air cleaners, specialty air filters,

ultraviolet lights or repairs caused by rust or corrosion.

contact@cornerstone77.com

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Phone : 23 9 474 6124