Grade Cool is one of the Best Aircon service company in Singapore. Have 20 years of Experience in Aircon cleaning, Aircon installation, Aircon repair and Aircon servicing in Singapore. Grade Cool is one of the trusted Aircon Service company in Singapore. We provide all kinds of Aircon maintenance services, aircon servicing, aircon repair and aircon installation at very affordable prices. VRV is a technology that alternates the refrigerant volume in a system to match a building's precise requirements. It help to save energy.