HOW UNITED SERVICES (W.L.L.) A Leading MEP Contractor in Qatar required the following; HVAC Technician – Installations. Applicants for all above MAP categories should have 4 years construction sites experience. Please send CVs with certificate. It is my pleasure and privilege to introduce How United Services (HUS) to you. Established in 2000 as an MEP Contractor, HUS is a joint venture between UK based Interserve Plc.; one of the world’s foremost support services and construction companies, and Al Darwish United; a highly respected Qatar based organization.