Introduction This article is just the first part of the complete Heating Ventilation and Air Conditioning. We will Learn HVAC from Basic to Advance level. So, Let's Start.. First We need to know what is meant by Building Services ? Building Sevices (MEP) : It is a branch of study/science where we want to impart or put various services such as electrical, mechanical, plumbing, or fire fighting in an "Energy Efficient Buildings", in order to get / fetch up the benefit of a luxurious lifestyle. Energy Efficient Buildings : Energy efficient buildings are those buildings where we want to use / consume energy in an efficient and disciplined way with respect to cheap and economic cost, to get the benefit of a luxurious lifestyle. Building Services can be categorized into three main classification, such as M - Mechanical and HVAC Design E - Electrical & Lighting Design P - Plumbing and Fire Fighting Design HVAC System : This system is used ...