WHY DO YOU NEED THE MANUAL REPORTS? The main goal of having these Manual reports performed is to increase your level of comfort in your environment. The Manual reports insure that your equipment and all of the other duct components will neither be undersized nor over sized. This is very important because if everything is not sized correctly a system will cost more to operate and will not function well. If the system is over sized it is less efficient and will have a tendency to break down since it will be turning on and off more than necessary.  If it is undersized the air will be too hot in the summer and too cold in the winter.   US Energy Department reports indicate that at least half of the HVAC systems in the country are not sized correctly. This is why the current International Residential Code (IRC) now requires Manual J and S compliance for all new construction.  Most of the cities throughout the US have now adopted the recent IRC codes and therefore require the reports to be submitted along with building plans for any new construction or major remodel projects.   We use ONLY software programs that have been approved by ACCA and ONLY those that comply with the current building codes. TECHNICAL MANUAL SOFTWARE: MANUAL D The Manual D is the process of designing the actual Duct System.  It is based on the Load that the Manual J determined as well as the Equipment that the Manual S selected. The Manual D will design the sizing of the supply and return ducts and the most efficient duct lay-out for them. This type of method insures a proper balanced design as opposed to just using a rule-of-thumb method for sizing the ducts. A balanced design is extremely important so that temperatures are consistent in all locations and so that excessive noise does not occur due to too much air velocity. MANUAL J The Manual J Calculation first determines the total volume of air, on a room by room basis, that needs to be heated and cooled.    As part of the Manual J Load Calculations all aspects of the thermal characteristics of every wall, floor, ceiling, door and window must be analyzed.  Other factors such as the home's geographic location, orientation to the sun, envelope tightness, duct leakage, lights and appliances are part of the analysis. The combination of all of these Manual J Calculations is referred to as the Load.  Also refereed to as the ACCA Manual J Calculation as it complies with the ACCA Manual J guidelines.  The Heat Load is the amount of work a system need to  maintain the right temperature. MANUAL S Based on the Heat Load calculations of the Manual J, The Manual S will determine a list of specific Equipment Models that will perform properly for that exact Load. There is a lot more to selecting the equipment than just dealing with the tonnage of the unit.  One manufacturer’s unit with the same ton output as another can very as to each ones capacity to remove heat and moisture from the air and how much total air, and at what pressure, their systems can produce.