A Manual J calculation is the industry-standard method for determining the exact heating and cooling "load" of a home based on its size, insulation, and windows. This calculation is the most important step in selecting a new Mobile Home Complete System to ensure it is not oversized or undersized. An undersized unit will run constantly, while an oversized ACIq unit will short-cycle and fail to remove humidity. When browsing our Ductless Mini Splits or central units, having a Manual J report ensures you are buying exactly what your home needs. It accounts for factors like the R-value of your Belly Board and the orientation of your windows to the sun. Most local codes require a Manual J to be performed before an HVAC permit can be issued. It is the mathematical foundation for every efficient and comfortable home climate system. Taking the time to do this calculation can save you thousands of dollars in energy costs over the life of the unit.