High Density Polyethylene pipes are used in various applications due to the materials superior chemical resistance, pressure capability, and ductility. For the material to perform at the optimal design criteria, the connections and fabrications must be fused using repeatable procedures that specify proper fusion temperature, pressure, and process times that allow for the semi-crystalline structures to re-form to achieve appropriate material performance. With the growing acceptance of HDPE into markets dominated by traditional materials like steel, ductile iron, and PVC, improving job site productivity is a key objective to further demonstrating the benefit of using HDPE. Understanding the contribution of different parameters like heat time and ambient temperature is crucial to predicting when the joint has cooled adequately so the machine and operator may move to the next joint. The current industry standards using the single high force pressure method (ASTM F2620-13 and ISO 21307:2017 SHP) evolved from efforts to harmonize the welding procedures from multiple pipe producers and they are conservative given the expectation that the fusion operator must perform the fusion process consistently across a wide range of possible job site conditions. This paper explores the feasibility of accounting for applicable fusion parameters to accurately predict shorter cool times, therefore increasing jobsite productivity. It is recognized that any productivity improvements must not impair the mechanical performance of these joints, as measured by failure energy. This work demonstrates that the failure energy of the fusion joints remains constant whether cooled per the existing ASTM F262013 standard, reducing the fusion cooling time under pressure, or by altering the cooling rate based on ambient temperature conditions.