Our installation process is very unique unlike other competitors in the industry. We only use metal transitions that we seal and insulate. We replace any electrical wiring or connections that may be unsafe and not to code. After installing the new system we always pressure test to operating conditions, and soap test for any small unnoticeable defects on the brazed connections. Most importantly we vacuum all of our systems to 499 microns or less. With a vacuum this deep, it is scientifically impossible for any moisture or air to be present in the virgin Freon lines. The lines that feed Freon from your new outside unit to the new indoor unit.