Adjustable transition for accessing box coils

A method of accessing box evaporator coils, the method comprising:

• opening an access panel located on a transition having a first opened end and a second opened end located opposite of the first opened end, wherein the first opened end securably aligns with an opened end of a furnace, and the second opened end securably aligns with one opened end of a box housing the box evaporator coils;
• and
• extending a member through the access panel for interacting with the box evaporator coils.

A method of transitioning within an air conditioning system, the method comprising:

• positioning a first opened end of a box to meet at a perimeter of an opened end of a furnace, wherein the box has a first portion and a second portion, wherein the first portion houses box evaporator coils, wherein the second portion comprises a transition integrally connected to the box, and wherein the box evaporator coils are accessible via an access panel located on the transition;
• and
• securing the transition of the box to the perimeter.