Adding air conditioning to a JD 3300 combine

Was wondering what would be the best way to add air conditioning to my 3300 combine? I'm allergic to all the dust so having the doors open doesn't work so well because everything inside the cab gets covered with dust and with the doors closed it gets smothering hot inside the cab. It has a fan but all it does is blow dust filled hot air around.

Adding air conditioning to a JD 3300 combine