Gas pack units also known as gas package units are similar to package air conditioners except that they include a gas furnace system for heating instead of electric heat strips. Gas pack system are typically installed on rooftops but are also popular in condos, apartments and commercial buildings. All of our gas pack units ship free and come pre-charged with the new eco-friendly R410-A refrigerant. We also include lift-gate service for your convenience. If you need help selecting the right gas pack system for your home or have questions, please contact us at (888) 292-0874 and customer service representative will assist you.