A:AnswerI’d suggest a curtain on that window (blackout curtain) to minimize heat. For your specific question you don’t absolutely need to vent out a window... buttttt when the machine cools... it blows out hot air from the vent. Btw if you do decide to get one.. they’re awesome I have two!!
A:AnswerHi,
After looking for this information for you, I learned that the exact diameter is not included in any of the paperwork available for this unit. If you want to get this information you can either measure the hose or give us a call at 877-467-4289 so we can continue assisting you and look for further options to get this information for you.
Adolfo M. - Insignia Support
https://www.insigniaproducts.com/contact-us
A:AnswerIf you're not using the window vent, you're just blowing the hot air from the condenser unit into the room. If you are using the vent properly, I would contact Best Buy about replacing the unit.