Of course it is up to you but we leave our 3 vents and a couple of windows open during the summer months. Our RVs have always been stored at home, plugged in with batteries fully charged and fridge running for any whim departures during active RVing season. If someone is staying over we will run RV ACs for as long as needed, we don't fret the electric bill or the fuel bill, why would we even have an RV if that was the case.