There are times when we go camping that we can not run the A/C, however, we always have at least 4 fans going inside the camper. Dually tolerates the heat and humidity very well and is outside for long periods of time. Like I said, we have the kiddy pool filled at all times, water for him to drink and shade. If its just unbearable outside we put him inside with the A/C or Fans blowing on him. I know he doesn't look like it but he is a very active bulldog! Hope this helps!!