There shouldn't be any mess, smell or noise from one piggy. If there is mess then the cage walls are not high enough, if there is any smell then the cage is not being cleaned out enough and if there is any noise what is causing it in the middle of the night? Usually if you pop a sheet over the cage and turn the lights out they won't week until morning for veggies.
Guinea pigs don't do well in temperatures over 35° my piggy got heat stroke at 30° it only takes minutes for them to turn floppy and unresponsive. The best thing is to spray them with water, leave an ice pack in the cage covered by a towel, use a ceramic tile large enough to lay on which has been in the freezer. Place a frozen towel over the cage, freeze tin cans place outside of cage and make ice cubes for licking, makesure your piggy has watery veggies and a hair cut if they have long hair.