Some of the signs your chin is in trouble from to warm a temperature or exhaustion:
1. Pink or redish ears or veins more obvious in the ears than normally ... this is often hard to see in chinchillas that have dark ears like the black velvets and standard grays. We as humans sweat to help cool our body ... chinchillas do NOT sweat, they cool their body through their ears and a little through their feet. Their thick fur helps keep their body heat in and the outside cold out. The temperatures a chin can withstand are generally between 45 F and 74 F ... these are the extreams. Their comfort zone is usually between 65 F and 70 F.
2. Panting is a sign of exhaustion and/or stress. Panting in a chin is usually seen after/while being very active OR in a pregnant female chinchilla in labor while delivering her kits.
3. Lethargic ... Not being playful, sitting unusually still for a long period or time and or dull eyes ... this is a sign your chin could be over heated, but is also often a sign of injury or illness. Never ignore the sign of lethargy in a chinchilla.
4. When you are holding the chin, you can over heat it by transferring your body heat to the chin by holding it to long and or in a manner where most of it's body is covered by your hands and or body. Your body heat is transferred to the chins fur, and into the chinchilla itself.
5. It's ears and feet should never feel warm to your touch. Your face and/or neck can often judge temperature better than even your hands.
6. A chinchilla that is overheated or sick will often become irritable and not want to be handled. Never ignore this.
There are several ways to help cool your chinchilla. Some are safer than others ...
1. We keep our home temperature at 67 to 68 F year round ... rough on the summer billing, but helps greatly on the winter bills.
2. Buy two chin-chillers, keep both in the refrigerator. Use one at a time, swapping them out as needed.
3. You mentioned a high humidity. Get a dehumidifier, please. High Humidity greatly affects a chinchilla in a bad way. A good way to gauge the proper comfortable temperature for a chinchilla is to add the humidity number to the temperature number ... IF they = 150 or more, it is to warm for your chin, especially one that is out playing. Example: Room Temperature is 74 F and room Humidity is 85%. 74 + 85 = 159 This is over the acceptable 149 total.
4. Buy a few mason jars. Fill them with ice cubes and keep them in the freezer ... Do NOT fill with water, then freeze, they can break that way ... Place metal lids on the jars filled with ice cubes and place the jar in the cage. Do not use plastic jars. When your little one is out playing ... keep a jar of ice cubes out in a metal shallow cooking sheet pan or metal cake pan, placed in a convenient place on the floor for your chin. He/she will go stand close to it to get use of the cool air around it AND can lick the cold droplets of condensed water off of the outside of the jar.
5. Using water to cool a chin is acceptable, but only in an emergency. The chin must be thoroughly dried with a towel and paper towels a.s.a.p. A chinchilla can become chilled if left wet ... a chilled chin can often be in as much danger as one that is to hot.
6. We as humans sweat/perspire. When the breeze from a fan come in contact with the water on our bodies, it evaporates the water cooling the body. Chinchillas can not sweat or perspire, a fan does not help them and can hurt them. Always keep your chin away from fans and air ducts.
7. Never place or house your chin in an enclosed area such as an aquarium. There will be a heat build up from the chinchilla's own body heat, not to mention the fumes from the urine and poop. Chinchillas must have fresh air. No air can properly circulate naturally in a small enclosed area. A chinchilla needs to be in a cage that is enclosed with wire that can allow the normal flow of air in in the room in and out of the cage naturally.
8. Never place a chin's cage where the direct sun beams can shine on the cage or the chinchilla. A chin's cage should always be placed in an area OUT of direct sunlight. The sun beams shining through a glass window will heat anything it shines on. Even a few degrees can make a huge difference for a chinchilla.
9. When traveling with a chinchilla, never, ever leave it in an enclosed car while you run in the store to get something or to get a bite to eat. The inside temperature of a car on a sunny day that it is 70 F can soar to 90+ F in just a few minutes. You do not want to return to find a dead chin. Plan on going through drive thous to get something to eat.
10. When transporting a chinchilla, do NOT place the cage on the floorboard of the vehicle. Place it in an area that is off of the floor and where no sunbeams will hit it during the trip. The equipment that runs the car often heats the floor of the car. The sunbeams coming through the window will over heat the chin.
Hope this helps!
Jo Ann