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Move your guinea pig indoors if you normally keep it outside. Avoid putting your guinea pig’s cage in any direct sunlight. Refrain from keeping your guinea pig in a shed or garage. Use fans and air conditioning to keep the cage cool. Use a thermometer next to the cage to monitor its temperature. Place ice packs or frozen water bottles in the cage. Consider partially covering the cage with damp cloths and towels.
The most effective way to keep your guinea pig safe from the heat is to move it from outdoors to indoors (if it isn’t already inside). The lower temperature inside your home will certainly help it stay cool, especially if you have fans or air conditioning.  Wherever you put your guinea pig, make sure it’s safe from any other pets or young children you have in your home. If you choose to place your guinea pig in the laundry room, refrain from running the washer or dryer while it’s in there. Guinea pigs are sensitive to loud noises and the machines will also give off a good bit of heat. If moving your guinea pig indoors isn’t an option, make sure the run is located in a shady spot and out of full sunlight. Being exposed to direct sunlight can cause the cage to rapidly heat to an uncomfortable temperature. Keep the cage in a shaded area of your home away from windows or under a small parasol. If you can’t bring the cage indoors, at least put it under a shady tree or under the roofing of your house.  Note that if wherever you put your guinea pig’s cage makes your guinea pig less visible to the naked eye, you’ll need to check on it more often just to make sure it’s ok. You can minimize the amount of sun that seeps through your windows by covering them with room-darkening curtains. The heat can be twice as bad in poorly ventilated places like these, especially as the humidity level rises. Wherever you choose to keep your guinea pig’s cage, make sure the location is well ventilated and has a good flow of air. Housing your guinea pig in a shed or garage can lead to death, so please take caution! If you’re using a fan, point it away from the guinea pig instead of directly onto it. Fans can help cool the air, but the feeling of having air constantly blown at it can stress out your guinea pig. Make sure the air in the cage doesn’t get too cold as a result of using air conditioning. Your guinea pig’s cage should never be colder than 50 °F (10 °C). Place a stand-alone or wall-mounted thermometer immediately adjacent to the cage to get the best reading of the cage’s internal temperature. Make sure this temperature stays between 65 and 75 °F (18 and 24 °C). This is the ideal temperature range for guinea pigs. Your guinea pig will enjoy lying down next to these items to cool off whenever it gets too warm. Plus, they help to insulate cold air in the cage. Gel cushions and cool tiles can also be used instead of ice packs or frozen water bottles.  Plastic water bottles can be filled with water and then frozen overnight. Wrap them in old tea towels or flannels and place them into the cage. Old tiles can be placed in the freezer to cool overnight and then put inside the cage for your guinea pig to rest on or near. Chilled gel packs can also be used as long as your guinea pigs won't chew them! The dampness can help insulate cool air in the cage as well as reduce heat stress. Rinse the cloth in ice-cold water and make sure you drain it off afterward. Make sure you only cover part of the cage to ensure that you can see the guinea pigs and they can see you. Avoid placing the cloth over the food bowl, as this can end up spoiling the food pellets in the bowl.