This issue is directly linked to the origin of your tarantula: If it was captured in the wild or if it has been bred in captivity. Find out where your tarantula is from. However, regardless of its origin, they can usually live comfortably at temperatures ranging from 18 to 30 degrees Celsius. The only areas where there are no tarantulas are those where it snows most of the year.
In spite of what is commonly said, it is important for your tarantula to experience the changes of the outdoor seasons as it would normally do in the wild.
Out in the wild, they can choose the part of their den they want to be in, always looking for a temperature close to 25 degrees Celsius. This is why I insist on a large and deep terrarium.
Never purchase a resistor or a rock with a heating resistor to increase the temperature in your container. I have heard of terrible cases where the tarantula dehydrates due to the excess heat they are forced to live in. I would only recommend using a heating resistor in places where the day-time temperature is lower than 15 degrees Celsius, and I would tell you to place the resistor only on a vertical side of the container, so they can have the option of choosing their location according to their needs. Remember that the higher the heat, the higher the evaporation rate in the terrarium, so you must always keep this under observation.
Do not leave a fish tank or container unattended with a resistor on. This oversight could prove fatal.
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