Terrariums are interesting pet environments. They are built for reptiles so it has to provide the necessary heat and humidity for reptilian pets to thrive. Unlike mammals or bird pets, reptiles get their heat for internal biological processes from external sources. In the wild, most reptiles would bask in the sun to get enough UVB and UVA rays to stay healthy.
In a terrarium setting, their owners have to provide it for them. Normally terrariums have overhead heating, and for most practical purposes this is enough. However, if you live in northern climates and it could get quite cold, overhead heating might not be sufficient. You might need to look for heating that comes from below called under tank heating.
If you live in an area that has really harsh winters, while your pet is getting adequately heated from above, the water and liquid at the bottom of the terrarium might get really cold because of the ambient low temperature. In essence, your pet is hot and cold. It's hot at the top and very cold at the bottom. This could be quite unhealthy.
Thankfully there are products that heat your pet from under the tank. One of these is Four Paws Natures Heat Under Tank Heater from Pet Store. It goes under your terrarium tank and gives your reptiles and even small animals like guinea pigs, rodents, rats and small bunnies, the necessary warmth they need to weather harsh winters. For reptiles, this is very crucial because they need internal heat for digestive processes.
The Four Paws Natures Heat Under Tank Heater is very safe because there are no wires that stick out that might harm your pet. If you're looking for a great under tank heater solution, try the Four Paws Natures Heat Under Tank Heater pad.
Four Paws Nature’s Heat Under Tank Heater (Economy, Large, 9 Inch L x 6 Inch W)
Four Paws Nature Heat Under Tank Heater is highly recommended to provide a happy and healthy environment for reptiles, lizards, and small animals. It helps their digestive system and prolongs their life. It gives them the warmth and comfort that nature usually provides them.*UL approved cord for safety and reliability. *Flexible pad with two peel off adhesive surfaces to provide optimal heat placement in hard to reach areas.Specifications: Large - 9 Watts, 6in x 9in, use with 10-55 Gallon Tanks *May use 2 heaters for 20 gallon tanks or larger!