If it is an exo terra mat it will not produce enough heating. I had serveral once including desert but never got my temperature up. You want to buy an infrared 15W-20W heatmat. In my 45x45x45 vivarium with a 14W heatmat temperature goes up to 27.4 degrees with a thermostat @27 degrees. Make sure to have a thermostat or else you'll fry the frog.

My mat is attached to one side of the vivarium(it was attached by tape to see if it is good enough to heat the terrarium). Make sure to have all the heatmat surface in contact with the glass of the vivarium or you will loose thermal conductivity.

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