You'll have to check the dimmer's wattage rating to see how many appliances it can handle. You also have to constantly monitor them since all they do is dial back the amount of electricity going to the heat pad, they don't adjust up or down as the ambient room temperature changes.
So, if you set it for 90*F with a room temp of 70*F and your request to dial back the A/C is granted, and you come back to a room temp of 76-78*F then your heat pad temperature will also have climbed by 6-8*F.
Lamp dimmers do have a place in your setup if you are using a cheap thermostat that usually fails wide open instead of off. Placed in between the thermostat and the heat pad, and set so the heat pad is around 96*F, they will prevent a failed thermostat from killing your snakes due to overheating. Your snakes will be uncomfortable for a while but they won't be cooked or suffer neuro damage.
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