1) A dew heater like the Altair RC or Split Newtonian heater to GENTLY heat the front face of the camera and this usually clears it. There is no need for excessive heat because it will impair the camera performance.
2) Slower or less aggressive TEC cooling can allow the small built-in heaters more time to keep up with the TEC cooling. Dewing is less likely if you cool the sensor less. In fact, with most CMOS sensors, cooling to below -10C does not really give any benefit in noise reduction after stacking – it just increases the risk of dew and more power being used, with more stress on the components.