An oven apparatus includes an oven portion and an oven controller. The oven portion has an upper chamber with an oven opening, a support platform having a void space in the center of the support platform for accommodating a rotary structure on which an object can be arranged, and a heating device is arranged in the upper chamber. The oven controller has a power module electrically coupled to an external power source for providing a power required for operation of oven apparatus, and a heating control module further having a first and a second heat control units electrically coupled to the heating device and the rotary structure, respectively, for controlling a temperature of the heating device and a temperature of the rotary structure, respectively. In addition, the oven apparatus further has a conduit assembly around the oven housing for recycling the emitted heat.