20kHz oscillator was applied in order to reduce the danger of electromagnetic wave. Out coming wind is controlled by temperature of 50℃ in order to keep the condition of plants in the green house. We developed high frequency induction fan heater which have a power of 10kW and a heat transfer. If we use a diesel heater, it absorb oxygen gas and emits harmful gases in the night. Also emitted CO2 gas could not helpful for crops in the night. This HF induction fan heater was applied to the strawberry, the hot pepper and mushroom green house in Nonsan area, and got a production increasement and reducement of heating cost.