Device to smooth out power consumption of a heat gun
If you control power to the heat gun via its power lead then your voltage reduction circuit will affect the fan speed.



Figure 1. Voltage reduction by triac phase-angle control.

To do what you want you would have to hack the heat gun and add a heavy duty light dimmer to the heat coil only. This will do phase-angle control via a triac and switch the heater voltage on part way through each mains half-cycle.







simulate this circuit &ndash; Schematic created using CircuitLab

Figure 2. Modification schematic.