How IRFZ44N can be used with arduino to implement pid based temperature control system?
Is it used to change the speed of 12 V fan (Fan which is used to reduce temperature)?? or it cannot change speed of motor of 12 V fan ?
Or it is used to adjust the brightness of 12 V Lamp/bulb that is used to increase temperature?
It can be used in either/both cases.
Short answer: NOT without a MOSFET driver 
Better use a logic level MOSFET like IRLZ...
What is MOSFET driver here in this scenario? Isn't it IRFZ44n??
Also please write the full IC number ? after IRLZ...
It depends on the maximum load current.
in case of 12 V Load like a DC fan??
Use a DMM and measure the current.
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