Heat is the biggest enemy of a custom PC build. An average CPU temperature should be within 75-80 degrees Celsius. Poor heat management can see temps climbing past 100 degrees resulting in slowing down becoming an indoor BBQ pit. To combat heat, current trend in Bangladesh is to build a PC with lots of RGB fans that light up like an 80's disco. More fans must mean more cooling, right? You're probably wasting your money doing it wrong. 

Get the correct air-flow direction

Goal is to bring cool air from the front or the bottom of a case, pass it across the heat generating GPU/ CPU and out through the back. Two fans are usually enough. Two more may see a max 2-3 degree drop in temperature. Benefit of any more fans is usually negligible. Keep in mind the GPU/CPU have their own fans which benefit from a well-designed airflow from the case fans.

Focus more on CFM than number of fans

Buy fans following the CFM (Cubic Feet per Minute) number. It measures the volume of air removed by the fan per minute. Higher the number, better the flow. A good 120mm 59CFM CoolerMaster RGB fan is around BDT 1300.

Balance your pressure

There's a science to it. Case fans act as either intake or exhaust fans depending on which direction they face. Intake brings in cool air (screwed if you're in hot, humid Dhaka). Exhaust fans get rid of hot air developed by your GPU while playing Call of Duty. I have seen a recent setup with multiple fans all blowing air outward. This creates a negative pressure inside with no cool air able to circulate inside. On the other hand, positive pressure happens when you have more cool air coming in than going out (two intake fans and one exhaust). Pro tip: It's okay to err a little on the positive side.

Invest in a better case

Good computer casings are not just for style points. They help manage your heat better. The only con being they are usually a bit on the large side. A proper case Phanteks will offer a large, unobstructed space for your airflow while keeping hard drives, power supply unit and cables neatly out of the way in separate modular compartments. These also have dust filters because as Spiderman said, "With great fans come great dust." Prices are around 5k-8k BDT for a mid-tower case. If you spend any more, you should expect your PC case to also cook your dinner and tie shoe laces.

Parting tip: Most builders mount a fan on the top as an exhaust. I've found fitting the top mounted fan as an intake works better to feed cool air to the CPU below (not suitable for liquid cooling).

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