Keep Your PC Cool This Summer: The 2026 Airflow Guide

Summer is coming, and with it come 28°C rooms and gaming sessions where your PC sounds like a hair dryer. The ambient temperature directly influences your machine's internal temperatures: every degree gained in the room is reflected inside the case. Here is how to optimize your PC's airflow to get through the hot season without throttling or excessive noise.

Understanding airflow: the basics

A well-ventilated case works like a tunnel: cool air enters from one side, passes through the hot components, and exits from the other. The classic—and in the vast majority of cases, the most efficient—layout is as follows:

• Intake: fans at the front and potentially at the bottom of the case, which draw in cool room air.
• Exhaust: one fan at the rear and one to two at the top of the case, which expel the heated air. Since hot air rises naturally, the top of the case is the most logical exit point.

Positive or negative pressure?

We refer to positive pressure when the incoming airflow exceeds the outgoing airflow, and negative pressure in the opposite case. Slightly positive pressure is generally preferable: air enters through the filtered fans rather than through the case's unfiltered gaps, which limits dust accumulation. In practice: three intake fans to two exhaust fans is a good starting point.

Step 1: check your temperatures

Before changing anything, measure. Download HWiNFO64 (free) and record the following temperatures after 30 minutes of gaming:

• CPU: under 80°C under load, everything is fine. Between 80 and 90°C, there is room for improvement. Above 90°C, the processor reduces its clock speeds (throttling) and you lose performance.
• GPU: under 75°C, excellent. Between 75 and 83°C, acceptable. Above that, the card also throttles. Also monitor the hot spot, which can exceed the average temperature by 10 to 15°C—this is normal, but it must remain below 100°C.
• NVMe SSD: preferably under 70°C. SSDs slow down significantly when they get too hot.

Step 2: the big cleaning

This is the most cost-effective operation there is, and it is free. Dust acts as a thermal insulator and clogs filters.

• Turn off the PC and unplug it completely.
• Take it to a ventilated area (balcony, garage)—avoid blowing dust into your room.
• Remove the dust filters and wash them with lukewarm water. Dry them completely before putting them back.
• Dust off the fans and radiators with compressed air, holding the blades with a finger to prevent them from spinning freely (bad for the bearings).
• Focus on the CPU cooler radiator and the GPU fins, where dust packs together.

Cleaning every three to six months is sufficient in a normal room; every two months if you have pets or carpet.

Step 3: optimize fan placement

A few golden rules for assembly:

• Identify the flow direction: air exits from the side where the frame reinforcements (the protective grille) are located. A molded arrow on the edge often indicates the direction.
• Front = intake, rear/top = exhaust. Do not mount a front fan as exhaust; you will break the air tunnel.
• Do not saturate the case: beyond six fans, the gain becomes marginal. It is better to have three good, well-placed fans than seven in disorder.
• Let the front breathe: a closed desk or a wall 5 cm from the front panel suffocates the intake. Leave at least 15 cm of free space in front of and behind the case.

Step 4: set fan curves

Fans do not need to run at full speed all the time. In the BIOS/UEFI (Delete or F2 key at startup), in the Q-Fan, Smart Fan, or Fan Control section depending on the brand:

• Below 50°C CPU: 30 to 40% speed—near total silence at idle.
• From 50 to 70°C: gradual increase from 40 to 70%.
• Above 75°C: 80 to 100% to handle summer spikes.

Set case fans based on CPU temperature or, better if your motherboard allows it, on GPU temperature for fans near the graphics card.

Step 5: bonus optimizations

Cable management

Loose cables in front of fans disrupt airflow. Route cables behind the motherboard tray, use the case's velcro straps, and clear the area between the front panel and the graphics card.

GPU undervolting

Slightly reducing the graphics card's voltage lowers its power consumption and heat with minimal performance loss. We have published a dedicated tutorial on GPU undervolting on this blog if you wish to go further.

The room itself

Shutters closed during hot hours, PC away from sunny windows, and if possible, gaming sessions in the evening rather than at 3 PM in the middle of a heatwave. A room fan directed at the front of the PC can also gain a few degrees during extreme heat.

Summary checklist

Conclusion

A PC that breathes well is a quieter, more stable, and more durable PC—summer and winter. Most of the optimizations in this guide are free and can be completed in an hour. If you prefer to start on a sound foundation, DSGate PCs are assembled in France with airflow considered from the start of the build: balanced ventilation, clean cable management, and components tested under load before shipping.

Discover our gaming configurations on dsgate.fr.