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The original was posted on /r/stationeers by /u/Shadowdrake082 on 2025-10-25 18:59:54+00:00.

Greetings, with the release of the HARM suit, we have a new suit that sports a superior ability to keep you cool. Probably useless on the cold planets unless you create a furance room pressurized past 100kpa and kept at 1800C for making stellite… dont know why you would want to do that but hey… options. To see how it performs as well as its niche I decided to run some tests comparing this suit to the EVA suit and Hardsuit. Devs stated the HARM suit was meant to be a great cooling solution that helps to negate the effects of extreme solar heating. Now looking at the different atmosphere worlds… solar heating isnt large. It does have an effect but it is hard to gauge when the EVA suit does not have logic to read from and without knowing the surface area or other factors for how sunlight intensity causes heating, it is harder to see.

Statistics for the suits:

* Critical to note, I was checking for time until waste tank filled up, hard to gauge the harm suit since it doesnt fill up the waste tank with oxygen for cooling.

Method:

Fairly straightforward, This was on Venus in a small 3x3 room that I could vacuum out or open the ceiling to allow sunlight in. Venus solar Irradiance was 2644 W and I used Orbit Timescale 0 to force the sun to stay still for tests that required solar irradiance heating. I tested the EVA suit, Hardsuit, and Harm suit. Conditions were:

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For the hardsuit and harm suit, I could read logic to find out the rate for how fast the waste tank was filling, temperature, pressure, etc. for the different suit stats. To get a rough timing, I had a music kit timer that I clicked on and pressed F to swap my waste tank with a completly empty one. When I got the warning for the waste canister at 100%, I stopped the timer. I did 4 test conditions for each suit. I did the suit pressure tests at 101 kpa and 50kpa as well as exposed to Venusian atmosphere in shade and direct 14sunlight.

When I got to the harm suit, I realized that the above method to check the time would not work. When I attempted this test for the HARM suit, I found out 2 things. The harm suit does not push any excess air pressure into the waste tank so the waste tank was 0 in creative and pure CO2 on any other difficulty. The second thing is the waste tank temperature matched the suit’s temperature when the AC was running. Instead I wanted to see how much the temperature of the coolant tank changed after being exposed to Venusian conditions for 600s. Unfortunately I may have some errors here since I needed to wait until my airlock cycled out so the numbers may vary depending on how fast or slow I was to start the timer from the airlock or how long it took for the airlock to cycle out. I was concerned with the temperature change in the coolant tank so I had to note the before and after for all test conditions.

Data:

Timing Result Data for the Suits under each test condition. I quickly found out that I need a separate test for the Harm suit though to see if I could glean any type of conclusions for it. First Number is creative mode, second number is in Normal difficulty.

For the HARM suit test… I had to note what temperature my coolant tank was before and after being exposed to the test conditions. I had to wait for my suit to stabilize then while in a vacuum I replugged the coolant canister to the coolant refill station to get the temperature back to hopefully the same conditions every time and the same amount of gas. In all cases the canister had exactly 260.873 total moles of pollutants

Interpretation:

Looking at EVA vs hardsuit, the factor between their thermal coefficients definitely play a role in determining how long it takes before the waste tank fills up. In those test cases you see that the Hardsuit waste tank takes approximately 3.3x as long to fill up compared to the eva under similar shaded conditions. The sun definitely has an effect, but it is quite difficult to quantify its effects and I’m not sure just how much it affects. Small tests seem to suggest it adds about 4J of energy under the Venusian sun. While that doesnt sound like much I want to point out that the suits have a 13L capacity so they have about .5 mol total in the suit to be exposed to the 4J of energy (Which I presume gets modified by the solar heating coefficient) which can equate to some temperature change. In their cases, I saw some consistency such as the EVA suit time dropped about 8% with solar heating and the hardsuit dropped about 20% with the heating. My explanation for this is since the hardsuit is much more insulated against convection, the solar heating then plays a bigger role in how fast the waste tank fills up.

As far as the pressure settings, this continues to confirm that a lower suit pressure means that less energy transfers to the suit or it could be that the time doubled because only half the air gets heated and vented to waste at a time. You can see that the waste tank is filled with slight less concentration of Oxygen and lower temperature with reducing the suit settings.

Looking at the Harm suit, I had to derive a separate test since it functioned differently. Because there was no logic for the coolant canister, I couldnt grab exact changes of temperature and conditions of the canister so I had to approximate and deal with depressurization and walking time along with human error. Taking the possibility of human error to account, I was not expecting those results to be extremely similar as far as energy that was moved into the cooling canister. The approximate energy moved to the coolant canister was roughly the same in all cases… some of the error could be attributed that in some cases I was a bit slower to start/stop the timer or get in the airlock in the same time to depressurize the atmosphere. I dont understand how breathing could possibly affect the energy being moved, but also I was surprised that varying the pressure setting of the suit didnt affect how much energy was being transferred to the coolant tank for cooling. The Harm suit either has a different formula for thermal transfer or I need to attempt to repeat the test on the hardsuit to see if a similar amount of energy is dispelled in all cases.

Conclusions:

From these tests, until disproven, I can at least say the following.

• Lowering the pressure in the EVA, Hardsuit, and possibly the Icarus suit does seem to proportionally increase the time it takes for the waste tank to fill due to heating.

Harm suit Specific traits I learned:

1. The cooling for the Harm suit is done completely by the coolant tank. You will roast if you remove the Coolant canister if you need to cool down.

2. The heating is done by the battery like the other suits.

3. No air is pushed to the waste canister except by the filters.

4. The harm suit has a 400L total capacity for air, this means your suit has a lot of air inside it. A suit breach is very destructive to you.

5. The harm suit doesnt seem to be insulated in your backpack, it will heat up. This means you cant hotswap between suits safely in a hostile condition since it will need to cool its internal tank back down after you put the suit on.

6. The Cooling seems to …

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