if coolers stack multiplicatively they could be good if you reach over 400%, I know coolers were capped at 300% a while ago, no idea if that has changed or not but ill put it like this

if coolers stack additively they just straight up suck and get worse when you add more compared to radiators

if they stack multiplicatively well they could be good

a shiver at the moment reduces cooldown time by 130% while at stationary not to say it removes cooldown time, it is actually a bit more complicated then that

100% if your default cooldown time, for a given unit, lets say the cooldown length is 4 seconds, so 4 seconds is 100% their is also the 1 second delay you need to factor in, the reason this is important is because you cannot reduce this 1 second delay but when you need to cooldown multiple times to shoot as many bullets as a radiator this 1 second needs to be times by the number of times you need to cooldown along with of Corse, your overall cooldown time

anyway to figure out how fast your cooldown will be you need to add 100% + 130% = 230% if you then divide 4 / 230% (must be % not just 240) you get the answer of 1.739 lets just round up to 1.74 you then need to add on the extra second that you cannot reduce with coolers, which gives the overall cooldown time of 2.74 with a single shiver

the next question is, how do these stack? if the stack by doing the entire calculation at the same time for example

100% + 130% + 130% = 360% from what I have found is that coolers actually get worse when you stack them compared to radiators

for example

if by default it takes 4+1 second to reload and you can shoot 100 bullets

2 radiators gives you 300 bullets to shoot every 5 seconds (the RN seal reached 100% cooling at full speed)

2 coolers requires 3 reloads to accomplish the same thing starting at 4 seconds and then dividing by 360% we get 1.1 add the second from before and your new cooldown time is 2.1 times that by 3 since you require 3 reloads and you have 6.3 this is much worse then a radiators

however if coolers stack multiplicatively for the same scenario the way you add things together change

first you add up the cooling of the first cooler so, 100% 130% = 230% which gives a cooldown rate of 1.74

you then take 1.74 make that the new â€ś100%â€ť and start the process over again 1.74 / 230% is 0.756 add the 1 second and you get 1.76 roughly which is allot lower then 2.1 like we had before, so if coolers stack in a multiplicative fashion and if they have uncapped max cooling capacity, they could become better then radiators when you stack enough of them

1.76 x 3 = 5.28 which is much closer to the radiators 5 second cooldown per 300 bullets

if you continue on with this you will find that at about 3-4 coolers, coolers become better, but remember, this is only if they stack in a multiplicative way dividing your time in half and then in half again, as to if they do that or not, I honestly have no idea, I donâ€™t have 3-4 shivers in game to test cooler stacking