One that never fails me and works right away is the Precambrian Era audio on Dreamseeds. It subsidies like 10 mins after so you kinda have to have it on loop if you need to but it lowers the temperature way down. Or you can program a Servitor to gather 100/200 hours worth of energy from the ambience depattern it and repattern it with the energy of PE and then to keep infusing and egoring you and the area you are in with it. For this you have to play a couple of loops while “teaching it” what energy you want it to copy/repattern the energy with, and you can actually program it to do that every time you tell it something like “so and so ---- name of your servitor ---- please start the cooling effect task”
Dark Servitors are greaaaat for that too.
Apart from my love KQ which does the same but steadily increasing not as fast as the PE, i also recommend big time the Enviromental Transformer Servitor on Patreon.
Always always does it for me, i usually ask him to lower the temperature 2 or 3 degrees and it does it takes like 5 to 10 mins to really feel, you can then tell it please keep it at that for the rest of “my day” or until i tell you to stop.
I find that it does not work if you ask any of the servitors like “do it for a week, or every day or for this summer” even if you tell them “know that from now without me having to remind you” nah even Skull lol but thats ok, hours at a time they def can keep up.