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I completely agree - do not touch the dial once you have the temperatures steady. The room temperatures should stay steady too - and no hot or cold drafts. I can't use a Styrofoam incubator in my house.. see my signature line. I used to use them but I can't here.
Use warm water, and let the incubator return to the proper temperature over time. Since you don't say you have a fan it will take longer - but if you change the temperatures you will get spikes that can kill the growing embryos, or cause defects that will kill them at hatch.
If you can - put rocks under the grate, or bottles of water or something to use as a heat sinc. Those will radiate the heat back into the incubator after you open it and bring the temperature back steady more quickly. The temperatures will also drop when you first put the eggs in - do not change the temp dial then either.