I am on my second hatch with my LG. I have the auto-turner, but not the fan. My first hatch was really bad: 3 out of 16. I had done tons of research, set the thing up way early, and got everything stable before setting the eggs. No matter what I did, I was still having small temp spikes, but I think that during the day they went up higher, but I cannot be sure.
This time around, the experience has been completely different. I have maybe made two temp adjustments to the LG, but it has been virtually rock solid. The difference? I had some babies in a brooder in the same room and wanted them to have some airflow. I left my AC vents open (where I had shut them for the previous hatch). I found that the temp in the room stayed much more consistent and that the incubator has been running much more efficiently and an average of two degrees cooler! Following the advice of a few on the boards, I was under the impression that leaving the vents open would create a draft and negatively impact the hatch. So far, it's looking like the opposite for me. I'll be candling for Day 10 tomorrow, so I'll check back in to let you know the results. This hatch just feels completely different...much less stressful. If this hatch goes well, then the LG was certainly not to blame...it was my own room conditions and lack of experience.
So far, I see no issue with the machine this go 'round!