Yeah, that latent heat of vaporization can play hell in cooler temps. Sure can help when there's heat in your tent though!!! It also helps when you're running methanol in a turbo drag car too! No intercooler needed!!
Yeah, that cooler temps was my problem for a few days when the lung room went from being cooled with the package a/c to using the heat of the lighting. My particular issue was because the air in the lung room was becoming stratified and I couldn't get a stable tent temp or humidity. Simple fix! I turned on the ceiling fan!
I also directed one of my clip on fan to hit the light and keep the tent from being stratified also and to better distribute the heat inside the tent.
The tent is now pretty stable and the girls show it. An interesting thing I notice now, is that the lung room runs pretty much the same temp as it was when I was cooling the lung room. The temps and humidity were rock stable then too.
It may get back to a cooling need later this week for a couple of days. Since I think I have this particular set up figured out, I don'y think it will be too difficult to transition for a few days and then back to what I'm doing now