It must get really humid in there

@kespeppercorn where the hell do you see 5? There is only 1 in the picture, marked with red circle

Smartie boy!

Very clever!

Wow you are luck y to have 5 geothermal ducts so close. I really liked using the redist Heat mod. The mod introducing pipes that could be added, similarly to power cables, that could feed the heat into airs more efficiently. It also introduced industrial heaters and coolers so, similarly to what you did here, you can creat heat when for the winter and cold air for those heat waves. I am hoping it makes it into the core game as it really helps.

Solar panels are in a room, with no roof.
1-2 panels were at 50% proficiency because of the angle of the sun.
I deleted them and now only use geothermal.

At the time I had 2 heaters, neither of them were ever on, because heat was pooling from the geothermal source, and piped along the inside of the walls. Like a heat duct.
But after reaching a certain size, the geothermal source wasn't enough to equal out the temp. differential when doors open, and close.

http://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=758153165
Yellow lines are existing air flow routes, red-thick line is what needs to be cleared away to extend the ducts so they connect.
Might not be the most efficient way to do it, but I have 5 geothermal sources very close to my base, so energy is expendable.

how are your heaters gonna work when they are throwing heat outside with the cooling into the base? Oh and why are your solar panels inside???

After a certain point it wasn't enough heat for the space my base slowly started to take up.
But did provide enough heat for the space shown.

In fact it's not really efficient, I think.

Recycles heat from the freezer, and the geothermal source. Enough heat to warm my base during the winter.