curious? many out there have experience with UNCURED rock?

i live in ny and we have had a few warm days, even with my heater all the way down the ambient temp in my house is warmer and my tank is like 80! ive opened up the glass halfway on top .......any advice on balancing the temp with warm/cooler days and ambient room temp?
In my case I found that I just had to remove the glass cover.
I had no choice and would have really preferred to have kept it. But my room temps are as low as I can tolerate (I garden outdoors in the heat most days), so the glass had to go- I have a small fan blowing across the surface of the water and the lighting elevated a bit. Truth be told I am coming to love the ready access to the surface of the water- both for practicle reasons as well as aesthetic ones.
The difference is remarkable- as is the topping off!
 
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