the earths tempuratures stay relatively stable all year round. the have now created advanced heating and cooling systems for homes that use little energy and obtain heat(in winter), and cool(in summer) from the ground through special coils. (google geothermal heating)i dont know why i didn't think of this before, but i would probably bury my acid before anything else if i had to store it... i think my fridge is way below the tempurature range you gave me of 5-8C (converted 41-46F). mines definitely closer to 0C (32F)