I am using only belly heating. It does not warm the air for sure, but for sure they have the temperature and warmth that they need. Last year my BCI did not stop eating in winter although i did not change anything in his husbandry. Now he is 21 months old and he has reached sexual maturity. By the way, he did not poop out the last meal that he ate on the 8th of December yet. My Dumeril,s boa is 16 months old now and he did not stop eating last year in winter. I,m pretty sure they will eat again in March or no later than April. The positive thing about it is that no one can accuse me of overfeeding my snakes anymore :-)