Received a Myrmecocystus Mexicanus and Navajo Queen in founding stage with just eggs both in test tube. My house temperature range from 70 to 80 F and it will drop down to 65 during winter. I know they don't need to diapause so I don't plan to hibernate them. Purchased Zoo Med heating cable and digital thermostat. What is the lowest temperature should I set for founding and later for colony? Mexicanus is from Mexico with cooler climate whereas Navajo may require higher temperature? I am also trying to save on electricity so can I just maintain 78F or 82F?