I should have made my self more clear.. I run the heater on high in the day time.. and usually stays about 88-89... at night i turn it down.. and it drops to about 82. Also, there are cooler and hotter spots in the tubs.. The area at the back of the rack with less airflow and the water stays a bit cooler... but the area facing outwards towards the heat stay abit warmer.. not much.. like 3-5 F warmer/cooler