In my 90 gallon acrylic tank I didn't want to run a chiller. So I installed two 4" fans on the canopy and leave the lids off. My sump is 42" long x 16" wide x 18" tall and open as well. LED
lights under the canopy and three small pc
's on the sump. My house generally stays around 80 degrees all the time. My tank stays around 78 constantly. And now to the evaporation, probably 1.5 gallons a day, but it's worth it not to have run a chiller. So losing 3 quarts sounds very reasonable to me.