i run two 250s for 6 hrs and 4 t5s over my 150. tank is in my living room with central air at 76 deg.
tank is about 81-82 deg in summer and the living room is hot. considering led even though i get good growth, the heat is a struggle. either led or a chiller outside.
No, never needed a chiller before. My last 120 had 2x400 and I didn't need a chiller on that one either. I keep the room 70-72 degrees and use a fan blowing across the water surface on a controller.