hey Brian its a 1 1/2 plumbing. I will gravity feed it. Bayou I use supplimental lighting all year but cut it back several hours durring the summer months. As for the ac .... In the past I would turn the ventilator fan off so the cold air stays in. That metod is"not the most cost effective" so... thats why the new chiller
. The old way works but it will be nice to have as backup to the new chiller