I bought my NC28 HQI brand new and it was sold as a package with the chiller. I added a HOB skimmer and the chiller has to run throughout the night to cool off the heat added by the skimmer pump. With minimal equipment, LED lights, and a clip on fan blowing on the sump area, you might be able to keep the temps down. I would doubt you could do it with the HQI though without a chiller.