AC experts recommend smaller, more efficient systems now, and they want the fan running all the time. They want the air "changed" more often. I don't like the white noise of the fan running all the time... but I guess I understand if you want X temperature then a system running more often is more likely to keep the temperature closer to the goal. The blown in fiberglass we had done was the best $700 I ever spent. When we have to do the roof I'll get a ridge vent too. Rules: Please play nicely with others. -List members page (text & pic links): http://www.myelcamino.net/eclist.htm -List members page (all pics): http://www.myelcamino.net/ec_list.htm