Sorry guys, typo there. I can just picture the bulging eyes. I really meant -15!! Between -10 to -15 is how I REALLY like it. But most of the time I have it between -18 to -25 in my 15 x 12 bedroom. Is THAT unusual? Does wire gauge affect anything? Right now I have connected through 16ga bare ends. Haven't had time to run to get banana plugs.