How do I extend my kegerator beer line run properly?

I have a built in kegerator in my kitchen, under the counter style. It is connected to a three tap handle tower and the lines are about 3 feet long. The noise from the compressor/fan is louder than I would like, and I am considering moving the unit to my basement, which sits directly under the kitchen counter. This would increase the run of my beer lines to something closer to 15 feet. The lines would drop down about 3 feet, then make a 45 degree turn and travel another 8 feet, then make a 30 degree turn and drop another 3 feet. My concern is the temperature of the beer in the lines, and the pressure I would need to serve at. What is the best way to ensure this longer beer line run works properly (i.e. beer is kept cool, and dispenses properly)?