furnance problems. My furnance starts cuts off then starts.You can here it click trying to start it will finanley start,but it puts out cold air to long. I have had 4 different people look but no one has fixed it. tired of paying 80.00 dl. gas valve limit switch, pressure switch have been replaced, anyone with suggestion . The post i did on the dewalt power shop from my father law it says use an in line 30 fuse and wire no smaller than a 12.It is on a 15 breaker in the shop. should i put it on a 20 by itsself. thanks