I have just purchased a new home...new to me. Having some trouble with an area of the house blowing fuses. Currently have 20A fuses on circut and there are 4 heaters on that circut. 7ft, 4ft, 3ft, and a 2ft heaters. I have calculated 250W/ft and came up with 4000W which has the total load at about 17A. This means that the circut is at 85% of the load. I'm not sure what the problem is to why the fuse keeps blowing now. Thinking that one of the heaters are defective or there are simply too many heaters on that circut. Is it safe to go to a 25A fuse instead of the 20A? Any advice would be appreciated. Do I have the correct calculations?

I've got a 1984 York hp system in a house I bought 8/2005. It's 29 degrees out and I have switched it over to emg heat to use the electric strips. I can't tell that the condensing unit ever shuts off and goes to the elect strips. But it has not iced over yet either. In reading posts on this forum I see mentions of change over points of 35 and 40 degrees. In following the wiring diagram I know that that temp point and the command to change over comes from the condensing unit, but if it does switch to the electric strips on it's own, should the condensing unit fan not shut off? With the outside temp down this low we were only getting 73-74 degree air out of the registers. In the emg electric mode I am up to air as warm as 80 degrees. I'm in north Arkansas and even though we have had periods of cold weather, when I'm not here for several weeks, my recording thermometer has showed that the house never drops below 60 with the stat set about 62. Thanks