My furnace never reaches the target temperature on the thermostat. Even if I increase the temp on the thermostat, the temperature is never met. The current temp is set for 74 degrees, it was 62 this morning? The furnace is a Goodman, the thermostat is digital. I just replaced the thermostat because I thought the old one didn't work. Nothing changed. When I connected the new thermostat, there were several colored wires. I connected all wires, including a red wire into the Rh slot. The Rh/Rc slot had a jumper. Should I have removed the jumper?