I just got a new HVAC unit installed and my thermostat is jumping up and down in temperature. So far it has been on for about 6 hrs turning off about three times and quickly turning back on. Is this normal for a new system, is the thermostat not functionin correctly, not enough refrigerant or a bad installation? Also, what is the difference between stage 1 and 2 on the air handler? One more thing, what percentage should the fan be in?