Is it normal that the air handler blows cold air when the outside trane compressor is in the 'defrost cycle'? I looked out the window the other day when it was 28 degrees and the compressor was (I think, in the defrost cycle) since I saw steam coming from it with the fan NOT rotating. It gave a hiss and that was it. The thermostat upstairs was set at 70 deg. The air-handler was on a blowing COLD air. Is this normal? Also, when the temp on the thermostat dropped to 69 deg., the air compressor outside came on and all appear to be working properly once again since I could feel the air coming out of the ducts as being warmer than the ice cold air that was coming out before.