So what happens if the outside unit freezes up, like a chunk of ice and doesn't defrost? I have a brand new (two weeks old) Goodman 2.5 ton heat pump split system and it got to 20 degrees the other night and the outside unit wouldn't defrost. I called service and they told me to use the emergency heat which turned off the outside unit. The next day the sun melted the ice and it started defrosting normally again. The service technician doesn't know what caused this. He said the freon level was correct and he had no idea what the problem was. If this happens again what to I do? Any ideas?