Sure..until it doesn't. Nobody can answer that.If I pressurize it to 100psi with air and find no leaks will the rest hold?
The word miracle comes to mind.What are the odds the sink and shower valves survived?
You are in minnesota...don't you people drain your houses when they are vacant? It takes a long time for a house to freeze. Why would you leave the system charged when nobody is there? That's crazy. A temperature monitor is 200 bucks. It calls you if you have a power failure or a temperature alarm. You can even set one up with a cellular module. :no: