Frozen faucets

[Inderpal Chadha]

This is not Alaska but a frozen faucet in Maple Valley, Wa. All the faucets are frozen, the heat is off as of now ( no one lives at the property). The heat will be hopefully up in a day. The temperatures were in the teens but will start rising above 34 in a day. I have turned off the mains. The question I have is, what is the process I need to follow to thaw the pipes once the heat is on, or will they just thaw naturally. What precautions I need to take or do I need to call in a plumber to detect any leaks. Yes, it was quite stupid of me to not have the heat fixed in time. Look forward to money saving recommendations.

Thanks

Inder