Any tips on unthawing pipes? We spent last darkness out at a hotel, when we got home...

We spent last darkness out at a hotel, when we got home today we own no water. We have forgotten to plug in the bake tape, stupid mistake. We plugged it within as soon as we got home, it's be on about 8 hrs presently. My husband was below the house with the blow dryer for almost an hour but still no water.

Thurs it's supposed to melt up to 40 day and low 30s at hours of darkness. Do you think that the greater temps combined with the boil tape will soften the pipes? We've turned on the kitchen and bathroom faucets to allow the pipes to release pressure. Are the pipes most likely going to split?
Does running an extension cord to an airconditioning...
Answers:    Do not use a blow torch as I run on heaps fires after this is done. Assume the pipes are copper so will not split. if plastic they might. Insulate them after they thaw near your already boughten heat cassette touching the pipe and use a very full-size insulation to cover the pipe. like 3 to 5 inch gooey all around. Foam against pipe and fiberglass wrap over that. Keep it fluffy and protect against crisscross with dissertation or plastic cover over all insulation. No pipe surrounded by North America should be uninsulated and rely on heat cassette, you are just asking for trouble. Insulation is cheep and hotels (after you run out of hose down to put out a fire...) are expensive, congratulations on the knowledge you hold gained by making this adjectives mistake, don't repeat it. An ounce of prevention is worth a pound of cure...
Help! Puppy chewed the cord.?
Maybe the pipes busted somewhere and you don't know it? As long as the heat cartridge is plugged in they should not split, and next to lows only surrounded by the thirtys, they should not split anyway.