Never, never open your door to a contractor who randomly appears offering to fix some unseen problem. You would think it’s common sense, but a California senior ended up paying a shady contractor $20,000 to perform $300 worth of work, and it took a sting operation to stop a Long Island contractor who was going door-to-door offering to plug nonexistent carbon monoxide leaks. So how can you protect yourself? Here are a few warning signs to beware….
