Can the police come and get you in your house in Pennsylvania? The short answer is yes, but it depends. The fourth amendment of the United States Constitution prohibits unreasonable searches and seizures. In part, the expectation is that the police would need a lawful warrant to enter a person's house. That being said, there are certain exceptions. If for example, the person gives the police consent to enter the house, then of course the police would have the right to do so.
If there's exigent circumstances, for example, if the police are pursuing somebody who's committed a felony and he or she runs into his or her house, the police can follow that person to the house or if there's say some public safety issue where getting a warrant would be against public safety or where evidence could be destroyed, the police can enter a person's house. Then there's also the circumstances if something is in plain view. If the police say are otherwise lawfully on a person's property or on a person's property and they see something in the house in plain view, a warrant may not be required in such an instance.
There are certain limited exceptions. It is nuanced in terms of what would be lawful and what would not be. Having an experienced Pennsylvania criminal defense attorney, will help you best to understand your rights if the police are trying to enter your house or have done so, and they should be involved as early as possible in the process to help you best protect and defend yourself.