I would suggest getting something from your insurance company in writing. Also it would be smart to check with the Massachusetts Registry of Motor Vehicles (RMV) since each state has its own laws about the length of time you can reside in their state before needing to register and license yourself and your vehicle with them.

Some state laws and insurance guidelines say that you must insure your car in the state that you reside in the most months out of the year. If this is Massachusetts and not Pennsylvania then you might need to change your insurance to MA from PA. Check with both your insurance company and RMV to get concrete answers.

If you are in need of MA auto insurance you can get a quick quote here.