What legal rights do I have as the owner of the house? Note: he does have all his mail sent here to this address. And he does pay for food only.
You'll have to take this deadbeat through the eviction process.
Here is all the information you need to file an eviction in your location:
Civil Process Information | Chester County, PA - Official Website
Chester County, PA - Official Website
These websites will explain step by step.
You MUST do exactly as described, or you'll be forced to start all over.
So, make sure you read everything before doing anything, and obey each step religiously.
This website discusses evictions GENERALLY in PA:
How Evictions Work in Pennsylvania
You can sometimes offer a deadbeat $100, $200, or $30, or some amount to leave immediately and take all of his/her junk.
You can find agreements online, or make one up, simply saying Deadbeat Donemewrong VOLUNTARILY agrees to leave on Some Date for which Wronged Lover will pay Deadbeat Donemewrong the sum of $somemoney after HE has vacated my premises and is safely on the public parking lot at Walmart on Something Gone Wrong Street in Lost Lover, PA.
Good luck, and never allow anyone to live in your home.
In fact, be smart and don't invite scammers, freaks, ne'er do wells inside your home.
Your home is NOT a flophouse for losers.