He is a month to month rental. I allowed him to put a portable ac unit in his room (which trips the breaker) and and a fan and he still wants to run the central ac where it is uncomfortably cold. He says he needs it because he is fat. Anyway, I told him I couldn't accomadate his needs and that he would be better off somewhere else. I even found places I thought would suit him. That is when all hell broke loose. Oh well.
Read this document to become very familiar with what you can or cannot do or expect as a landlord.
What they state is to put in writing rules that apply to all tenants equally and give to all tenants. One thing that you will have to distinguish is this: Is he breaking any clear rules that are in writing, or, is he just a very unpleasant person?
In Virginia, everything that is enforceable must be in writing-and he knows that. Write up a page of rules that you expect all tenants to abide by, have each sign it, with your signature, as well. If he refuses, this will make your case stronger.
One more point, if he was a successful attorney, why is he renting a room and not owning his own home?
I'm not a lawyer, so this isn't legal advice. For that, you need a lawyer.
For example, if he has a one-year lease that doesn't expire in April, then does "dominating the AC unit" constitute grounds for eviction? Maybe, but maybe not. (You'd probably have a difficult time justifying that.)
However, let's say either he's on a month-to-month arrangement, or that your lease does allow you to evict him for "dominating the AC." Then . . .
He's responsible for paying through the time he's there. If he paid you the March rent on February 28 (the date of payment really doesn't matter), he's paid through the end of March: March 31.
You issued the notice to him on March 16. That means he's to be out of there by April 16. If he complies, then he owes you payment for the first 16 days (slightly over half) of April.
You don't owe him any money because he paid you early. He could have paid for 3 months on January 1 and you wouldn't owe him any money. If you do owe him any money, it's for rent that he's pre-paid but that he won't be using. For example, if he paid the full month's rent on April 1 and--per your 30 day notice--will be moving out on April 16, then you would owe him the return of approximately half of April's rent.
He owes you for the time he's living in your property. You owe him for any rent that he's paid that covers time he's no longer living there.
Hope that helps.