With that said, here is an opinion: You cannot write off anything you use as a personal residence.

The solar system adds no value to my property for rental purposes, and I may even be ripping up the roof & replacing it in the new year.Beyond sending a nasty letter through my attorney via certified mail, demanding the company come pick up their equipment, am I required to take any further action or fulfill any obligations regarding these contracts?

How do I get her number off of these lists?

Property values continue to grow in value, and you can actually live off the rental income.I think it's best to hav all properties paid off by retirement age, since that's when you are going to rely on cash flow for your living expenses.

Since then I have located the area where they entered and sealed it off, however I'm having trouble killing the ones currently living in the attic.

Here’s why this market is so ripe:1️⃣ Mom-and-Pop Sell-Offs at Huge DiscountsA lot of these properties have been in the same family for decades, but now the kids aren’t interested in taking over the business or the real estate.

My first property was paid off making me only $1000/month profit.

To adapt, focus on refining your ARV and repair cost estimates, explore off-market deals, and consider creative financing strategies like seller financing or partnerships.

We mostly buy off market now but I remember that is actually how I started investing, by flipping foreclosures. 

Cold calling is a great idea to get started, but maybe try connecting with local real estate groups or online forums too—they can sometimes have off-market deals.