Not sure how long an eviction takes in Florida, but it seems a little premature to have already posted his unit for rent.Do you have any idea how long your tenant is expect to be locked up? 

I can't afford to have tenants move out because the heat is weak when it's 20 degrees out.The big problem was that the exchange coils inside the air handler were completely gummed up.

I would rather have a property in good condition and finance the amount I spent in the price than try to push chewing gum in the whole on a roof and have damage to the property if it failed or to my reputation if it worked.

May be premature, but I like to have my ducks in a row.

However I would really think out what the cost of a premature drawl vs saving up additional funds for down payment if you can't tap into the equity of what you already have. 

The calcium buildup will prematurely wear out the heater(not in your case, ancient heater that runs forever) and allows bacteria growth as well as decreased thermal capacity.

on a side note, the hazard is a window that he and his family broke which is on order from the window company and hasn't come in yet, all unsafe glass has been removed and it has been such a wet season that often we can't mow because it gums uo the mower aside from the fact that every time we go to mow we spend 20-30 minutes picking up his garbage and toys from the yard just to mow.Some guidance would be greatly appreciated for this newbie.

Your lease and your actions must be as if the lease went full term and the move-out is per the move-out inspection and no punitive action for premature termination - - aka, they are due FULL REFUND.

I breezed through my exam in 45 minutes and passed the first time, so I'm pretty sure I kicked butt, but that's not even going to buy me a piece of gum.

I have no expectation of getting a dime out of someone who moves out prematurely, but I also don't want to give them a penny of their deposit if they bug out and leave me with an unexpected vacancy.