They are also simpler over the life of the unit to maintain because there are just three main components instead of four(+) with HVAC.  

Real estate can be lucrative, but it's also important to be prepared for unexpected expenses and market fluctuations.Remember, patience and perseverance are key.

And finding what components in what condition = what $ and time in sold. 

So from my experience here is what you can consider: Having a reliable technician or two on standby for unexpected issues. 

Once it is determined there are zero lead-paint components within said unit, then they may receive a lead free certificate.

As others have said, there’s plenty of way to make up this marginal cost that saves your guests the embarrassment of asking upstairs to toss down a half used roll or make an unexpected run the gas station with a dirty bum

You can take out what's left, but I suggest keeping a reserve for unexpected expenses or vacancies.Hope this helps!

As you may know, a good portion of your monthly rent will not go in your pocket, it will go to the constant maintenance, upkeep, repairs, taxes and the like.Fourth, ask yourself... if you have a vacancy, the economy goes in the tank, you have huge unexpected repairs, etc....will your tenants chip in to help you out?

Ensure you have enough reserves for unexpected expenses, and understand the property's projected cash flow to avoid overleveraging. 

This can go towards covering unexpected maintenance costs or damage to the property.