If a tenant in Michigan didn't shovel snow for the season and the oil company refused to deliver because the snow was 4 feet high, so they ran out and there is no heat, is that now the landlords fault?

Derek its not just the AC I am worried about its the ducts and the heating, I would be willing to pay for the service too

How much do I need to profit on top of mortgage and all bills to make it worthwhile.2.What do you require tenants to be responsible.I am in the northeast and its cold do you require them to pay for heat, hot water, electricity, water, sewer etc.

@Robert Kirkley  Commercial loan where they have the flexibility to lend on properties that need extensive rehab (no kitchens, heating system, etc). 

This can alert you to a heating or cooling systems failure.

With significant demographic shifts either anticipated or under way, new renter households are expected to increase by 13 million by 2030, according to the Urban Institute.Enjoying a passive income stream has never been more obvious than the increasing heating up housing rental market.

BUT, let me also say that my property is in the mountains and we don't even have AC there so my success and experience is from heating only

Consider this:"In homes without appropriate insulation and ventilation in the attic, heat migrates. ...

The clencher was the used condoms I found stuffed in the heating vents.

I do this because an issue like a blown heating unit, major roof leak or broken pipe can easily run you a few thousand in some cases.