Either be active in management or hire a reputable PM who can satisfy this role.

Either an in house maintenance person with HVAC certification or you have to hire out subs for the various jobs.You can always contact PM companies and ask them what they budget per unit for maintenanceGino

Once you've scaled to 40-50+ units, then you could hire an in house PM and that could cut the costs. 

Definitely hire one for a property damage claim, auto claims its not necessary.

Otherwise, as @Nathan Gesner points out, it can be MORE expensive than hiring the right professional.ALSO:Recommend you first figure out the property Class you want to invest in, THEN figure out the corresponding location to invest in.If you apply Class A assumptions to a Class B or C purchase, your expectations won’t be met and it may be a financial disaster.If you buy/renovate a Class A property in Class D area, what quality of tenant will you get?

Hire a property manager.

See if F-Street/The Hard Money Company is hiring. 

@John Arena you may want to review your property management contract in detail to understand what services you hire them to perform.We find that many STR PMCs are NOT really PMCs, but are Guest service companies. 

I am not a plumber, but I have had my fair share of this, and most of the time, you can hire a plumber to snake & jet the line.

You can also hire a Registered Agent in your state to do it all for less than an attorney would cost.