This would include the water heater, central air conditioning system, heat pump system, built in applicanes, etc. 

The problem with passive dehumidifiers is that the humidity is coming in with the outside air.

also, I'm told after Tenants move out with Cats to do all the Remediation work, Remove all Carpets put down new flooring, repair and clean all surfaces including air ducts for heating and air. to call an Indoor Air quality inspector and get units certified as Allergen free.

., former employer 401k) to a solo 401k are not reported on Form 5498, but rather on Form 5500-EZ, but only if the air market value of the solo 401k exceeds $250K as of the end of the plan year (generally 12/31);When funds are rolled over or transferred from an IRA or 401k to a self-directed IRA, the amount deposited into the self-directed IRA is reported on Form 5498 by the receiving self-directed IRA custodian by May of the year following the rollover/transfer.Rollovers (provided the 60 day rollover window is satisfied) from an IRA to a Solo 401k or self-directed IRA are reported on lines 15a and 15b of Form 1040;Pre-tax IRA contributions on reported on line 32 of Form 1040;Pre-tax solo 401k contributions are reported on line 28 of Form 1040;Roth solo 401k funds are subject to RMDs;A Roth 401k may be transferred to a Roth IRA (Note that from a planning perspective, it may be advantageous to transfer Roth Solo 401k funds to a Roth IRA before turning age 70 ½ in order to escape the Roth RMD requirement applicable to Roth 401k contributions including Roth Solo 401k contributions and earnings.)

Keeping 6+ deals together at the same time is a lot of plates to keep in the air, and finding properties to buy (with so little inventory and so much competition) ends up being the most challenging part for many investors. 

We have a few furnaces to replace and AC's to install (possibly- see below).2) What does everyone estimate the value of central air to be in a upper-medium-end rental in Minneapolis?

An older building with poor insulation and a lot of air leaks will be challenging with a mini-split.

I'm sure these are low-income tenants who aren't suddenly going to be able to pull another $300/month out of thin air. 

I’m a U.S Air Force combat Vet and an investor and licensed Realtor here in DFW.

My father bought a 1964 Barracuda that we intended on restoring, but instead I had a S-10 that I put a bunch of money into (air ride, wheels, etc.)