Currently there is only one thermostat at the lower unit so I can see them cranking up the heat and then the renter upstairs is roasting so they open all the windows (duplex is in Wisconsin, so cold winters)We looked into electronic dampers with a second thermostat upstairs, but still have concerns about how to best / fairly split the bill.

Does anyone have a copy of this (electronic or tangible) they'd be willing to sell me?

All are presently leased via an electronic "kiosk" style system, which also handled payment and leasing duties. 

I still allow mailed checks/money orders but all my tenants have switched to electronic payment within the last year or two. 

What electronic methods are people using nowadays?

In other words, electronic payment is king. 

Electronic payments thereafter.  

Rent is paid electronically. 

@Carl Fischer1099-MISC with Box 7 Nonemployee comp is due 1/31.All other 1099 fact patterns (including 1099-INT) are due 3/31 if filed electronically.  2/28 if paper filed.

With the efficiency of title companies in delivering secure electronic information, the location of your QI really isn't an issue.  1031 as federal statute is performed the same nationwide.