I have a boiler but it is expensive to run what should I do?

[Bobby Eastman]

My wife and I bought a 4plex 1.5 years ago. After going through a year I have some concerns about my boiler. The boiler is less than 10 years old and operates pretty good. However the company that my PM uses charges around $1200 to set up and drain each year 2,400/year. On top of that my 4plex cannot be individually metered for gas so I end up paying for the gas which costs over $3,000 per year easy. All of these costs are on top of any problems with the boiler system. I am wondering if this is typical with a boiler? Should a boiler in good working order cost between 2,000-3,000 to set up and drain each year on top of any issues?
I am looking into alternatives for AC/Heat and am thinking about the LG 23,000 BTU 230/208V Window Air Conditioner Cools 1,400 Sq. Ft. with Heater, Wi-Fi Enabled and Dehumidifier. This runs for a little less than $800 which even with 4 would be less than I spent on gas and the boiler last year. The boiler is the only appliance that uses gas in my building. 
My wife and I have considered self managing but due to the distance (Dallas-St. Louis) I have been hesitant. Does anyone have any suggestion for window units that have worked for them or ways to operate a boiler cheaper? Does anyone have any suggestions for a PM located in St. Louis? I greatly appreciate the help.