Whatever you decide, to MOD or not, I would suggest getting a split system heat pump installed in the machine room regardless. If you keep your old equipment and just get it serviced, this could help, and if you go full on MOD, you will ruin it without proper climate control. If you can't get a ductless split system into your room, at least throw a baseboard heater in there with some open air venting. Get two thermostats and just have them set up so they both do not operate, I.e cooling comes on at 75 degrees and heater turns on at 60 degrees...
