Went on an service call today for no A/C. When we got there we found that the last service tech had not hooked up A/C low voltage. (Please bare with me) what they have is a Lennox air handler for strictly a/c and a reznor heater ducted into the same system. What I have a problem with is the wiring. They are wanting to use the same t-stat for both heat and cool, but both systems have threir own transformer. I know in some instances when we have added a/c to a customers house that had boiler heat we used the same t-stat by simply removing the jumper from R-H and R-C and wired each unit independent. I dont know if I can do this with this system.