The seasons changed absolutely fast this year. It went to 90 degree days to 40 degree nights over the course of 24 seconds. When I went to change our temperature control from A/C to heat, it did not change. The air-conditioner stayed on… Cold air continue to pour out of the vents plus I could hear the compressor kicking on just the same as I did before. Clearly, it was time to call out the professionals. I did not know who to call or where to start. I did not know if I should call the oil furnace or the A/C repairman. I looked it up, plus I discover that they are all 1 plus the same plus they go under the title Heating, Ventilation and A/C repair. An Heating, Ventilation and A/C repairman was able to come out the absolutely next day plus she explained the situation. It seems that there is an internal switch inside our heating plus A/C plan that tells the plan to turn on the heat or to turn on the A/C. It all depends on what I set the temperature control to. The problem is, that the switch was broken inside our system. This resulted in our plan being stuck with the A/C on, regardless of our temperature control settings, because our Heating, Ventilation and A/C plan is so old, the worker had to order the part. I guess I will have to make do with a space oil furnace for a few nights. I just hope it does not get really chilly before the switch arrives plus she is able to respectfully service our Heating, Ventilation and A/C unit.