This is about exactly where I'm at with the HPS/LED debate. It boils down to how you use each one to benefit your situation.
For me to grow in the warmer summer months, I have to use an A/C unit -no matter what light source I use. To use my 8 cob led light during those months is an absolute no brainer. Less electricity from the light itself from the wall, less heat expelled which in turn requires less A/C. The whole snowball effect of running cob led's makes total sense. As for the loss of heat being expelled from led's, this now effects my winter time grows because like
@bravedave I too rely on the heat from the lights to keep the room warm. Without the heat from the light, I am forced to run a 1500W space heater throughout the entire day to maintain a good temp and that is completely counter productive on efficiency. My room is fully insulated from top to bottom so my loss is minimal. With my HPS the only time I need to use the heater is during the 12 hrs the light is off during flower. Im using my led's for their first run right now and so far the plants are loving life. As of now both HID and LED hold a solid place in my grow room and both aid in reducing my electronic footprint in my grow room.