Harvey Schneider
Minister of Fire
If your construction is recent, the high hats are probably air tight. Look for the letters "AT" on the label inside. They may still need to be caulked around the edge of the can, but the can on these is sealed. Replacing old ones may be a lot of work, but the newer air tight / insulation contact (ATIC) cans are about $10 each.I have a fan blowng the hot air out of the room but the room also has 8 hi hats. Maybe losing energy there as well. Ill try moving the sensor.