I live in the condo unit directly above the Reznor garage heater. We are supplied by city gas. Yesterday when the heater kicked on my condo was filled with a hideous odor particular in the area directly above the heater. What could be the cause and what should I do about this? My CO detector did not activate. I am noticing a bit of dizziness. Also, related or not, my humidity level is quite low (a bit under 25) even with a humidifer running. Any thoughts or suggestions would be greatly appreciated.