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Bigbud123
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I grow in cold climate and need to run a large l.p. heater for most of the night and my co2 levels reach 4000 during the nighttime ,and 1500 during the daytime , is this too high at night for flower?
So don't worry that it gets to 4000 at nightPlants dont use co2 at lights out
Only during lights on is co2 effective.
The only co2 I'm using is the heater too keep it warm4000 is to much at night anything over 2000 ppm imo. Make sure you aren't using co2 at night, plants only use when lights are on.
I'm using a 100,000 btu heaterSounds like your using a burner for heat and co2. You may need to use a heater at night vs the burner to keep temps up and in check.
Have you ever looked into ethylene buildup?So don't worry that it gets to 4000 at night