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I'm using a 100,000 btu heater

The only co2 I'm using is the heater too keep it warm

So don't worry that it gets to 4000 at night

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?