Absolutely. The ambient temperature directly impacts yeast activity, with hotter temperature producing more CO2 than cooler ones. Changes in temperature throughout the day are one of the biggest causes of inconsistent CO2 levels with DIY systems. In general, room temperature is fine, but consistent temperature is better. All things considered though, it's just another aspect of DIY CO2 that you cannot control well, and in all honesty, it's not something I would devote too much time or effort in to control.