I often hear from growers that if a grow room becomes too small or too large climate control becomes less efficient. This is a separate issue from the potential cost of a pest or mold outbreak increases with room size. For instance, one grower told me that when the room gets relatively small (for them the cut off was around 1400 ft2) temperature and humidity variability starts to increase to unacceptable levels, and he blamed it on decreases in HVAC efficiency at that scale. At the same time, I recently spoke with an HVAC vender who told me that room size doesn't matter. What do you think? And if you think room size does matter, do you have an explanation why? Thank you.