If you increase the temperture to 80 F you also increase the number of days to flower. The rate of photosynthesis is controlled primarily by light and carbon dioxide, but temperature has an effect. In general over a specific range as temperature increases the rate of photosynthesis increases IF other factors are not limiting. The increase is linear at lower temperatures but the rate starts to drop off at higher tempertures. The effect of temperature is roughly equivalent to the effect of temperature on enzyme reactions.
All life needs a source of energy and respiration provides that source of energy.
One of the primary factors that controls respiration is temperature. As the temperature increases the rate of respiration also increases. Apparent photosynthesis is important because the plant grows by using the products of apparent photosynthesis as substrate. Our job as growers is to maximize the amount of apparent photosynthesis. There is a net loss of stored carbohydrates when the plant is below the compensation point because more is being respired than is being produced by photosynthesis.