temp. vs cubic feet

Hypothetical Question:

If all conditions where exactly the same (intake constant temp, humidity, etc.) ..............exactly the same except room size.

What would produce more heat?

Example:
2 spaces .....both have 600watts of light and 125cfm ventilation exhaust.
1 is 100 cubic foot space.
1 is 150 cubic foot space.

anybody know an answer?

If the outside-the-box temperature is lower, my guess would be the larger box would get hotter since the smaller would be exhausted more often and be taking in more cool air.

The reverse would be true if the outside-the-box temperature were warmer than the in-the-box temperature.