My winter shaded hives suffered from Nosema.
My summer shaded hives produced less honey (by several supers worth). Evaporating nectar to finished honey requires a lot of energy, the heat of the sun helps, otherwise, the bees have to contribute that energy themselves-- no free lunch.
Remember, the huge "latent heat of vaporization" is the principle by which swamp coolers keep homes cool. Latent heat (or Enthalpy) is higher in sugar solutions than in plain water, it really does take some effort to get the vapor out.
(Your experience may vary, my coastal, often foggy location is more humid and cooler than most areas). Experiment and critically assess your results.