. Oversized air conditioners (and heat pumps) do not run long enough to dehumidify the air, which results in the "clammy" feeling and unhealthy mold growth in many air-conditioned houses... improvements such as these to reduce heat loss in the winter and heat gain in the summer should allow you to install a smaller systems while still being comfortable, as well... number and ages of occupants Occupant comfort preferences The types and efficiencies of lights and major home appliances (which give off heat). Correctly Sizing Heating and Air...