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A partially clogged capillary tube in an HVAC system can restrict the flow of refrigerant. This restriction means that not enough refrigerant is reaching the evaporator, leading to what is known as a starved evaporator. The evaporator’s primary function is to absorb heat from the indoor air and cool the space. When it is starved, it cannot efficiently absorb heat, which can cause a range of issues, including inefficient cooling or possible ice formation on the evaporator coils due to low refrigerant flow.

The other options relate to different issues within the HVAC system. A frozen compressor can be a consequence but is not a direct result of just a partially clogged capillary tube. Low refrigerant levels typically indicate a leak in the system rather than blockage in the capillary tube. Increased indoor humidity could arise from various conditions, including inadequate cooling, but again, it is not a direct result of a clog in the capillary tube specifically. The main and most direct result of this scenario is the starving of the evaporator due to reduced refrigerant flow.