How does a two-stage compressor enhance HVAC efficiency?

A two-stage compressor enhances HVAC efficiency primarily because it runs at different capacities based on demand. This capability allows the system to adjust its output to match the cooling or heating needs of the space more closely.

When cooling demands are low, the compressor can operate at a lower capacity, consuming less energy while still maintaining comfort levels. This not only reduces energy consumption but also minimizes wear and tear on the compressor since it is not constantly running at full capacity. Conversely, when cooling demands increase, the two-stage compressor can ramp up to its higher capacity, providing the needed cooling efficiency.

This adaptability contributes to overall energy efficiency, lower utility bills, and better temperature control within the space, making it a preferred choice in variable demand situations typical in many HVAC applications.

The other options presented do not correctly represent the benefits associated with a two-stage compressor. Operating at a constant speed does not provide the flexibility and efficiency that a two-stage system offers, and limiting operation to heating mode or requiring more maintenance are not traits associated with the advantages of variable capacity operation.