Does a two-stage thermostat differentiate heat pumps from central air-conditioning systems?

A two-stage thermostat can indeed differentiate between heat pumps and central air-conditioning systems. The primary function of a two-stage thermostat is to manage the heating and cooling in a more efficient way by offering two levels of operation—typically a low (or first) stage and a high (or second) stage.

In the context of a heat pump, the two-stage thermostat can optimize the system's performance by allowing it to operate in a more energy-efficient mode during milder conditions, engaging the second stage when more heating or cooling capacity is required. This is particularly beneficial for heat pumps, which can provide both heating and cooling, allowing the thermostat to switch between modes based on the current demand.

On the other hand, a typical central air conditioning system generally operates in a single stage for cooling. If it requires additional cooling beyond its first stage capacity, it would need to operate continuously at its maximum output, rather than engaging a second staged operation that adjusts based on the demand.

Therefore, the capability of a two-stage thermostat to handle different operational modes effectively makes it distinguishable for heat pumps as opposed to central air conditioning systems. This makes the statement true.