A new high-efficiency furnace has been installed, and the furnace seems to come on too often. What is the MOST LIKELY cause?

Choosing an improperly adjusted heat anticipator as the most likely cause for a new high-efficiency furnace turning on too often is a sound conclusion. The heat anticipator is a component within the thermostat that helps regulate temperature by adjusting how long the furnace will run before turning off. If the heat anticipator is not set correctly, it can lead to the furnace cycling on and off more frequently than necessary, creating a situation where the furnace appears to be running excessively.

This is particularly relevant in a high-efficiency furnace, which is designed to prolong cycles for maximum efficiency. An incorrect adjustment means the anticipator may not account properly for the actual heat loss in the space, leading to more frequent activations of the heating cycle.

Other options, while they could contribute to problems in furnace operation, are less likely to be the primary reason for the excessive cycling. For example, excessive airflow can cause a furnace to cool off too quickly, leading to frequent cycling, but it usually results from setup or installation issues rather than an adjustment related to the thermostat itself. Similarly, a malfunctioning thermostat could cause heating issues, but it would more likely lead to irregular or inconsistent operation rather than repeated cycling. A blocked flue is a serious problem that typically would prevent the furnace from