What is the Difference Between Auxiliary Heat and Emergency Heat?

Introduction

When it comes to heating systems, there are various terms that can be confusing for homeowners. Two commonly misunderstood terms are auxiliary heat and emergency heat. While both of these terms refer to backup heating methods, there are significant differences between the two. In this article, we will explore auxiliary heat and emergency heat, their functions, and when they are typically used.

Auxiliary Heat

Auxiliary heat, sometimes referred to as secondary heat, is an additional heat source that is used when the primary heating system is unable to meet the desired temperature set by the thermostat. Most commonly, auxiliary heat is found in heat pump systems.

Heat pumps work by transferring heat from the outside air to the inside of a home. However, in extremely cold weather conditions, the heat pump may struggle to extract enough heat from the outside air. This is where auxiliary heat comes into play.

When the heat pump alone cannot provide sufficient warmth, the auxiliary heat kicks in to provide additional heat. Auxiliary heat is usually generated by electric resistance heating elements, which are less efficient but can produce more heat quickly.

It’s important to note that auxiliary heat is automatically activated by the thermostat when it detects that the heat pump alone cannot meet the desired temperature. Homeowners typically don’t need to manually switch to auxiliary heat mode.

Emergency Heat

Emergency heat, also known as backup heat, is a heating system that is meant to be used in extreme circumstances when the primary heating system fails or is unable to function properly. This type of heat is commonly found in systems that use a furnace or boiler as the primary heat source.

In the event of a malfunction or complete breakdown of the primary heating system, the emergency heat can be manually activated by the homeowner. This usually involves turning off the main heating system and switching to emergency heat mode, which activates a secondary heat source.

The secondary heat source in emergency heat systems can vary. It may be electric resistance coils, gas burners, or even a wood-burning stove. The purpose of emergency heat is to provide a temporary solution until the primary heating system can be repaired or replaced.

When to Use Auxiliary Heat

Auxiliary heat is typically used in situations where the heat pump alone cannot provide enough warmth. This often occurs during extremely cold weather conditions or when the heat pump is experiencing issues such as a refrigerant leak or a faulty compressor.

When the heat pump is unable to extract enough heat from the outside air, the thermostat automatically activates the auxiliary heat to supplement the heat pump’s efforts. This ensures that the desired temperature set by the homeowner is maintained, albeit with less efficiency.

When to Use Emergency Heat

Emergency heat should only be used in emergency situations, as the name suggests. It is meant to be a backup option when the primary heating system fails completely or cannot function properly.

Examples of situations where emergency heat might be needed include a furnace breakdown, boiler malfunction, or an extended power outage. In such cases, homeowners can manually switch to emergency heat to keep their homes warm until the primary heating system is repaired or power is restored.

Emergency Heat vs. Auxiliary Heat: Key Differences

Now that we understand the basic definitions of auxiliary heat and emergency heat, let’s summarize the key differences between the two:

1. Activation: Auxiliary heat is automatically activated by the thermostat when the primary heating system is unable to meet the desired temperature. Emergency heat, on the other hand, needs to be manually activated by the homeowner in emergency situations.

2. Purpose: Auxiliary heat supplements the heat pump’s efforts to provide additional warmth when necessary. Emergency heat, on the other hand, serves as a backup heat source when the primary heating system fails or cannot function properly.

3. System Type: Auxiliary heat is commonly found in heat pump systems, while emergency heat is typically used in systems that rely on a furnace or boiler as the primary heat source.

4. Activation Method: Auxiliary heat is activated automatically by the thermostat, whereas emergency heat requires manual activation by the homeowner.

Conclusion

In summary, auxiliary heat and emergency heat are both backup heating methods used in different scenarios. Auxiliary heat is automatically activated by the thermostat when the primary heating system is unable to meet the desired temperature, typically found in heat pump systems. Emergency heat, on the other hand, is manually activated by the homeowner in emergency situations when the primary heating system fails. Understanding the differences between these two terms can help homeowners effectively use their heating systems and ensure comfort in their homes.

Frequently Asked Questions (FAQs)

1. Can I switch to emergency heat mode during mild weather conditions?

It’s not recommended to switch to emergency heat mode during mild weather conditions as it can be less energy-efficient and more expensive to operate compared to the primary heating system.

2. How can I tell if my heat pump is using auxiliary heat?

If you notice that your heating system is blowing warm air, even when the outdoor temperature is above freezing, it is likely that your heat pump is using auxiliary heat.

3. Will emergency heat mode automatically switch off once my primary heating system is repaired?

No, emergency heat mode will not automatically switch off once your primary heating system is repaired. You will need to manually switch back to the normal heating mode.

4. Can I use emergency heat mode as a regular heating option?

No, emergency heat mode is not meant to be used as a regular heating option. It should only be used in emergency situations when the primary heating system fails or cannot function properly.

5. Is emergency heat more expensive to use compared to the primary heating system?

Yes, emergency heat is generally more expensive to use compared to the primary heating system. It is designed as a backup option and is often less energy-efficient, resulting in higher energy bills. It’s best to use emergency heat sparingly and only when necessary.