Many homeowners, especially those facing chilly weather, often confuse auxiliary heat and emergency heat. While both systems kick in when your primary heating source struggles, they are distinct and serve different purposes. This article clarifies the differences and helps you understand how each system works within your HVAC setup.
What is Auxiliary Heat?
Auxiliary heat is a supplemental heating system that works in conjunction with your primary heating source, usually a heat pump. Heat pumps are highly efficient in milder temperatures but can struggle to provide sufficient heat during extremely cold conditions. That's where auxiliary heat comes in. It's typically electric resistance heating elements located within the air handler. When the heat pump's efficiency drops below a certain threshold (usually defined by outdoor temperature), the system automatically engages the auxiliary heat to supplement the heat pump's output, ensuring your home stays comfortably warm. Think of it as a helping hand, providing extra warmth when needed to maintain your desired temperature.
How does auxiliary heat work?
The system monitors the outdoor temperature and the heat pump's performance. If the heat pump isn't producing enough heat to meet the thermostat's setting, the auxiliary heat activates. This is a gradual process, often seamlessly blending the heat pump's output with the electric resistance heating. This helps maintain comfortable temperatures while minimizing the use of the less efficient electric resistance heating.
What is Emergency Heat?
Emergency heat is a different beast entirely. It's a purely electric resistance heating system that acts as a backup when your primary heating source, again often a heat pump, malfunctions or is unable to operate. This system is significantly less efficient than a heat pump and, as a result, will be far more expensive to operate. It's designed to provide emergency warmth, not long-term heating.
How does emergency heat work?
When your heat pump completely fails or encounters a critical issue preventing it from producing heat, the emergency heat kicks in to provide a minimum level of warmth. This typically involves simply turning on the electric resistance heating elements at full power, regardless of the outdoor temperature or heat pump status. This "all-or-nothing" approach is far less efficient and significantly increases your energy bill.
What is the difference between auxiliary and emergency heat?
The key difference lies in their purpose and how they integrate with your primary heating system:
- Auxiliary heat is a supplemental system that works with your primary heating source (usually a heat pump) to improve efficiency during cold weather. It's a gradual and relatively efficient boost.
- Emergency heat is a backup system that kicks in when your primary heating system fails. It provides minimal warmth but is highly inefficient and costly to use for extended periods.
Is it expensive to run auxiliary heat?
Auxiliary heat is more expensive than using a heat pump alone because it uses electricity directly to produce heat. However, it's significantly more efficient than running emergency heat and typically only operates for short periods, so the added cost is usually manageable.
Is it expensive to run emergency heat?
Running emergency heat is very expensive. It's purely electric resistance heating and uses a large amount of electricity, resulting in significantly higher energy bills. Use emergency heat only when absolutely necessary and for the shortest possible duration.
How can I reduce the use of auxiliary or emergency heat?
Minimizing the reliance on auxiliary and, especially, emergency heat can save you money and energy. Some strategies include:
- Regular HVAC maintenance: Preventative maintenance ensures your heat pump operates at peak efficiency, reducing the need for auxiliary heat.
- Proper insulation: Well-insulated homes require less heat, reducing the burden on your heating system.
- Sealing air leaks: Prevent drafts and cold air infiltration, improving the efficiency of your heating system.
By understanding the differences between auxiliary and emergency heat and taking proactive steps to maintain your HVAC system, you can ensure a warm and comfortable home while minimizing energy costs. Remember, contacting a qualified HVAC technician is crucial if you experience consistent issues with your heating system.
