What is Auxiliary Heat

What is Auxiliary Heat? A Thornton, CO Homeowner’s Guide 

 HVAC Thornton Pros | Call (720) 807-4379 for Expert Assistance

If you own a heat pump system, you may have heard the term auxiliary heat. Understanding what auxiliary heat is, how it works, and when it’s used can help Thornton homeowners maintain comfort during Colorado’s cold winters while saving energy.


Q&A: Understanding Auxiliary Heat                                                                                                                                     Q1: What is auxiliary heat?  A: Auxiliary heat (often called backup heat or emergency heat) is a secondary heating system built into heat pumps. It activates when your primary heat pump cannot efficiently heat your home—usually during very cold outdoor temperatures.

Q2: How does auxiliary heat work?  A: When your heat pump struggles in low temperatures, auxiliary heat sources—typically electric resistance heating elements or furnace burners—kick in to provide supplemental warmth. This ensures your home stays comfortable even in extreme cold.

Q3: Why do heat pumps need auxiliary heat in Thornton?  A: Colorado winters can drop below freezing. Heat pumps are most efficient above 40°F. Below this, they struggle to extract heat from outside air, triggering auxiliary heat to maintain indoor temperature.

4 Reasons How Auxiliary Heat is Used                                                                                                                                       1. During Extreme Cold

• When outside temperature drops below the heat pump’s effective range, auxiliary heat activates automatically.

2. When Rapid Heating is Needed

• Auxiliary heat can turn on if the thermostat requests a large temperature increase quickly, such as when returning home on a cold day.

3. Emergency Heat Mode

• Some heat pumps allow manual emergency heat operation, which relies entirely on the auxiliary heating source.

4. To Prevent Overworking the Heat Pump

• Engaging auxiliary heat reduces strain on the primary system during sustained cold weather.

Q&A: Energy and Cost Considerations about Auxillary Heat                                                                                                Q4: Does using auxiliary heat increase energy bills?  A: Yes. Auxiliary heat, especially electric resistance heat, is less efficient and more expensive than the primary heat pump. Proper thermostat use and avoiding unnecessary activation can minimize costs.
Q5: How can I minimize auxiliary heat usage?

1. Install a programmable thermostat
2. Avoid setting very high temperature jumps suddenly
3. Ensure your heat pump is properly sized and maintained
4. Seal and insulate your home to reduce heat loss

Q6: Can auxiliary heat cause the system to overheat?  A: Modern heat pumps include safety controls to prevent overheating. However, frequent use may indicate the system is undersized or your home has poor insulation.

5 Common Questions About Auxiliary Heat 

1. Q: What’s the difference between auxiliary heat and emergency heat?
   A: Auxiliary heat automatically engages when the heat pump can’t keep up. Emergency heat is manually activated and bypasses the heat pump entirely.
2. Q: How do I know if auxiliary heat is running?
   A: Most thermostats display an “Aux” or “Emergency Heat” indicator when the system engages.
3. Q: Is auxiliary heat safe?
   A: Yes. It’s built into the system with safety features and only activates as needed.
4. Q: Do I need auxiliary heat in every heat pump system?
   A: Not always. Warmer climates may not require it, but in Thornton, CO, auxiliary heat is recommended for consistent comfort during winter.
5. Q: Does auxiliary heat work with all heat pumps?
   A: Most modern heat pumps include some form of auxiliary heating, either electric coils or gas/propane furnace backup.

Q&A: Maintenance and Troubleshooting on Auxillary Heat                                                                                                Q7: How often should auxiliary heat be inspected? A: During your annual HVAC maintenance, your technician will check the auxiliary heating elements, electrical connections, and operation to ensure reliability.
Q8: What if my auxiliary heat keeps running too often?A: This may indicate:

• Dirty filters or coils
• Low refrigerant levels
• Undersized heat pump
• Poor home insulation
  A licensed HVAC technician should evaluate the system.

Q9: Can auxiliary heat be turned off? A: While some thermostats allow manual control, it’s not recommended to disable auxiliary heat entirely in cold climates, as it can leave your home underheated.

6 Tips for Efficient Auxiliary Heat Use

1. Use a smart thermostat to schedule temperature changes gradually
2. Seal air leaks in windows and doors
3. Insulate your home to reduce heat loss
4. Perform regular heat pump maintenance to maximize efficiency
5. Monitor outdoor temperature settings to prevent unnecessary activation
6. Educate household members on proper thermostat use

 Auxiliary Heat in Thornton, CO  Auxiliary heat is a critical backup system for heat pumps in cold climates like Thornton. When used correctly, it:

• Maintains comfort during extreme cold
• Protects your primary heat pump
• Prevents sudden temperature drops in your home

Proper maintenance, smart thermostat use, and energy-conscious habits help minimize costs while keeping your home warm and efficient.

Call HVAC Thornton Pros for Heat Pump & Auxiliary Heat Support📞 (720) 807-4379

• Auxiliary heat system inspections
• Heat pump repair and maintenance
• Smart thermostat configuration
• Energy-efficient HVAC solutions

Stay warm this winter with professional heat pump and auxiliary heat support!