What Is Aux Heat?

Are you curious to know what is aux heat? You have come to the right place as I am going to tell you everything about aux heat in a very simple explanation. Without further discussion let’s begin to know what is aux heat?

In the realm of heating and cooling systems, the term “Aux Heat” often appears, leaving many homeowners curious about its function and significance. Let’s delve into the world of HVAC technology and unravel the mysteries of Aux Heat for a more comfortable and energy-efficient home.

What Is Aux Heat?

Aux Heat, short for auxiliary heat, is a feature commonly found in modern HVAC (Heating, Ventilation, and Air Conditioning) systems. It serves as a supplemental heating source to the primary heating system, ensuring optimal comfort during extremely cold weather conditions.

What Is Aux Heat On A Thermostat?

On a thermostat, Aux Heat refers to the activation of the auxiliary heating system. This typically occurs when the primary heat source, such as a heat pump, is unable to meet the heating demand. The thermostat activates Aux Heat to provide additional warmth and maintain a comfortable indoor temperature.

What Is Aux Heat On A Heat Pump?

In the context of a heat pump, Aux Heat becomes especially relevant during colder periods. Heat pumps extract heat from the outdoor air, and as temperatures drop, their efficiency decreases. Aux Heat, often in the form of electric resistance heat, kicks in to supplement the heat pump’s capacity and ensure consistent warmth indoors.

What Is Aux Heat Mean?

Aux Heat, or auxiliary heat, means the activation of an additional heating source to support the primary heating system. It is a responsive feature designed to enhance comfort and maintain a desired temperature when the primary heat source alone may be insufficient.

Is It Bad If Auxiliary Heat Comes On?

The activation of auxiliary heat is not inherently bad; in fact, it serves a crucial purpose during extreme cold weather. However, continuous reliance on auxiliary heat can lead to increased energy consumption and higher utility bills. Monitoring and optimizing the use of Aux Heat is key to maintaining an energy-efficient home.

Aux Heat On But No Heat:

If Aux Heat is on but there’s no noticeable increase in warmth, it could indicate a potential issue with the heating system. This may include a malfunction in the auxiliary heating elements or a problem with the thermostat. Professional inspection and maintenance are recommended to address the issue promptly.

How Do I Stop My Auxiliary Heat From Coming On?

To prevent unnecessary use of auxiliary heat, homeowners can take several steps. These include ensuring proper insulation, sealing any drafts, and regularly maintaining the heating system. Additionally, adjusting thermostat settings and programming can help optimize the use of auxiliary heat based on individual preferences.

What Is Aux Heat Vs. Auxiliary Heat?

“Aux Heat” and “Auxiliary Heat” are interchangeable terms, both referring to the supplemental heating system activated when needed. Understanding these terms is essential for homeowners to interpret thermostat readings and make informed decisions about their heating systems.

To know more about such interesting things explore queryplex.

What Is Aux Heat Thermostat?

The Aux Heat setting on a thermostat allows users to control and customize the activation of auxiliary heat. This setting is particularly useful during colder seasons, ensuring that the home remains comfortably warm without unnecessary energy consumption.

How To Fix Aux Heat On Thermostat:

If there are issues with the Aux Heat setting on a thermostat, homeowners can follow some troubleshooting steps. These include checking thermostat settings, inspecting the heating system for any faults, and ensuring that the thermostat is compatible with the HVAC system. If problems persist, professional HVAC assistance may be required.

Aux Heat Comes On In Cool Mode:

If Aux Heat activates while the HVAC system is in cooling mode, it may indicate a thermostat wiring issue or a malfunction in the system. This scenario requires immediate attention to prevent energy wastage and potential damage to the heating and cooling components.

What Temperature Should Auxiliary Heat Come On?

The temperature at which auxiliary heat comes on can vary based on the thermostat settings and individual preferences. Typically, it activates when the primary heat source, like a heat pump, is unable to maintain the desired indoor temperature. Users can adjust settings to optimize energy efficiency without sacrificing comfort.


In conclusion, understanding what Aux Heat is and how it functions is crucial for homeowners looking to optimize their HVAC systems. By being aware of when and why auxiliary heat comes on, individuals can make informed decisions to enhance both comfort and energy efficiency in their homes. Regular maintenance, thermostat adjustments, and awareness of system behavior are key elements in ensuring the effective and efficient operation of auxiliary heat in HVAC systems. So, the next time Aux Heat kicks in, embrace the warmth and appreciate the technology working to keep your home cozy.


Is It Ok To Run Auxiliary Heat?

Auxiliary heat is less energy-efficient than your heat pump, and it is meant to only run for short periods when temperatures drop. Prolonged use of aux heat can cause your utility bill to be much higher than it needs to be.

Is Aux Heat More Expensive?

That’s because heat pumps must work extra hard to meet and maintain set temperatures. Aux heat will run more frequently in such situations, sending heating bills skyrocketing.

Why Is Aux Heat Coming On?

Aux heat will kick on when your heat pump cannot deliver enough warmth to heat your home. Typically, your heat pump will energize the auxiliary heat strip inside your secondary heating source to help reach its set temperature faster.

How Long Does Aux Heat Stay On?

Auxiliary heat stays on for roughly two hours at a time. It’s only a secondary heat source, so your regular heating system should suffice once the auxiliary heat has provided enough heat to reach your thermostat’s set temperature.

I Have Covered All The Following Queries And Topics In The Above Article

What Is Aux Heat Nest

What Is Aux Heat On Thermostat

What Is Aux Heat On A Heat Pump

What Is Aux Heat Mean

Is It Bad If Auxiliary Heat Comes On

Aux Heat On But No Heat

How Do I Stop My Auxiliary Heat From Coming On

What Is Aux Heat Vs Auxiliary Heat

What Is Aux Heat Thermostat

How To Fix Aux Heat On Thermostat

Aux Heat Comes On In Cool Mode

What Temperature Should Auxiliary Heat Come On

What Is Aux Heat