Ecobee Thermostat Aux Heat Runtime Alert: How to Fix It

Q: Why does my Ecobee keep using auxiliary heat?

Your Ecobee uses auxiliary heat when the heat pump can't meet heating demand efficiently, typically due to very cold outdoor temperatures, rapid temperature changes, dirty filters, or incorrect thermostat settings. The system automatically switches to auxiliary heat to maintain comfort when the heat pump alone isn't sufficient.

Q: What temperature should auxiliary heat turn on?

Auxiliary heat should typically activate when outdoor temperatures drop below 25-35°F, depending on your heat pump's capacity and efficiency. This threshold can be adjusted in your Ecobee's installation settings. Setting it too high causes unnecessary energy usage, while setting it too low may result in inadequate heating.

Q: How much more expensive is auxiliary heat?

Auxiliary heat (usually electric resistance heating) costs 2-3 times more to operate than heat pump heating. For example, if your heat pump heating costs $0.10 per hour, auxiliary heat might cost $0.25-$0.30 per hour. Minimizing auxiliary heat usage can significantly reduce winter energy bills.

Q: Can I disable the auxiliary heat runtime alert?

Yes, you can disable auxiliary heat alerts in your Ecobee's Settings under Alerts & Reminders. However, keeping this alert enabled helps you monitor system efficiency and catch potential problems early. Consider adjusting the threshold instead of disabling it completely.

Q: Is auxiliary heat bad for my system?

Auxiliary heat isn't inherently bad for your system - it's designed to supplement your heat pump when needed. However, excessive auxiliary heat usage indicates inefficiency, higher energy costs, or potential system issues that should be addressed to maintain optimal performance and comfort.

Abstract

The Ecobee Aux Heat Runtime Alert appears when your heat pump is relying too heavily on auxiliary heating, which is less efficient and more expensive than normal heat pump operation. This alert helps you identify when your system isn't running optimally, potentially costing you hundreds of dollars in extra energy bills.