Are you confused about the difference between the “AUX HEAT” and “EM HEAT” settings on your thermostat? You’re not alone. Many homeowners in Charlotte, NC, accidentally rack up high energy bills by misusing these thermostat modes. At Andersen Heating & Cooling, we’re here to break down how your heat pump operates and explain why using the right thermostat setting is crucial for efficient winter heating.
How Heat Pumps Work in Charlotte, NC
A heat pump is a versatile HVAC system that transfers heat in or out of your home.
- Summer Mode: It works like an air conditioner, removing heat from inside your house and releasing it outdoors.
- Winter Mode: It reverses that process to bring heat inside. However, when outdoor temperatures drop into the 20s or below, there’s less ambient heat available to transfer, so your heat pump needs a little extra help.
Most heat pumps come with a backup heat source—often electric strip heat—to ensure comfort when temperatures plummet. Understanding when to use AUX HEAT and EM HEAT will keep your home cozy while preventing unnecessary wear on your system and avoiding high energy costs.
AUX HEAT: Your Go-To Setting in Cold Weather
When winter temperatures in Charlotte dip, you’ll notice your thermostat automatically switch to AUX HEAT (also called auxiliary heat).
- Automatic Activation: Once the outdoor temperature is too low for the heat pump to efficiently extract heat, your system will activate the electric strip heat to supplement the heat pump.
- Energy Efficiency: As soon as the outdoor temperature rises enough, the system will revert to normal heat pump operation, saving energy and keeping your home warm.
Tip: Let AUX HEAT run on its own. Your thermostat knows the right time to switch between the standard heat pump function and supplemental heat.
EM HEAT: For Emergencies Only
EM HEAT (emergency heat) is a manual setting designed for situations where your heat pump malfunctions or fails completely.
- Manual Operation: If your primary heat pump system is off or broken, switch to EM HEAT to rely solely on the electric strip heat for warmth.
- High Energy Consumption: Because electric resistance heat is less efficient than your heat pump, using EM HEAT for an extended period can significantly increase your energy bills.
Once your heat pump is repaired or restarts, be sure to switch your thermostat back to AUX HEAT (or the regular heat mode). Don’t leave your system in EM HEAT mode unless there’s a genuine emergency.
Common Thermostat Mistakes to Avoid
- Switching to EM HEAT Too Soon: Only use EM HEAT if your heat pump is truly not functioning. Otherwise, AUX HEAT will automatically manage additional heating needs.
- Adjusting the Thermostat Too Frequently: Constantly raising and lowering the temperature can cause the system to overwork and inflate your energy costs.
- Skipping Maintenance: A poorly maintained heat pump can struggle in colder weather. Schedule routine HVAC inspections to keep your system running efficiently.
Trust Andersen Heating & Cooling for Your Winter Comfort
Navigating the differences between AUX HEAT and EM HEAT doesn’t have to be confusing. Whether you need help programming your thermostat, diagnosing a heat pump issue, or scheduling a winter tune-up, Andersen Heating & Cooling is your trusted HVAC partner in Charlotte, NC.
- Expert Technicians: Our team is trained to handle all types of heat pumps and heating systems.
- Fast, Reliable Service: Don’t let a malfunctioning system leave you in the cold. We’re here to help you restore comfort quickly.
- Local Charlotte Pros: We understand the unique needs of our North Carolina climate and can recommend the best solutions for your home.
Call Andersen Heating & Cooling Today!
Ready to stay warm and save on energy bills this winter? Contact Andersen Heating & Cooling for professional thermostat troubleshooting, heat pump maintenance, and 24/7 emergency service.
Phone: 704-596-2525
Don’t let unpredictable winter temperatures catch you off guard—call us now to schedule an appointment or learn more about our HVAC services in Charlotte, NC.
