What Is EM Heat? When Should You Use Emergency HeatIf you have a heat pump system in your Littleton home, you may have noticed a thermostat setting labeled “EM Heat” or “Emergency Heat.” Many homeowners are unsure what it does — and using it incorrectly can lead to very high energy bills.
This guide from HVAC Littleton explains what EM Heat is, when to use emergency heat, when NOT to use it, and how it impacts your heating system during Colorado winters. What Is EM Heat (Emergency Heat)?EM Heat, short for Emergency Heat, is a backup heating mode used with heat pump systems when the primary heat pump stops working properly. Instead of using the outdoor heat pump to extract heat from the air, EM Heat switches to a secondary heat source, typically:
Featured Snippet Answer:Emergency Heat is a backup heating mode that bypasses the heat pump and uses a secondary heat source to warm your home when the heat pump fails or cannot operate efficiently. How Does Emergency Heat Work?When EM Heat is activated:
When Should You Use Emergency Heat in Littleton, CO?You should only use Emergency Heat in specific situations, not for everyday heating. Use EM Heat If:1. Your Heat Pump Is Not WorkingIf your heat pump is broken, damaged, or not producing heat, EM Heat keeps your home warm until repairs are made. 2. The Outdoor Unit Is Frozen or Iced OverColorado winters can cause ice buildup that prevents proper operation. If the defrost cycle fails, EM Heat may be necessary temporarily. 3. Your HVAC Technician Instructs You ToAfter diagnosing a system issue, a professional may recommend using EM Heat until repairs are completed. When NOT to Use Emergency HeatMany homeowners mistakenly think EM Heat is for extremely cold weather — this is not true. Do NOT Use EM Heat If:
Emergency Heat vs Auxiliary Heat: What’s the Difference?This is one of the most searched HVAC questions. Aux Heat (Auxiliary Heat):
Why Emergency Heat Is Expensive to RunEmergency Heat relies on electric resistance heating, which: In Littleton homes, running EM Heat continuously can increase heating bills by 30–60% or more. How Long Can You Safely Use EM Heat?Emergency Heat should be used only short-term, typically: Long-term use can:
Signs You Should Call an HVAC Professional ImmediatelyContact HVAC Littleton if:
Is Emergency Heat Safe to Use?Yes — when used correctly and temporarily. However, improper or prolonged use can:
Heat Pump Performance in Littleton’s ClimateLittleton’s cold winters, dry air, and elevation can challenge older heat pumps. Modern cold-climate heat pumps perform better, but proper maintenance and correct thermostat use are critical. Upgrading to a high-efficiency heat pump or dual-fuel system can significantly reduce reliance on Emergency Heat. Professional Heat Pump Service in Littleton, COIf your system frequently requires EM Heat, it’s a sign something isn’t right. HVAC Littleton provides:
📞 (720) 500-6484 Frequently Asked Questions about EM HeatShould I turn on Emergency Heat when it’s very cold?No. EM Heat should only be used if the heat pump is not working. Does Emergency Heat warm the house faster?It may feel faster, but it is far less efficient and much more expensive. Why did my thermostat switch to EM Heat?It usually doesn’t switch automatically. If it did, there may be a system fault. Is Emergency Heat bad for my system?Occasional use is fine. Frequent use indicates a problem that needs repair. Emergency Heat is exactly what the name suggests — for emergencies only. Using it correctly protects your HVAC system, lowers energy bills, and keeps your Littleton home comfortable during winter. If you’re unsure whether your system should be using EM Heat, professional guidance can save you money and prevent breakdowns.
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