Understanding the Emergency Heat Setting on Your Thermostat

If you own a heat pump in Belmont, you have probably noticed an “EM Heat” button on your thermostat and wondered what it actually does. Most homeowners never touch it, and the ones who do often flip it on for the wrong reason.

At Gerald Griffin Heating and Cooling, we field this exact question every winter. This guide walks through what emergency heat really is, when it helps, and when it quietly doubles your power bill.

What Emergency Heat Setting Actually Means

Emergency heat is a backup heating mode built into thermostats that control heat pump systems. When you turn it on, it shuts your heat pump off completely and forces the system to run on its secondary heat source instead.

That secondary source is usually electric heat strips or a gas furnace. It will keep your home warm, but it does the job in the most expensive way your system can manage. Emergency heat was designed for one specific situation: when your heat pump has failed and you still need to stay warm.

How Your Heat Pump Normally Keeps You Warm

To understand emergency heat, it helps to know how your heat pump works in the first place. Unlike a furnace that burns fuel to create heat, a heat pump simply moves existing heat from the outdoor air into your home.

This method is very efficient and works well even on cold days, which is why heat pumps handle most of a North Carolina winter with ease. There is usable warmth in outdoor air even when the temperature feels low, and your system pulls that warmth indoors.

The trade-off appears as temperatures approach freezing. When the outside air gets too cold to supply enough heat on its own, your system needs backup support to keep up. This is the exact moment where most homeowners get confused about which setting to use.

Emergency Heat vs Auxiliary Heat

These two terms sound almost identical, but they behave very differently. Mixing them up is the single most common heat pump mistake we see across Belmont and Gastonia homes.

Here is the simple breakdown:

• Auxiliary heat switches on automatically. Your system adds a burst of backup heat only when the heat pump needs help, then shuts it off once the home reaches temperature.
• Emergency heat is a manual override. You turn the heat pump off entirely and run only on backup heat until you switch it back yourself.

Auxiliary heat is a helper that works quietly alongside your heat pump. Emergency heat is a full replacement that runs the costly backup source nonstop. One is your system being smart on its own, and the other is you taking manual control for a very specific reason.

When You Should Actually Use Emergency Heat

Emergency heat exists for real breakdowns, not for chilly weather. You should only turn it on when your heat pump physically cannot do its job anymore.

Good reasons to use emergency heat include:

• Your heat pump has stopped running and is blowing cold air or no air at all.
• The outdoor unit is frozen solid, damaged, or buried under ice and snow.
• You hear grinding, screeching, or other loud noises and shut the unit down.
• A technician has told you to run emergency heat until a repair is finished.

In every one of these cases, emergency heat is doing exactly what it was built to do. It keeps your family comfortable while the heat pump is out of service. Think of it as a short-term bridge that carries you to your repair, not a setting you leave on all season.

When You Should Never Touch It

Here is the part that protects your budget. Do not switch to emergency heat simply because it is cold outside.

Your heat pump is engineered to handle Belmont winters on its own, and it will call for auxiliary heat automatically whenever it needs a little extra. Turning on emergency heat while the system is working fine forces everything onto the expensive backup for no good reason, and the result lands on your next power bill.

Emergency heat can pull two to three times more energy than normal heat pump operation. A few days of accidental use is enough to noticeably raise your monthly cost, and leaving it on for weeks can be a genuine shock when the statement arrives. If your home simply feels slow to warm on a cold morning, that is usually normal behavior, not a reason to override the system.

Warning Signs You Should Call a Professional

Sometimes emergency heat is a symptom of a larger problem rather than a simple setting choice. If any of the following happen, it is smarter to call a technician than to leave the backup running and hope it sorts itself out.

Keep an eye out for these signs:

• Your thermostat switches to backup or emergency heat and refuses to switch back.
• The system runs constantly but the house never reaches the set temperature.
• You smell burning or hear unusual noises when the backup heat kicks on.
• Your power bill jumps sharply with no change in how you use your system.
• The outdoor unit ices over repeatedly and the defrost cycle never clears it.

These issues often point to a failing compressor, a refrigerant leak, a stuck reversing valve, or a wiring fault. Guessing at the cause usually makes the situation worse and more expensive. The team at Gerald Griffin Heating and Cooling can diagnose why your system keeps leaning on backup heat and fix the root of the problem, so you are not stuck paying emergency heat prices all winter long.

What Emergency Heat Costs Belmont Homeowners

Belmont, Mt. Holly, Stanley, and Gastonia all see their share of cold snaps, but our winters are simply not harsh enough to justify running backup heat around the clock. That is exactly what makes accidental emergency heat so costly in our area.

A properly working heat pump handles the vast majority of our heating days efficiently and quietly. The moment you override it with emergency heat, you toss that efficiency aside and pay premium rates for warmth your system could have delivered far more cheaply on its own.

A quick habit goes a long way here. Glance at your thermostat every so often during winter, and if you see “EM Heat” lit up without you turning it on for a breakdown, treat that as a red flag worth checking out right away.

Getting the Most From Your Heat Pump This Winter

A handful of simple practices keep your system efficient and your bills predictable through the coldest months. None of them require any special tools, just a little attention.

Try to build these habits into your routine:

• Leave your thermostat in normal heat mode and trust the auxiliary function to handle cold snaps.
• Keep the outdoor unit clear of leaves, snow, and debris so it can breathe properly.
• Change your air filter regularly to protect airflow and overall efficiency.
• Schedule a seasonal tune-up with Gerald Griffin Heating and Cooling before winter fully sets in.

Routine maintenance is your best defense against ever needing emergency heat in the first place. A well-serviced heat pump is far less likely to fail on the coldest night of the year, which is precisely when a breakdown would hurt the most.

Staying Warm Without the Second-Guessing

Emergency heat is a genuinely useful safety net, but only when you use it the right way. Treat it as short-term backup for a broken heat pump, never as a shortcut for cold weather, and both your system and your wallet will come out ahead every winter.

If your heat pump keeps defaulting to backup heat, will not hold temperature, or has left you puzzling over a confusing thermostat, do not wait for the bill to tell you something is wrong. Call Gerald Griffin Heating and Cooling at (980) 277-5122 for heat pump repair, maintenance, and straight answers across Belmont, Mt. Holly, Gastonia, and the surrounding communities.