Do Heat Pumps Work When It Freezes in Louisiana?

Yes. A heat pump keeps heating your house when the temperature drops below 32 degrees, and it does it well. There is still usable heat in cold air, and the system’s job is to move that heat indoors rather than burn fuel to create it. The colder it gets outside, the harder that job becomes, but it does not simply quit.

What Changes Below Freezing

Two things happen on a cold night in Acadiana, and both of them are normal.

First, the outdoor unit picks up frost. Moisture in our air condenses on the cold outdoor coil and freezes there, which blocks airflow. The system notices and runs a defrost cycle: it briefly reverses itself, warms the outdoor coil, and melts the ice off. You may see steam rolling off the unit and hear a loud whoosh when it switches. The air from your vents can feel cool for a few minutes. Then it goes back to heating. A defrost cycle every 30 to 90 minutes in freezing, damp weather is the system working correctly.

Second, your backup heat may come on. Most Louisiana heat pumps include electric heat strips in the indoor air handler, sometimes labeled auxiliary or AUX on the thermostat. When outdoor temperatures fall far enough, or when the house is trying to recover several degrees at once, those strips add heat so the house keeps up. Seeing AUX on your thermostat during a hard freeze is expected.

How to Help It Through a Cold Snap

We only get a handful of hard freezes along the Gulf Coast, so a few small habits go a long way.

Leave the thermostat at one steady setting. Big overnight setbacks force a long recovery in the morning, and that pulls in the expensive electric strips.

Skip the Emergency Heat switch. That setting shuts the heat pump off entirely and runs on strips alone, which costs far more per hour. Use it only if the outdoor unit is clearly broken.

Keep the outdoor unit clear of leaves and yard debris, and never chip ice off the coil with a tool.

When to Call

If the unit stays coated in ice for hours, if AUX runs constantly in mild weather, or if the air from your vents never turns warm, something is wrong and the fix is not a DIY job. Refrigerant, reversing valves, and defrost boards all take a licensed tech. If your heat pump is old enough that every winter brings a new repair, a properly sized replacement is worth pricing out on our heat pump installation page, or locally in Abbeville and Lafayette. We usually have installation and repair offers running on our specials page, so check there before you schedule.

Either way, call F & R Air Conditioning at (337) 893-5646 and we will tell you straight which one you are looking at.