Air Solutions Field Guide · emergency

Heat Out on a Cold Night in Gulf Shores? What to Do First

Heat pump quit on a cold Gulf Shores night — or is it just defrosting? How to tell normal defrost from a real failure, first checks, the emergency-heat setting, and when to call.

Reaves Nelson
By Reaves NelsonFounder & Owner
July 16, 2026 · 6 min read
Air Solutions technician inspecting an open residential gas furnace at a Gulf Shores, Alabama home, illustrating "Heat Out on a Cold Night? What to Do First"

A cold snap rolls into Gulf Shores a handful of nights a year, and that's usually when somebody steps outside, sees their heat pump wreathed in steam and blowing what feels like cool air for a minute, and assumes it's dying. Before you panic — or worse, before you start flipping switches — it's worth knowing that what you're watching might be the system working exactly as designed. Then again, it might not be. Telling those two apart is the first and most useful thing you can do tonight.

So let's start there, then move through the checks and the call.

Normal defrost, or a real failure?

A heat pump pulls warmth from outdoor air even when it's cold. On a chilly, damp Gulf Coast night, the same Mobile Bay humidity that defines summer here works against you in reverse: frost builds up on the outdoor coil, so the system periodically runs a defrost cycle to melt it off — and that cycle looks alarming if you don't know what it is. Homes from West Beach to Craft Farms run almost pure cooling most of the year, so the heating side gets little exercise, which is part of why a routine defrost catches so many people off guard.

A real failure, by contrast, looks like: no warm air at all for an extended stretch (not just a few minutes), the outdoor unit completely dead and silent when it should be running, a coil that stays fully encased in thick ice cycle after cycle, repeated breaker trips, or any burning smell. Those are reasons to dig further.

Run these first checks

If it's clearly not just defrost, rule out the simple causes before assuming the worst.

  1. Recheck the thermostat
    Set it to HEAT, several degrees above the current room temperature, fan on AUTO. A dim or blank display points to a dead battery — change it. Confirm nobody left it on COOL or a hold.
  2. Reset the breaker once
    Find the heat-pump and air-handler breakers and reset a tripped one a single time. If it trips again right away, leave it — that's a fault the system is protecting you from, not something to force.
  3. Check the filter
    A clogged filter chokes airflow and can keep the indoor unit from delivering heat. If light barely passes through, replace it before you try again.
  4. Give the outdoor unit a quick look
    Some steam and a paused fan are normal defrost. A unit buried in solid ice through multiple cycles, or one that's dead silent when it should run, is not. Don't pour water on it or chip at ice — just note what you see for the tech.

The emergency-heat setting — what it does

Most heat-pump thermostats have an Emergency Heat (often "Em Heat" or "Aux") mode, and a cold night is when people reach for it. Here's the honest version of what it does: it bypasses the heat pump entirely and runs only the backup electric heat strips (or, in some homes, a furnace). That keeps you warm if the heat-pump portion has genuinely failed — so it's a reasonable stopgap to get heat into the house overnight while you wait for a tech.

Two things to keep in mind. First, emergency heat is less efficient than normal heat-pump operation, so it's a hold-you-over setting, not a permanent one. Second — and this is the useful tell — if switching to Emergency Heat does warm the house, that's a strong sign the trouble is in the heat-pump side of the system specifically, which is helpful information to hand the tech. If even emergency heat gives you nothing, the problem may be electrical or in the air handler.

Staying safe and warm while you wait

Whatever the cause, keep everyone comfortable the right way. Pile on layers, gather into one room, and shut doors to the rest of the house to concentrate the warmth. Pull the blinds to slow heat loss through glass. If you use a portable space heater, set it on a hard, level surface well clear of anything that burns, plug it directly into the wall, and never leave it running unattended or overnight. And one hard line: don't ever heat the house with the oven, a gas range, a grill, or a generator indoors — they release carbon monoxide, which you can't see or smell, and that's never a trade worth making.

When to call tonight

A healthy household can usually ride out a cold coastal night and call in the morning, especially if emergency heat is holding the house. Lean toward calling tonight if the home is getting genuinely cold and someone inside is very young, elderly, or managing a health condition. And call right away — before anything else — if you smell gas (step outside first) or smell burning from the system. When you're not sure, describe what you're seeing over the phone and we'll help you judge it.

Ready for heat pump help in Gulf Shores?

Air Solutions Heating & Cooling is a family-run company based in Daphne, licensed AL#23194 and BBB A-rated. We serve Gulf Shores and the coast, keep a 24/7 emergency line, and give no-heat calls same-day priority whenever we can — with timing confirmed by phone.

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Questions. Answered.

  • My heat pump is steaming and blowing cool air — is it broken?
    Probably not. On a chilly, damp coastal night, frost builds on the outdoor coil and the system periodically runs a defrost cycle to melt it. During a normal defrost the outdoor unit may billow steam (that's frost melting, not smoke), the outdoor fan often pauses for a few minutes, and indoors the air can go briefly cool as the system reverses. It usually lasts only a few minutes, then heating resumes and the vents warm back up.
  • How do I tell a normal defrost from a real failure?
    A real failure looks different: no warm air at all for an extended stretch rather than a few minutes, the outdoor unit completely dead and silent when it should be running, a coil that stays encased in thick ice cycle after cycle, repeated breaker trips, or any burning smell. Steam, a quiet outdoor fan, and a short cool spell are usually the system doing its job — those other signs are reasons to dig further.
  • What does the Emergency Heat setting actually do?
    Emergency Heat — sometimes labeled Em Heat or Aux — bypasses the heat pump entirely and runs only the backup electric heat strips, or in some homes a furnace. It keeps you warm overnight if the heat-pump portion has genuinely failed, so it's a reasonable stopgap while you wait for a tech. It's less efficient than normal operation, so treat it as a hold-you-over setting, not a permanent one.
  • If emergency heat warms the house, what does that tell me?
    It's a useful tell. If switching to Emergency Heat does warm the house, that points to trouble in the heat-pump side of the system specifically, which is helpful information to hand the tech. If even emergency heat gives you nothing, the problem may be electrical or in the air handler instead.
  • When should I call tonight instead of waiting until morning?
    A healthy household can usually ride out a cold coastal night and call in the morning, especially if emergency heat is holding the house. Lean toward calling tonight if the home is getting genuinely cold and someone inside is very young, elderly, or managing a health condition. Call right away if you smell gas — step outside first — or smell burning from the system.
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