Is my AC going to fail during an Excessive Heat Warning?

Properly maintained, properly sized AC equipment in Baldwin County handles EHW conditions without failure. Equipment that fails during an EHW typically had marginal components going into the event — capacitors at the bottom of their tolerance range, compressors with worn windings, refrigerant systems with slow leaks. The fall and spring Cool Club tune-ups exist to catch those components before peak-demand conditions expose them.

What temperature should I set my thermostat during an Excessive Heat Warning?

76-78°F is the typical recommendation. The system has a fixed cooling rate; setting it to 65°F doesn't help, and the longer the system runs, the more wear accumulates. If your system can hold 76-78°F through the EHW window, you're in good shape.

Should I call you proactively before the EHW window even if my AC seems fine?

If your spring tune-up is overdue or you've noticed any sign of weakness — longer cycles than last summer, slightly warm registers, condensate drain issues — yes, call before the EHW window. We prioritize EHW pre-event diagnostic calls because catching a marginal component pre-event is meaningfully cheaper than emergency repair during the event itself.

What's the difference between an Excessive Heat Warning and a Heat Advisory?

Heat Advisory is issued at heat-index values of 105°F+ for two consecutive days. Excessive Heat Warning is issued at 110°F+ for two consecutive days — a higher danger tier with broader public-health response. Both produce continuous-runtime conditions for HVAC equipment; EHW conditions are more likely to expose components on the edge of failure.

NWS Excessive Heat Warning · Baldwin County, AL

Excessive Heat Warning HVAC Protocol.

An Excessive Heat Warning is the highest National Weather Service heat alert and the most dangerous HVAC operating environment Baldwin County, Alabama experiences. This page covers what the warning means, what extreme heat does to AC and heat pump equipment, and the protection protocol for the period the warning is in effect. Air Solutions Heating & Cooling, AL#23194. 24/7 emergency line at (251) 300-9817.

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The short version

An NWS Excessive Heat Warning means heat-index values of 110°F or higher are expected. This is the danger tier above a Heat Advisory. AC equipment will run continuously and components on the edge of failure will fail. Three priorities right now: (1) verify your AC is actually keeping up — temperature split (return-to-supply) should hold around 18-22°F; if it's narrowing, call us today. (2) check elderly neighbors and family — a working AC is medical equipment during an Excessive Heat Warning. (3) if cooling fails, call (251) 300-9817 immediately — we prioritize EHW emergency calls and document them as such for cooling-center referral if we can't reach you fast enough.

The condition

What an NWS Excessive Heat Warning Means.

The National Weather Service issues an Excessive Heat Warning when heat-index values are forecast to reach 110°F or higher for at least two consecutive days. This is one tier above a Heat Advisory (105°F+) and one tier below an Excessive Heat Watch's worst-case scenarios. Baldwin County sees Excessive Heat Warnings less often than Heat Advisories — typically 1-3 events per summer in peak years, sometimes zero in milder summers.

EHW is a public-health emergency tier. NWS coordinates with state and local emergency management on cooling-center activation, vulnerable-population outreach, and emergency medical staging during these events. Working AC equipment becomes medical equipment during the period — for elderly residents, infants, and chronic-illness populations, indoor temperatures over 85°F for sustained periods produce serious health risk.

Equipment impact

What It Does to HVAC Equipment.

Components that ran continuously through Heat Advisory conditions and held up will be tested again during the EHW. Fragile components that survived previous events fail during EHW: the marginal capacitor that's been dropping microfarads each summer finally falls below operating range; the compressor with worn windings overheats and shuts down on thermal protection; the refrigerant system with a slow leak crashes low and the system stops producing real cooling.

Salt-air corrosion timelines accelerate during EHW conditions on coastal Baldwin equipment (Gulf Shores, Orange Beach, Fort Morgan). The combination of high humidity, sustained outdoor unit operation, and aerosol salt exposure during these events compresses what would otherwise be months of corrosion progression into a single week. Coastal-grade outdoor units with corrosion-resistant coatings are visibly more reliable through these windows.

Vacation-rental properties carry their own EHW risk profile — peak summer occupancy, doors opening to decks, kids tracking sand in, vacation rental check-outs at 11am and check-ins at 4pm. Continuous AC runtime at full occupancy plus the open-door reality of beach rentals means the cooling load is at the upper bound of what the equipment is sized for, and any equipment-edge component will surface during the warning window.

Before the event

Pre-Event Homeowner Checklist.

Run the same prep checklist as a Heat Advisory — air filter replacement, condenser clearance, steady thermostat setpoint — but also: verify the temperature split right now, before the EHW window opens. Hold a thermometer in a return register, then in a supply register near the air handler, after the system has run for 15 minutes. Healthy split is 18-22°F. If yours is 12-15°F, call us today, not during the EHW.
Check the indoor humidity if you have a hygrometer or a smart thermostat with humidity readout. EHW conditions can drive indoor RH above 65% even with a working AC. If indoor RH is already running above 60% under normal load, a whole-house dehumidifier consultation is worth scheduling for after the EHW passes.
Stage the basics: bottled water, fans, a plan if the AC fails. Identify the closest cooling center (typically a public library, community center, or church facility) and confirm hours during the EHW window. Have a friend or family member you can stay with if needed.
If you have elderly neighbors or family in Baldwin County, plan to check on them during the EHW. Hot indoor environments produce silent, fast-progressing health emergencies in elderly populations — the difference between 86°F and 92°F indoors can be life-threatening.

During the event

While the excessive heat warning Is Active.

Same protocol as Heat Advisory but more critical: thermostat at steady setpoint (76-78°F if cooling capacity allows), all ceiling fans on in occupied rooms, blinds closed on west- and south-facing windows, and doors closed to unused rooms.
Watch for the warning signs of a system on the edge of failure: warm air at registers despite the system running, indoor temperature climbing despite the thermostat dropping setpoint, ice forming on refrigerant lines or the indoor coil, water dripping from ceiling vents, musty smell from registers, or the outdoor unit cycling on and off rapidly. Any of these means call (251) 300-9817 now — don't wait for it to fail completely.
If cooling fails completely during an EHW, the priority order is: (1) call us immediately at (251) 300-9817, (2) move occupants to the coolest part of the house (typically lowest level, interior rooms), (3) plan for cooling-center transport for vulnerable household members if we can't reach you within 2-3 hours.

After the event

Post-Event Equipment Inspection.

After the EHW window closes, run a more thorough inspection than after a normal Heat Advisory: check temperature split again, listen for unusual compressor sounds, verify outdoor unit refrigerant line frost-free during operation, check the condensate drain termination outside for steady drip and clear path.
Schedule a Cool Club tune-up in the next 30 days even if you're not yet a member — EHW conditions expose components and the next tune-up cadence catches the components that survived but lost margin during the event.
If the system handled the EHW with no signs of strain, that's a real success metric — the equipment is sized correctly, maintenance discipline is working, and you're ahead of the failure curve. If it strained, those margins matter for the next event window.

Related Air Solutions resources: emergency HVAC service, AC repair, heating repair, the Cool Club bi-annual maintenance plan, and the full Baldwin County service area.

Excessive Heat Warning HVAC — Frequently Asked Questions

Is my AC going to fail during an Excessive Heat Warning?
Properly maintained, properly sized AC equipment in Baldwin County handles EHW conditions without failure. Equipment that fails during an EHW typically had marginal components going into the event — capacitors at the bottom of their tolerance range, compressors with worn windings, refrigerant systems with slow leaks. The fall and spring Cool Club tune-ups exist to catch those components before peak-demand conditions expose them.
What temperature should I set my thermostat during an Excessive Heat Warning?
76-78°F is the typical recommendation. The system has a fixed cooling rate; setting it to 65°F doesn't help, and the longer the system runs, the more wear accumulates. If your system can hold 76-78°F through the EHW window, you're in good shape.
Should I call you proactively before the EHW window even if my AC seems fine?
If your spring tune-up is overdue or you've noticed any sign of weakness — longer cycles than last summer, slightly warm registers, condensate drain issues — yes, call before the EHW window. We prioritize EHW pre-event diagnostic calls because catching a marginal component pre-event is meaningfully cheaper than emergency repair during the event itself.
What's the difference between an Excessive Heat Warning and a Heat Advisory?
Heat Advisory is issued at heat-index values of 105°F+ for two consecutive days. Excessive Heat Warning is issued at 110°F+ for two consecutive days — a higher danger tier with broader public-health response. Both produce continuous-runtime conditions for HVAC equipment; EHW conditions are more likely to expose components on the edge of failure.

Schedule HVAC service · Excessive Heat Warning response

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Same-day weekday appointments most of the year. 24/7 emergency line at (251) 300-9817 — Reaves or one of the techs answers directly during excessive heat warning events.

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Need someone right now? Call (251) 300-9817 — Reaves or one of the techs picks up the 24/7 emergency line directly.

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HVAC Emergency During a Excessive Heat Warning?

Call (251) 300-9817 — we answer 24/7. Cool Club members get prioritized routing during peak demand.

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