Few things are more stressful than an HVAC emergency. Whether your air conditioner stops working during a Tennessee heatwave or your furnace suddenly quits on a freezing winter night, losing heating or cooling can quickly become a serious comfort and safety issue.

The good news is that while you wait for professional help, there are several important steps you can take to protect your system, keep your family safe, and possibly prevent further damage.

In this guide, we’ll explain exactly what to do before your emergency HVAC technician arrives, what NOT to do, and when it’s time to call for immediate service.

What Counts as an HVAC Emergency?

Not every HVAC problem requires emergency service, but some situations should never wait.

Common HVAC emergencies include:

• Complete loss of heating during freezing temperatures
• AC failure during extreme summer heat
• Burning smells or electrical odors
• Gas smells near the furnace
• Carbon monoxide detector alerts
• Refrigerant leaks
• Water leaking heavily from the system
• Frozen HVAC systems causing shutdowns
• Loud grinding, screeching, or banging noises

If your system creates a safety risk or leaves vulnerable family members without climate control, call for emergency service immediately.

Step 1: Check the Thermostat First

You’d be surprised how often the issue starts here.

Before assuming your HVAC system has failed:

• Make sure the thermostat is set correctly
• Verify it’s set to “HEAT” or “COOL” (not OFF)
• Replace thermostat batteries if needed
• Lower or raise the setting several degrees to trigger the system

Sometimes a simple thermostat issue can look like a major system failure.

Step 2: Check Your Air Filter

A severely clogged air filter can:

• Restrict airflow
• Cause overheating
• Freeze evaporator coils
• Trigger system shutdowns

If your filter looks dirty, replace it immediately.

This is one of the fastest and easiest ways to potentially restore operation—or at least reduce strain on the system until help arrives.

Step 3: Check the Circuit Breaker

HVAC systems require significant electrical power. Sometimes a breaker trips during storms, power surges, or system strain.

Go to your electrical panel and check for:

• Tripped HVAC breaker
• Partially flipped switches

If tripped:

• Reset the breaker once
• Do NOT repeatedly reset it if it trips again

Repeated tripping indicates a larger electrical issue that requires professional repair.

Step 4: Turn Off the System if You Notice Ice

If your air conditioner is frozen:

• Turn the system OFF immediately
• Switch thermostat fan to ON to help thaw the ice

Running a frozen AC system can damage:

• Compressor
• Refrigerant lines
• Evaporator coil

Allowing the system to thaw before the technician arrives can also help speed up diagnosis.

Step 5: Check Around the Outdoor Unit

For AC or heat pump emergencies:

• Remove debris around the outdoor unit
• Make sure airflow isn’t blocked by leaves, grass, or branches
• Check for visible ice buildup in winter

Restricted airflow can sometimes cause system shutdowns or freezing.

Step 6: Shut Off the System if You Smell Burning or Gas

This is critical.

If You Smell Burning:

• Turn off the HVAC system immediately
• Shut off power at the breaker if safe
• Avoid restarting the unit

If You Smell Gas:

• Leave the home immediately
• Do NOT turn lights on/off
• Do NOT use electronics near the smell
• Call the gas company and emergency HVAC service

Gas leaks are serious safety hazards and should never be ignored.

Step 7: Clear the Area Around Your HVAC Equipment

Before the technician arrives:

• Move boxes or storage items away from the furnace or indoor unit
• Ensure easy access to vents, attic spaces, or utility closets
• Secure pets if necessary

This allows the technician to begin diagnosis immediately and speeds up repair time.

Step 8: Take Notes About the Problem

The more information you provide, the faster the diagnosis.

Helpful details include:

• When the problem started
• Strange noises or smells
• Whether the issue is constant or intermittent
• Any recent repairs or electrical issues
• Whether the system is blowing air or completely dead

This information can significantly shorten troubleshooting time.

What NOT to Do During an HVAC Emergency

Avoid these common mistakes:

❌ Don’t keep restarting the system repeatedly
❌ Don’t continue running a frozen AC
❌ Don’t ignore burning smells
❌ Don’t attempt DIY electrical or gas repairs
❌ Don’t add refrigerant yourself

Attempting improper repairs can:

• Void warranties
• Create safety hazards
• Cause more expensive damage

How Emergency HVAC Problems Often Start

Most HVAC emergencies don’t happen suddenly—they develop over time due to:

• Lack of maintenance
• Dirty filters
• Refrigerant leaks
• Aging systems
• Ignored warning signs

This is why routine maintenance is so important.

The Best Way to Avoid HVAC Emergencies

Preventive maintenance dramatically reduces emergency breakdowns.

At South Nashville Heating & Cooling, our maintenance services include:

• Full system inspections
• Refrigerant checks
• Electrical testing
• Filter replacement
• Coil cleaning
• Safety inspections
• Airflow optimization

Routine tune-ups help identify small issues before they become major emergencies.

Emergency HVAC Service in Nashville You Can Trust

At South Nashville Heating & Cooling, we understand that HVAC emergencies can’t wait.

We provide fast, reliable service for:

• Emergency AC repair
• Furnace and heating emergencies
• Refrigerant leaks
• Frozen systems
• Electrical HVAC problems
• Residential and light commercial systems

Our technicians arrive prepared to diagnose and repair problems quickly—so you can get back to comfort as soon as possible.

Need Emergency HVAC Service? Call South Nashville Heating & Cooling

If your heating or cooling system suddenly stops working, don’t panic—and don’t wait.

👉 Fill out the form below or call South Nashville Heating & Cooling now for fast emergency HVAC service in Nashville.

We’re here to help keep your home safe, comfortable, and running efficiently year-round.

South Nashville HVAC —
“We Keep Your Comfort In Tune!”