What should you do first?
For a carbon-monoxide alarm or suspected exposure, get everyone outside to fresh air and call 911. If you smell or hear leaking gas, leave immediately and contact 911 or the local gas authority from outside. For electrical smoke or fire, leave and call 911. Do not stay inside to troubleshoot. Do not re-enter after a carbon-monoxide alarm until emergency responders say it is safe. If you suspect a gas leak, do not operate switches or use a phone while leaving; call from a safe location outside.
Overview
This page separates immediate safety emergencies from urgent residential repair requests. Gas leaks, carbon-monoxide alarms, smoke and fire require emergency services first. Once everyone is safe, a homeowner or authorized decision-maker can ask about heating or cooling repair for the property ZIP. HVAC Repair Dispatch is a connection resource; independent providers confirm coverage, appointment timing and charges. The repair number does not replace emergency services.
Safe observations
- From a safe location, identify whether the issue is loss of cooling, loss of heat, water, unusual sound, odor, or power.
- Check the thermostat display and settings only when there is no gas, smoke, CO, or electrical danger.
- If safe, note the outdoor temperature and whether children, older adults, or medically vulnerable people are affected.
- Keep the equipment off after repeated breaker trips, smoke, strong burning odor, or water near electrical parts.
Warning signs and stop conditions
- Carbon-monoxide alarm or symptoms such as dizziness, nausea, or confusion
- Gas odor or hissing near fuel equipment
- Smoke, sparking, or active burning smell
- Water contacting energized equipment
- No cooling in extreme heat or no heat in freezing conditions
What not to do
- Do not stay inside to troubleshoot or gather equipment details when gas, carbon monoxide, smoke or fire is suspected. Leave and call the appropriate emergency service from safety.
- Do not operate switches, appliances or a phone inside when you suspect a gas leak, and do not search for the leak. Call from a safe location outside.
- Do not ignore a carbon-monoxide alarm or return before emergency responders permit it. Do not restart a suspected faulty fuel-burning appliance before trained personnel have serviced it.
- Do not use a gas oven or range to heat the home, or run a portable generator in or near an enclosed space.
- Do not enter standing water to operate electrical switches or equipment. Have wet electrical equipment inspected by a qualified electrician before it is used again.
Possible causes
Life-safety event
CO, gas, fire, and electrical hazards are emergency-service situations first. HVAC diagnosis comes only after authorities say the property is safe.
Total system failure
Controls, power, ignition, motors, compressors, or safety devices can stop all heating or cooling.
Escalating equipment damage
Repeated breaker trips, severe vibration, ice, or uncontrolled water may indicate a fault that should not be repeatedly restarted.
Professional diagnostic context
- Safety of the work area before equipment testing
- Electrical supply, controls, safeties, and fault history
- Heating ignition and combustion components where applicable
- Motors, compressor, airflow, coils, and drainage
- What can be stabilized now versus what requires parts or follow-up
Repair scenarios
- Loss of cooling with no immediate hazard: describe when cooling stopped, whether airflow continues and any safely observed ice or water. Ask the independent provider to confirm coverage, appointment availability and diagnostic charges.
- Loss of heating with no immediate hazard: explain when heat stopped and what you can observe safely. Ask whether the provider works on the system type and what appointment is available. Do not investigate fuel or electrical components yourself.
- After a suspected gas or carbon-monoxide incident: emergency responders must first say it is safe to return. A suspected faulty fuel-burning appliance must remain out of use until properly serviced by trained personnel. Arrange repair only after addressing the immediate hazard.
What an estimate should explain
- Does the provider serve this property ZIP and work on this type of system?
- What appointment window is currently available?
- Is there a diagnostic, service-call or after-hours fee?
- Who will explain the diagnosis and obtain approval before repair work?
- If parts are unavailable, what follow-up will be needed?
Repair and replacement decisions
Urgency does not automatically mean replacement. Once the immediate risk is controlled, ask for the diagnosis, repair scope, parts availability, and safe temporary options. Compare replacement only when the equipment condition, major-component cost, and remaining service life justify it.
Questions and answers
What counts as an HVAC emergency?
Conditions involving gas, carbon monoxide, smoke, fire, electrical danger, water on electrical equipment, or dangerous indoor temperatures may be emergencies. Gas, CO, and fire hazards require emergency services first.
Is emergency repair available 24 hours?
Not necessarily. Availability varies by location, provider, and time. This site does not claim 24/7 service unless that coverage is specifically confirmed.
Should I turn the HVAC system off if it smells burnt?
If you can do so without approaching smoke, sparks, or danger, stop using the system. Leave and call 911 if there is active smoke, fire, or an immediate electrical hazard.
Can I stay in the home when a CO alarm sounds?
No. CPSC guidance says to get outside immediately and then call 911. Do not re-enter until responders say it is safe.