HVAC Emergency Response

Homeowner Summary

HVAC emergencies become life-threatening when they occur during extreme weather. Losing heat during a winter cold snap can lead to frozen pipes (thousands of dollars in damage), hypothermia (especially for elderly residents, infants, and those with medical conditions), and carbon monoxide poisoning from improper use of alternative heating sources. Losing air conditioning during extreme heat can cause heat exhaustion and heat stroke, which kills more Americans annually than any other weather event.

The most dangerous aspect of HVAC emergencies is not the discomfort — it is the desperate measures people take to compensate. Running a generator indoors, using an oven for heat, operating unvented gas heaters in closed spaces, and using charcoal grills inside are responsible for hundreds of carbon monoxide deaths every year. Understanding safe alternatives and knowing when to leave your home is essential.

An HVAC failure is usually an inconvenience, not an emergency. It becomes an emergency when temperatures inside the home reach dangerous levels (below 50F or above 90F for extended periods), when vulnerable occupants are present, when pipes are at risk of freezing, or when the failure involves gas or carbon monoxide.

IMMEDIATE EMERGENCY ACTIONS

No Heat in Winter

If outdoor temperatures are below 32F (0C) and your heating system fails:

1. Check the obvious first: Thermostat set to HEAT and above current room temp? Batteries fresh? Circuit breaker for furnace/heat pump tripped? Gas valve to furnace open? Filter clean? (A severely clogged filter will shut down the system on safety lockout)

2. If the system will not restart: Call your HVAC dealer for emergency service. Most dealers offer 24/7 emergency heat calls during winter

3. While waiting for repair — safe heating alternatives:

   • Electric space heaters: maintain 3-foot clearance from all combustible materials (curtains, bedding, furniture, clothing). Plug directly into wall outlet — NEVER use an extension cord. Do not leave unattended. Turn off when sleeping or leaving the room
   • Fireplace: Open the damper fully before lighting. Use a fireplace screen. Never leave a fire unattended. Ensure chimney has been inspected within the past year
   • Layer clothing, use blankets, gather household members in one room (body heat helps)

4. What NEVER to do for heat:

   • NEVER use your oven or stovetop for heat — gas ovens produce carbon monoxide, electric ovens are a fire hazard
   • NEVER run a generator indoors or in an attached garage — carbon monoxide is odorless and kills within minutes in enclosed spaces. Generators must be at least 20 feet from any window, door, or vent
   • NEVER use a charcoal or gas grill indoors — produces lethal levels of CO
   • NEVER use unvented gas space heaters in a closed room without adequate ventilation
   • NEVER leave portable heaters running while sleeping — fire and CO risk

5. Protect pipes from freezing (see section below)

6. Consider evacuation if indoor temperature drops below 50F (10C) and repair will take more than a few hours — especially if elderly persons, infants, or medically vulnerable individuals are present. Go to a friend/family member's home, a hotel, or a community warming center

Pipe Freeze Prevention During Heating Failure

Frozen pipes burst and cause devastating water damage. Take these steps immediately when heat fails in freezing weather:

1. Open cabinet doors under kitchen and bathroom sinks (especially on exterior walls) to allow warm room air to reach pipes
2. Let faucets drip — both hot and cold — at a slow, steady trickle. Moving water resists freezing. Focus on faucets fed by pipes running through exterior walls, crawlspaces, or unheated areas
3. Set thermostats to at least 55F (13C) — this is the minimum safe temperature to prevent pipe freezing. If heat is completely out, this is not possible, so dripping faucets and opening cabinets are your primary defenses
4. Insulate exposed pipes in crawlspaces, attics, and garages with pipe insulation sleeves, towels, or newspaper as a temporary measure
5. Shut off water to unoccupied portions of the home and drain those lines if possible
6. If you are leaving the home (hotel, family): Do NOT turn off the heat entirely. Keep it at 55F minimum. If heat is completely non-functional, shut off water at the main valve and drain the system by opening all faucets

If pipes have already frozen (no water flow):

• Do NOT use a torch or open flame to thaw — fire hazard
• Use a hair dryer, heat lamp, or warm towels on the frozen section
• Open the faucet that the frozen pipe feeds — as ice melts, flowing water helps thaw the rest
• If you cannot locate or access the frozen section, call a plumber
• If a pipe has burst: Shut off water at the main valve immediately. See emergencies/water-main-break.md

No AC in Extreme Heat

When outdoor temperatures exceed 95F (35C) and your cooling system fails:

1. Check the obvious first: Thermostat set to COOL and below current room temp? Breaker tripped? (Check both the indoor air handler breaker and the outdoor condenser breaker) Outdoor unit running? Air filter clean?

2. If the system will not restart: Call your HVAC dealer. Explain that it is an extreme heat situation — most dealers prioritize these calls

3. Cool the home without AC:

   • Close blinds and curtains on sun-facing windows (reduces heat gain by 30-45%)
   • Open windows at night when outdoor temp drops below indoor temp. Close windows and blinds during the day
   • Use fans to circulate air (fans cool people through evaporation, not rooms — turn them off in unoccupied rooms)
   • Wet a towel with cold water and drape over your neck or place in front of a fan
   • Stay on the lowest floor (heat rises)
   • Minimize heat sources: avoid cooking with the oven, turn off unnecessary lights and electronics
   • Take cool showers or baths
   • Stay hydrated — drink water frequently even if not thirsty

4. Recognize heat-related illness:

   • Heat exhaustion: Heavy sweating, cold/clammy skin, weak pulse, nausea, muscle cramps, headache, dizziness. TREATMENT: Move to cooler area, loosen clothing, sip water, apply cool cloths. If symptoms persist beyond 1 hour, call 911
   • Heat stroke: Body temperature 103F (39.4C) or higher, hot/red/dry skin (NO sweating), rapid strong pulse, confusion, slurred speech, loss of consciousness. THIS IS A LIFE-THREATENING EMERGENCY — CALL 911 IMMEDIATELY. Move person to cooler area, apply cold water or ice to neck, armpits, and groin. Do NOT give fluids if person is confused or unconscious

5. Consider evacuation to an air-conditioned location: mall, library, community cooling center, friend/family home. Especially critical for elderly (65+), infants, people with heart/respiratory conditions, and those taking medications that impair heat regulation

Gas Furnace Failure with CO Risk

If your gas furnace makes unusual noises, produces visible soot, emits strange odors (not mercaptan/gas smell), or your CO detector alarms:

1. Shut off the furnace at the thermostat (set to OFF) and at the furnace power switch (usually a light switch on or near the furnace)
2. If CO detector is alarming: Evacuate immediately. See emergencies/carbon-monoxide-emergency.md
3. If you smell gas: Follow gas leak procedures. See emergencies/gas-leak.md
4. Do NOT restart the furnace until an HVAC technician has inspected it
5. Common CO-producing failures: Cracked heat exchanger (most dangerous — allows combustion gases into living space), blocked exhaust flue, malfunctioning inducer motor, improper combustion (yellow/flickering flame instead of steady blue)

Refrigerant Leak Signs

• Hissing or bubbling sound near the indoor or outdoor HVAC unit (refrigerant escaping under pressure)
• Ice forming on refrigerant lines (suction line icing indicates low refrigerant charge)
• Reduced cooling performance (system runs but does not cool effectively)
• Higher electricity bills (system works harder with low refrigerant)
• Sweet, chemical smell near the indoor unit (some refrigerants have a faint odor)

Response: Turn off the system to prevent compressor damage (running with low refrigerant can destroy the compressor — a $1,500-$3,500 repair). Call an HVAC technician. Refrigerant handling requires EPA Section 608 certification — this is not a DIY repair.

Warning Signs (Before an Emergency)

• HVAC system short-cycling (turning on and off frequently)
• Unusual noises: banging, grinding, squealing, or clicking
• Uneven heating/cooling between rooms
• System running continuously without reaching setpoint
• Visible rust or corrosion on furnace or outdoor unit
• Yellow or flickering pilot/burner flame (should be steady blue)
• Increased energy bills without usage change
• Age: systems over 15 years are at higher risk of sudden failure
• Thermostat showing different temperature than the room feels

Cost Guide

| Service | Typical Range | Key Factors | |---------|--------------|-------------| | Emergency HVAC service call | $200-$500 | After-hours premium, travel | | Capacitor replacement | $150-$400 | Part + labor | | Blower motor replacement | $400-$1,200 | Motor type, labor | | Refrigerant recharge | $200-$600 | Refrigerant type, amount needed | | Heat exchanger replacement | $1,500-$3,500 | Often makes more sense to replace furnace | | Compressor replacement | $1,500-$3,500 | Brand, refrigerant type | | Emergency pipe thawing | $200-$600 | Access, extent | | Burst pipe repair (after freeze) | $200-$2,000 | Location, damage extent | | Portable space heater | $30-$150 | Type, wattage | | Portable AC unit | $300-$700 | BTU capacity |

Shipshape Integration

Shipshape provides proactive HVAC emergency prevention and response:

• Temperature Monitoring: Smart thermostat integration detects when indoor temperature drops below 55F (freeze risk) or rises above 85F (heat risk), triggering alerts even when homeowners are away
• Freeze Alerts: When outdoor temperature is forecast to drop below 28F and HVAC system is not running (or is failing to maintain temperature), Shipshape sends proactive freeze prevention alerts with pipe protection steps
• HVAC Failure Detection: Unusual runtime patterns (system running constantly, short-cycling, or not running during extreme weather) trigger diagnostic alerts to homeowner and dealer
• CO Detector Integration: Carbon monoxide detector alarms trigger immediate emergency alerts with evacuation instructions. See emergencies/carbon-monoxide-emergency.md
• Emergency Dealer Routing: HVAC failure alerts route to the assigned HVAC dealer with equipment details (brand, model, age, maintenance history) for rapid diagnosis and response
• Home Health Score: HVAC age, maintenance status, and system performance factor into the score. Systems approaching end-of-life (15+ years) receive proactive replacement recommendations before emergency failure
• Seasonal Prep Reminders: Pre-winter and pre-summer maintenance reminders ensure systems are inspected and serviced before extreme weather arrives — the best emergency is one that never happens
• Vulnerable Occupant Flagging: Homes with elderly occupants, infants, or medical conditions can be flagged for priority emergency response and lower-threshold temperature alerts