24/7 Emergency HVAC Repair in Kirkwood and West St. Louis County
Emergency HVAC repair is fundamentally different from scheduled service. It’s 11 PM on January 6, the outdoor temperature is 4°F, the furnace stopped 90 minutes ago, indoor temperature has already dropped to 58°F, and there’s an 84-year-old grandmother and a 6-week-old infant in the home. The question isn’t whether to schedule a service visit — it’s how fast a technician can be on-site with the right parts. Purisync’s 24/7 emergency repair service exists for these scenarios: no-heat calls during the October–April heating season, no-cool calls during the May–September cooling season, gas smell calls year-round, and water damage events affecting HVAC equipment. After-hours dispatch is handled personally by James, not by an answering service that takes a message for callback the next business day. This page documents how our emergency response works, typical response times during peak demand, and the most common emergency repairs.
What Qualifies as an HVAC Emergency
Not every after-hours service call is an emergency, and we differentiate scope to provide the right response for the right situation:
Genuine Emergencies (Immediate Dispatch)
- No-heat during heating season — particularly when outdoor temperatures are below 32°F, when the home includes vulnerable occupants (elderly, infants, health conditions affected by cold), or when pipes are at freeze risk
- No-cool during heat advisory conditions — particularly during NWS-issued heat advisories or excessive heat warnings, when the home includes vulnerable occupants, or during multi-day heat wave events
- Active gas smell — suspected gas leak requires immediate response. Call Spire Missouri at 800-887-4173 and 911 first if leak is severe enough to evacuate the home.
- CO alarm activation — evacuate, call 911, then call us for post-incident equipment diagnostic
- Water damage from HVAC equipment — condensate overflow, refrigerant line freeze and thaw, evaporator coil sweating outside drain pan
- Active equipment damage — smoking equipment, burning electrical smell, audible bearing failure, refrigerant odor
Urgent But Not Emergency (Next-Business-Day Priority)
- Marginal heating performance (running but not maintaining setpoint during mild weather)
- Marginal cooling performance
- Unusual noise without immediate safety concern
- Thermostat issues during moderate weather
- One zone not heating/cooling in multi-zone systems
Routine Service (Standard Scheduling)
- Tune-up scheduling
- Filter replacement
- Preventive component replacement
- Equipment upgrade quotes
- IAQ consultation
Customers calling at 11 PM with routine issues receive courteous explanation that scheduling is handled during business hours, with same-day or next-day scheduling for non-emergency situations.
Typical Response Times
Peak Demand Conditions
- Polar Vortex events (January 2019, February 2021, December 2022) when overnight lows drop below 0°F: 2–4 hour response for confirmed emergencies, with vulnerable occupants prioritized
- Heat dome conditions when 100°F+ days drive substantial AC failure rate: 2–4 hour response standard
- Major weather events (severe storms, lightning surge events affecting multiple homes): response stretches based on call volume, with safety calls (gas smell, CO, water damage) prioritized over no-heat/no-cool
Typical Conditions
- Confirmed emergencies during normal weather: 1–2 hour response
- After-hours diagnostic visits for non-emergency issues: typically scheduled for next business day; emergency dispatch only for confirmed emergency scope
Vulnerable Occupant Priority
Vulnerable occupants receive priority dispatch regardless of equipment specifics:
- Elderly residents (typically 70+, particularly those living alone or with limited mobility)
- Infants under 12 months
- Residents with medical conditions affected by temperature extremes (cardiac, respiratory, neurological)
- Residents on supplemental oxygen requiring power and temperature stability
- Pregnant residents in third trimester
If you have vulnerable occupants and HVAC is not working during severe weather, mention this when calling. We adjust dispatch priority to get a technician to your home before non-vulnerable households experiencing the same equipment failure.
Most Common Emergency Repairs
Hot Surface Igniter Failure (No-Heat)
The most common heating-season no-heat call in Kirkwood, especially during early cold snap weather in November and December. Hot surface igniters have a finite operating cycle life; failures cluster around 5–8 years of service life depending on duty cycle. Symptoms: inducer motor starts, no ignition, system cycles through 3 trial ignitions then locks out. We carry universal hot surface igniters (Norton 271N, White-Rodgers 767A-374, etc.) and OEM-specific igniters for major brands on every emergency truck. Same-visit repair typical; equipment back in service within 30–60 minutes of arrival.
Flame Sensor Failure (Furnace Short-Cycling)
Flame sensor accumulates oxidation over heating seasons; cleaning typically restores function. When cleaning doesn’t restore function, replacement is required. Symptoms: burner ignites then shuts off within 5–10 seconds, system retries 2–3 times then locks out. Cleaning often works as immediate field service; replacement parts carried on truck for cleaning-resistant failures.
Capacitor Failure (No-Cool or No-Heat)
The most common cooling-season failure. Dual-run capacitors (compressor + condenser fan motor) fail with age and heat stress. Symptoms: outdoor unit hums but doesn’t start, intermittent operation, condenser fan not turning. We carry common capacitor values (35/5, 40/5, 45/5, 50/5, 55/5, 60/5, 70/5 microfarad in 370V and 440V) on emergency trucks. Same-visit repair typical; equipment back in service within 15–30 minutes of arrival.
Pressure Switch Failure (Furnace Lockout)
Pressure switches verify induced draft is established before allowing burner ignition. Failed pressure switches prevent ignition entirely. Symptoms: inducer motor runs but no ignition attempt, error code indicating pressure switch fault. Replacement parts carried for major brands.
Contactor Failure (No-Cool)
Contactors carry the 220V load to the compressor and condenser fan. Pitted, welded, or failed contactors prevent outdoor unit operation. Symptoms: thermostat calls for cooling, indoor blower runs, outdoor unit silent. Replacement parts carried.
Thermostat Failure
Battery-powered thermostats with dead batteries fail to make calls. Wired thermostat failures (failed display, failed call relays) prevent equipment operation despite otherwise functional HVAC. Common universal replacement thermostats carried on emergency trucks.
Condensate Overflow (Water Damage)
Clogged condensate drains cause water overflow from evaporator drain pan, potentially damaging ceilings, walls, and floors below the air handler. Clearing the drain, replacing damaged safety switches, and verifying drain pan integrity are emergency-scope work.
Diagnostic and Pricing
- After-hours emergency diagnostic visit: $129. Includes travel, troubleshooting, and written diagnostic findings. Applied as credit toward same-visit repair if customer authorizes repair scope.
- Common same-visit repair pricing: hot surface igniter $240–$380; flame sensor $189–$240; capacitor $189–$340; pressure switch $240–$420; contactor $240–$380; thermostat $189–$340; condensate drain clear $189–$280
- Diagnostic-only visits with deferred repair: $129 diagnostic; repair quoted for separate scheduling if customer prefers
- Maintenance plan members: priority dispatch and 15–20% repair discount; diagnostic visit included in plan benefits
- Holiday surcharge: Thanksgiving, Christmas, New Year’s Day add $80 surcharge to diagnostic visit; other holidays standard pricing
What to Do While Waiting for Service
No-Heat Situations
- Verify thermostat is set to “heat” mode (sounds obvious; we get the call frequently when AC was accidentally switched on)
- Check thermostat batteries if battery-powered
- Check breaker for furnace circuit; reset once if tripped (don’t repeatedly reset)
- Check filter; severely clogged filter can cause limit-switch lockout
- If safe to access, check that gas service is on at the meter and at the equipment shutoff
- For vulnerable occupants, move to a safer-temperature room (south-facing room with windows for solar gain; basement for thermal mass; etc.)
- Drip plumbing fixtures connected to outside walls to prevent freeze damage
No-Cool Situations
- Verify thermostat is set to “cool” mode
- Check thermostat batteries
- Check breaker for AC and air handler circuits
- Check filter (severely clogged filter can cause AC coil freeze-up)
- Check that outdoor disconnect switch is on
- If outdoor unit coil is frozen, shut off the unit and run blower only to thaw (typically 4–6 hours for complete thaw)
- For vulnerable occupants during heat advisories, move to coolest accessible room; use fans to enhance evaporative cooling
Gas Smell Situations
- Don’t ignite anything — no light switches, no appliances, no lighters or matches
- Evacuate to fresh air outside the home
- Call Spire Missouri at 800-887-4173 from outside the home
- Call 911 for severe smell
- Don’t re-enter until utility or first responders verify safe gas levels
- Call us after the immediate emergency is resolved for equipment diagnostic and repair
Frequently Asked Questions
- What’s the after-hours emergency response time in Kirkwood?
- Typical conditions: 1-2 hour response for confirmed emergencies. Peak demand conditions like Polar Vortex events (January 2019 -6°F, February 2021 -10°F, December 2022 -8°F) and heat dome conditions with 100°F+ days: 2-4 hour response. Major weather events with multi-home failures: response stretches based on call volume with safety calls (gas smell, CO alarm, water damage) prioritized. Vulnerable occupants — elderly residents, infants, residents with health conditions affected by temperature extremes, residents on supplemental oxygen, third-trimester pregnant residents — receive priority dispatch regardless of equipment specifics. Mention vulnerable occupants when calling so we adjust dispatch priority appropriately.
- What does an emergency repair cost in Kirkwood?
- After-hours emergency diagnostic visit runs $129, including travel, troubleshooting, and written diagnostic findings. The diagnostic fee is applied as credit toward same-visit repair if customer authorizes repair scope. Common repair pricing: hot surface igniter $240-$380; flame sensor $189-$240; capacitor $189-$340; pressure switch $240-$420; contactor $240-$380; thermostat $189-$340; condensate drain clear $189-$280. Maintenance plan members receive priority dispatch, 15-20% repair discount, and diagnostic visit included in plan benefits. Holiday surcharge: Thanksgiving, Christmas, New Year’s Day add $80 to diagnostic visit; other holidays use standard pricing.
- What’s the most common emergency repair?
- Depends on season. Heating-season (October-April): hot surface igniter failure is the most common no-heat call, especially during early cold snap weather in November and December. Igniters have a finite operating cycle life with failures clustering around 5-8 years of service depending on duty cycle. Same-visit repair is typical; equipment back in service within 30-60 minutes of arrival. Cooling-season (May-September): capacitor failure is the most common no-cool call. Dual-run capacitors (compressor + condenser fan motor) fail with age and heat stress. Same-visit repair typical; equipment back in service within 15-30 minutes of arrival. We carry universal and OEM-specific replacement parts for these common failures on every emergency truck.
- What should I do while waiting for emergency service?
- For no-heat: verify thermostat set to heat mode, check thermostat batteries, check breaker for furnace circuit (reset once if tripped, don’t repeatedly reset), check filter (severely clogged filters cause limit-switch lockout), check gas service is on. For vulnerable occupants, move to safer-temperature room (south-facing room with solar gain, basement for thermal mass) and drip plumbing fixtures on outside walls to prevent freeze damage. For no-cool: verify thermostat set to cool mode, check breaker for AC and air handler, check filter (clogged filters cause AC coil freeze-up), check outdoor disconnect switch is on. If outdoor coil is frozen, shut off the unit and run blower only to thaw (4-6 hours for complete thaw). For vulnerable occupants during heat advisories, move to coolest accessible room and use fans for evaporative cooling. For gas smell: don’t ignite anything, evacuate, call Spire Missouri at 800-887-4173 and 911 from outside.
- Do you charge more for nights, weekends, and holidays?
- After-hours emergency diagnostic is $129 — same pricing for weekday evenings, weekends, and standard holidays. The diagnostic fee is applied as credit toward same-visit repair if customer authorizes repair scope. Major holidays (Thanksgiving, Christmas Day, New Year’s Day) add an $80 surcharge to the diagnostic visit; repair pricing remains standard. Other holidays (Memorial Day, Independence Day, Labor Day) use standard pricing. Maintenance plan members receive priority dispatch and the diagnostic visit included in plan benefits, plus 15-20% discount on repair work performed during emergency visits. The pricing model is intentionally simple — no surge pricing for severe weather events, no holiday markup beyond the three major holidays noted above.
Contact Purisync Heating and Air
For emergency HVAC repair, contact our 24/7 emergency line at (314) 338-5111. After-hours dispatch is handled personally by James, not by an answering service that takes a message for callback the next business day. If you have vulnerable occupants in the home, mention this when calling so we adjust dispatch priority.
- Emergency Line (24/7): (314) 338-5111
- Address: 325 N Kirkwood Rd #245, Kirkwood, MO 63122
- Email: info@purisyncheatingairconditioning.xyz
- St. Louis County Mechanical Contractor License: #MC-2014-08439-STL
- Kirkwood Business Registration: #BL-2014-1187
- EPA Section 608 Universal: #608U-2014-385721
Office Hours
- Emergency Service: 24 hours a day, 7 days a week
- Office Staff: Monday – Saturday, 9:00 AM – 5:00 PM
- Closed: Sundays and State/Federal Holidays (emergency line always active)