Full System Down? No Heat. No Cooling. No Airflow. We Fix It—Fast. When your entire HVAC system shuts down, it's a critical emergency, especially during extreme weather in Nassau County.
One of the most common causes includes tripped breakers, blown fuses, failed control board, loose wiring, short circuits, burned-out transformer, or faulty disconnect switches. These conditions require expert handling for safety. Electrical failures can affect multiple components simultaneously, causing complete system shutdown.
Modern furnaces shut themselves down to prevent danger. Common lockout triggers include flame sensor failure, ignition system malfunction, gas supply interruption, blocked flue/exhaust, overheating limit switch triggered, frozen or clogged condensate drain, or defective pressure switch. If a furnace enters lockout mode, it won't restart until the underlying danger is fixed.
Cooling failures often involve compressor failure, refrigerant leaks, frozen evaporator coils, failed capacitor or contactor, damaged blower motor, burned-out fan motor, control board issues, or clogged condensate line triggering float switch shutoff. When the compressor or major electrical component fails, the entire unit shuts down.
Boiler emergencies can cause a full heat outage. Common causes include low water pressure, failed circulator pump, ignition/thermocouple failure, airlock in the system, damaged expansion tank, frozen hydronic lines, or pressure relief valve activation. A boiler shutdown is always an urgent situation.
Your HVAC system may shut down automatically when it detects water in the safety pan, clogged condensate line, frozen or ruptured pipes, flooding in the mechanical room, or failed condensate pump. This prevents electrical hazards and equipment damage.
When your thermostat fails, the entire system becomes non-functional. Issues include blown thermostat fuse, wiring failure, corrupt smart thermostat software, dead batteries, or incorrect control signals to HVAC system. We diagnose both thermostat and equipment side failures.
Ice anywhere in the system will cause a total shutdown: frozen coils, frozen mini-split outdoor unit, frozen refrigerant lines, or frozen condensate line. If ice is causing the failure, you need a professional thaw protocol—DIY thawing can destroy your compressor.
Emergency Service Fee
Save $50 on any after-hours emergency HVAC service call. Available 24/7 across Nassau County.
Comfort Plan — First Year
Just $7.99/mo billed annually for Year 1 (save $204 vs $24.99/mo). Includes waived diagnostic, 10% off repairs, and an annual tune-up.
First Repair Service
New customers save $100 on any HVAC repair. Diagnostic is $199, credited toward the repair.
When your entire HVAC system shuts down—no heat, no cooling, no airflow, no thermostat response—it's more than an inconvenience. It's a critical emergency, especially during extreme weather in Nassau County. A complete system failure can be caused by electrical issues, furnace lockouts, boiler problems, refrigerant system failures, frozen lines, safety shutoffs, or major component breakdowns. These are issues that cannot wait. Our 24/7 Complete HVAC System Failure Emergency Service provides 90-minute response guarantee, no overtime or after-hours fees, fully stocked trucks for on-the-spot repairs, and licensed and insured technicians. A complete HVAC system failure means your entire heating or cooling system stops functioning, including no heat, no cooling, no airflow, system won't turn on, thermostat unresponsive, furnace/AC continually shuts off, system keeps tripping breakers, boiler not producing heat, heat pump completely non-functional, full system lockout due to safety shutdown, water leaks plus system shutdown, or burning/electrical/gas-smell shutoff events. This is an immediate emergency because system failures often happen due to serious mechanical, electrical, or safety-related problems. For other emergency situations, we also provide emergency heating repair and emergency AC repair services. If you detect a gas smell or your carbon monoxide alarm is beeping, this could indicate a dangerous CO leak—call us immediately for emergency carbon monoxide service. Don't wait—call us immediately.
From call to comfort in 6 easy steps
We immediately inspect for gas leaks, carbon monoxide risks, water damage, electrical hazards, overheating components, and blocked vents/flue issues. Your family's safety is the priority. We ensure your home is safe before proceeding with diagnostics.
We evaluate furnace, AC, boiler, heat pump, thermostat, electrical supply, refrigerant system, air handlers and blowers, and outdoor unit operation. This is a full top-to-bottom diagnostic of the entire HVAC system to identify all failure points.
We isolate the exact reason for failure: electrical, control board, motor failure, safety lockout, gas supply issue, refrigerant failure, ignition malfunction, blower motor burnout, pipe freeze, or pump failure. By pinpointing the root cause, we fix the problem in one visit whenever possible.
Our trucks carry capacitors, contactors, igniters, blower motors, thermostats, flame sensors, control boards, refrigerant, fuses, transformers, safety switches, and common boiler parts. Most complete failures can be fixed in under 2 hours using parts from our stocked trucks.
After repair, we reset the system, perform safety tests, verify ignition and combustion, restore airflow, inspect refrigerant pressure, confirm thermostat control, and test heating/cooling performance. We do not leave until your system is fully functioning and safe.
After the emergency is resolved, we may recommend surge protector installation, maintenance plan, thermostat upgrade, condensate line improvements, electrical corrections, or freeze protection. This ensures your system doesn't fail again.
We guarantee arrival within 90 minutes anywhere in Nassau County, 24/7/365. For complete system failures, every minute counts, especially during extreme weather. We respond immediately.
Our technicians are fully licensed, insured, and certified with full HVAC + heating + cooling + boiler expertise. We can diagnose and repair complex multi-system failures that require broad expertise.
Same fair rate day or night, weekends and holidays. Complete system failures don't wait for convenient times—we don't charge extra for responding when you need us most.
Our service trucks carry extensive parts inventory: capacitors, contactors, igniters, blower motors, thermostats, flame sensors, control boards, refrigerant, fuses, transformers, and more. Most failures fixed in under 2 hours.
We're experts in all HVAC systems—furnaces, boilers, heat pumps, ACs, mini-splits, and hydronic systems. We can diagnose and repair any type of complete system failure.
You know the cost before we start work. We provide transparent, upfront estimates with no fees. Your emergency shouldn't come with surprises.
No fees. No surprises. Just honest service.
Most failures we repair same-visit
For serious failures requiring major component replacement
Emergency diagnostic fee ($199) is credited toward repair. Final pricing depends on the specific failures and components requiring repair or replacement. We provide exact quotes before starting work. Same rate 24/7—no overtime fees. Financing available for major repairs.
Don't let budget concerns delay your comfort. We offer flexible financing options through Synchrony Bank to make upgrading your system affordable with low monthly payments.
Starting at $24.99/month — 2 annual tune-ups, 10% off all services, and priority scheduling.
Business+ plans start at $499/year — includes 2 rtu tune-ups, 10% off all services, and priority scheduling.
Real reviews from real homeowners in Nassau County
Selected from 52+ verified Google reviews
"Our entire HVAC system went down during a heat wave. Both AC and heating were completely dead. They diagnosed a power surge that damaged multiple components, repaired everything, and had both systems working within 4 hours. Excellent emergency service!"
"Lightning strike took out our entire HVAC system. They came out immediately, diagnosed all the damage, and restored both heating and cooling the same day. Provided temporary cooling while repairs were made. Outstanding service!"
"Our system completely failed in the middle of winter. They arrived quickly, identified multiple component failures, and restored heating within hours. The technician was thorough and explained everything clearly. Very satisfied."
"Both our heating and cooling systems failed simultaneously. They diagnosed the root cause, repaired all components, and had everything working perfectly. Their comprehensive approach saved us from needing a complete replacement."
Factory-trained technicians for all major HVAC manufacturers









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Expert complete system failure in every neighborhood — click your city for local details
Get answers to common questions about our services
Turn it off at the thermostat and breaker, and call us immediately. Don't attempt to restart a completely dead system—this can indicate serious electrical, gas, or safety issues that require professional diagnosis. We'll arrive within 90 minutes to assess and repair.
Yes. When your thermostat fails, the entire system becomes non-functional. Issues include blown thermostat fuse, wiring failure, corrupt smart thermostat software, dead batteries, or incorrect control signals to HVAC system. We diagnose both thermostat and equipment side failures.
This is almost always an electrical or compressor-related emergency. Tripped breakers can indicate short circuits, burned-out motors, compressor failure, or electrical overload. These require immediate professional attention to prevent further damage or safety hazards.
We offer same-day replacement options if needed. If your system cannot be economically repaired, we can often install a replacement system quickly. We help you choose the right system for your home and provide financing options.
We strongly recommend against DIY electrical repairs. Blown fuses often indicate underlying electrical problems that need professional diagnosis. Attempting DIY repairs can cause further damage or create safety hazards.
Yes—furnaces, boilers, heat pumps, ACs, and mini-splits of every brand. We service all major HVAC manufacturers and can diagnose and repair any complete system failure regardless of brand.
Most complete failures can be fixed in under 2 hours using parts from our stocked trucks. For complex failures requiring major component replacement, we work quickly to restore basic function first, then complete comprehensive repairs.
Common causes include electrical or power failure (tripped breakers, blown fuses, failed control board), furnace safety lockout, air conditioner/heat pump system failure, boiler system failure, water damage-related shutoff, thermostat or control failure, or frozen system/ice blockage. We diagnose and address all causes.
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A full system breakdown can quickly become dangerous or cause expensive damage. Call now and we'll arrive within 90 minutes. Fast. Reliable. Professional.
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