A furnace problem can be a safety problem
Unlike a dead AC, a furnace failure sometimes points to something more serious than “no heat” — a cracked heat exchanger, a failing gas valve, or a carbon monoxide risk. We don’t just get your heat back on; we check that the whole system is actually safe to run.
Priority dispatch
No-heat calls jump the queue ahead of routine maintenance. Most calls get a tech out same-day, especially during a cold snap.
Carbon monoxide safety check
Every furnace call includes a CO and gas safety check — not an upsell, a standard part of diagnosing why a gas furnace stopped working.
Real diagnostics, not a guess
Ignitor, gas valve, blower motor, thermostat, or electrical — we find the actual cause on video before quoting a repair.
While you’re waiting for the tech
Check the basics first
Confirm the thermostat is set to heat with a reasonable target temperature, and check your breaker panel and furnace’s own switch — often mistaken for off when it’s just tripped.
If you smell gas, act first, call second
If you smell gas anywhere near the furnace, leave the house, call your gas utility’s emergency line, and then call us. Don’t wait on a diagnostic call if there’s a real gas smell.
We diagnose on-site, on video
A licensed technician checks ignition, gas valve, blower, and CO safety, and shows you the actual problem before quoting a repair — flat-rate pricing in writing.
What Fresno homeowners say about emergency service
4.8 stars across 1,200+ verified Google reviews — Fresno, Clovis, Madera, Sanger, Selma, and surrounding Fresno County cities.
Tony and his partner did an incredible job and completed the work in a timely manner. They found an issue created by another company that could’ve set my home on fire.
Three companies gave me quotes without even looking at the system. Grandmark ran a diagnostic and found the real issue. Saved me over $2,000 and my system has been perfect ever since.
Furnace died on the coldest night of the year. Grandmark came out same day, checked everything including the gas safety, and had it fixed within a couple hours.
We’ll respond in 20 minutes or less
Tell us your furnace is down and we’ll prioritize your call. During business hours, that’s typically within 20 minutes; outside business hours, first thing the next business day.
No-heat emergency FAQ
How fast can you get here if my furnace is completely down?
No-heat calls get priority dispatch ahead of routine maintenance. Most calls are handled same-day, especially during a cold snap. Call and describe your symptoms so we bring the right parts on the first visit.
What usually causes a furnace to stop working?
Common causes include a failed ignitor, a faulty gas valve, a tripped breaker or blown fuse, a dirty flame sensor, or a failed blower motor. We diagnose the actual cause on-site rather than guessing over the phone.
Is a furnace problem ever a safety issue, not just a comfort issue?
Yes. A cracked heat exchanger or malfunctioning gas valve can create a carbon monoxide risk. If you smell gas, hear unusual sounds, or your CO detector goes off, treat it as urgent — leave the house if you smell gas, and call your gas utility’s emergency line before calling us.
What does emergency furnace repair cost?
Our $89 diagnostic visit is credited in full toward your repair. Typical repair costs run $180-$650 depending on the part and complexity, with a flat-rate quote in writing before any work begins.
Do you check for carbon monoxide during a furnace repair?
Yes — a CO and gas safety check is a standard part of every furnace diagnostic, not an upsell. We want to know the system is actually safe to run, not just that the heat turns back on.
More ways we help Fresno homeowners
Fresno HVAC Hub →
Every HVAC service we offer, all in one place.
Furnace Repair →
Not a total system failure? See our standard furnace repair process and pricing.
No-Cool Emergency →
AC completely down instead? See our summer emergency dispatch details.
Furnace completely down? Call now.
Priority dispatch for no-heat emergencies. $89 diagnostic, credited to repair. Fix it right, or you don’t pay.
Grandmark Air Conditioning — Fresno, CA office
Licensed HVAC crews dispatched daily across Fresno County and surrounding cities.
(559) 245-1485 · CSLB #1030917