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Davis & Salt Lake County

(385) 865-6749
CMB HVAC — Utah's Local HVAC

Emergency HVAC Service

Urgent HVAC Problems: Safety First, Then Fast Diagnosis

Some HVAC failures are comfort problems and some are safety events. CMB HVAC treats burning smells, gas odors, carbon-monoxide alarms, and water near electrical as safety first — then provides urgent diagnosis during our booking hours for heating and cooling failures.

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Urgent HVAC Problems: Safety First, Then Fast Diagnosis

Start here, because the order matters: gas odor, a sounding carbon-monoxide alarm, smoke or a burning smell from equipment — those are leave-the-house events. Get everyone outside, then call 911 or your gas utility from outdoors. Utility crews respond around the clock regardless of any contractor's hours, and they are the right first call every time. No repair is worth re-entering a house that's telling you it's unsafe.

For urgent failures that are comfort emergencies rather than safety events — no heat on a freezing night, no cooling in a heat wave, water spreading from the furnace or air handler — call us at (385) 865-6749 or book online. Our booking hours are Monday through Friday 8 to 5, Saturday 8 to noon, and Sunday 8 to 12:30. The diagnostic visit is free, findings are documented, and any repair is quoted flat-rate before work begins.

When You Reach CMB HVAC

  • Safety triage on the call

    If your description sounds like a safety event, we'll say so and route you to 911 or the utility — before booking anything.

  • Free diagnostic visit

    The urgent visit is our free service call — diagnosis and documented findings, with no charge to find out what's wrong.

  • Findings before invoices

    What failed, why, and what it costs to fix — explained and quoted flat-rate before any repair begins.

  • Honest scheduling

    You'll get our real availability, not a promise someone else will break at midnight.

What Kind of Emergency Is This?

Read the safety section first — the anchors below sort the rest.

  • Gas odor or CO alarm

    Leave now, call 911 or the gas utility from outside. Then us, for the repair once the house is cleared.

  • No heat in freezing weather

    A safety-system shutdown is often the cause — worth understanding before repeated resets make it worse.

  • No cooling in a heat wave

    Some no-cool calls are safety-adjacent (ice, water, electrical) — triage steps before the visit.

  • Water where water shouldn't be

    A leaking furnace or air handler near electrical is a shut-it-down situation — the protocol is quick.

What an Emergency Diagnostic Includes

  • Safety triage first: combustion, CO screening, electrical, and water checks at the equipment
  • System diagnosis with instruments — the failed component identified and explained
  • Documented findings: what failed, why, and what it means for the equipment
  • Flat-rate repair quote before any work begins — you approve, or you don't
  • Interim measures where they're safe: shutoff guidance, safe-reset instructions
  • If parts are needed: availability stated honestly, with the earliest real date
  • Carbon-monoxide screening of the whole system before it runs again
  • Follow-up documented in your service history

Booking an Urgent Visit

  1. Call or book online

    (385) 865-6749 during booking hours; the online booking page takes requests any time.

  2. Describe the symptoms

    Sounds, smells, alarms, and what the system is doing — the description routes the urgency honestly.

  3. Get the real availability

    You'll hear our actual earliest slot during booking hours — not a vague promise that evaporates.

  4. Prep the space

    Clear access to the equipment, pets secured, and the unit left off if we've advised it — the visit starts faster.

How Urgent Repairs Are Priced

Urgent doesn't mean opaque: the diagnostic is free and the repair is flat-rate before it starts.

  • The diagnostic is free

    Finding the failure costs nothing — you learn what's wrong before you owe anything.

  • Repairs are flat-rate

    The repair price is on one page — parts and labor together — before work begins. You approve it or you don't.

  • Safety repairs don't wait on upsells

    If something is unsafe to run, we say so plainly and explain the options — the choice stays yours.

The diagnostic visit is free; any repair is quoted flat-rate in writing before work begins, and the quote is what you pay. If service ever occurs outside booking hours, any different terms would be quoted and agreed before work starts — never discovered on an invoice afterward.

How an Emergency Visit Runs

  1. Triage on the phone

    Safety symptoms are routed to 911 or the utility first; comfort failures get the earliest real slot.

  2. Arrive & make safe

    The visit starts with safety: combustion, CO, electrical, and water checks before anything runs.

  3. Diagnose & quote

    The failed component found and explained; the flat-rate repair quoted in writing before work begins.

  4. Repair & verify

    Fix approved, system repaired, and the whole system re-checked — including CO screening — before it runs for you.

When Everyone's System Fails at Once

Urgent HVAC calls here cluster brutally: the first hard freeze of December and the first triple-digit week of July each generate more calls in three days than some months see total. That reality is why we'd rather give you real availability than invented promises, and why the safety triage at the top of this page matters — in a countywide cold snap, the gas utility and 911 are the only organizations answering around the clock, and knowing when to call them is part of HVAC literacy. The other local note: a working carbon-monoxide alarm and a known gas shutoff are the two cheapest emergency tools in any Utah home.

  • Know where the gas shutoff and the furnace switch are before winter
  • Test CO alarms when you set clocks — they're the alarm that matters most here
  • A free diagnostic beats a Saturday of guessing with a space heater

What Each Failure Means

Safety first — then the two seasonal emergencies, explained.

Safety Red Flags: Leave and Call

These symptoms mean the house, not the appointment: gas odor anywhere in the home; a carbon-monoxide alarm sounding; smoke or a persistent burning smell from equipment or vents; water leaking onto or near electrical components. The protocol is the same shape every time — get people out, don't operate switches or anything electrical on the way, and call 911 or the gas utility from outside. Dominion Energy's gas emergency line and 911 answer around the clock. Once the house is declared safe, the repair is ours to quote — and that diagnostic visit stays free.

No Heat in Freezing Weather

Furnaces protect themselves before they endanger you: a flame that won't prove, an overheat, a blocked vent, or a pressure problem all trigger a safety shutdown — which looks like 'no heat' but is often the system refusing an unsafe condition. Try the simple, safe checks once: thermostat set to heat and calling, furnace switch on, filter not clogged. If it restarts and dies again, leave it off — repeated resets against a real fault are how small problems become safety problems. We diagnose the shutdown reason and quote the fix flat-rate.

No Cooling in a Heat Wave

Heat-wave failures cluster around three causes: a tripped breaker or blown float switch from a clogged condensate drain, a frozen coil from restricted airflow, and capacitor or contactor failures from sustained hard running. Safe checks first: breaker once, drain line visible for standing water, filter condition. If the coil is icing, shut cooling off and run fan-only to thaw it — running a frozen coil flat out damages the compressor, which is the expensive kind of urgency. Then the visit: diagnosed with instruments, quoted before work, CO and electrical re-checked before it runs.

Preventing the Next Emergency

Most urgent calls are anniversaries: the maintenance that didn't happen two seasons ago, announcing itself during the season that tested it. A furnace tune-up before winter and an AC tune-up before summer catch the failed igniters, worn capacitors, clogged drains, and cracked belts while they're cheap appointments instead of Saturday-night ones — and the safety checks at each visit are the recurring CO and combustion screening most homes never otherwise get. It's the least dramatic possible emergency service: the emergency that doesn't happen.

Related Services & Pages

Before You Need This Page

Do you offer service after hours?
Our booking hours are Monday through Friday 8 to 5, Saturday 8 to noon, and Sunday 8 to 12:30 — that's when you reach us directly and when urgent visits are scheduled. Outside those hours, the online booking page takes requests and they're handled as the office reopens. And the honest note that matters most: for gas odor, a CO alarm, or smoke, the gas utility and 911 are the right call at any hour regardless of any contractor's availability — they answer around the clock, and that's by design.
Do you charge extra for emergency visits?
The diagnostic visit is free — that holds for urgent calls, not just routine ones. Repairs are quoted flat-rate in writing before any work begins, so the number you approve is the number you pay. If a visit ever occurs outside our normal booking hours and different terms would apply, that gets stated and agreed before work starts — never discovered on the invoice afterward. What we don't do is advertise a premium-emergency rate card; the price conversation happens before the work, every time.
My carbon monoxide alarm is going off — what do I do?
Treat it as real: get everyone out of the house immediately, including pets if you can do it in seconds, and call 911 from outside. Don't open windows first or investigate the source — ventilation changes what responders find and costs you minutes. Don't silence the alarm and stay. Fire departments and gas utility crews test the atmosphere and find the source; that's their equipment and their job. Once the house is cleared as safe, the equipment that caused it gets diagnosed and repaired — and that visit, including a full CO screening of your system, is where we come in.
My furnace keeps shutting off — is that an emergency?
Often, yes, in freezing weather — but probably not the kind people assume. Furnaces have safety limits that shut them down before conditions become dangerous: a flame that won't prove, an overheating exchanger from restricted airflow, a blocked vent. One safe restart is reasonable; a furnace that repeatedly starts and dies should be left off, because repeated resets against a real fault are how safety problems develop. In freezing weather a home can lose pipes in hours, so the visit gets scheduled with real urgency — and the diagnosis, including why each shutdown happened, is documented.
Water is leaking from my furnace — what now?
Shut the system off at the switch, and if water is anywhere near electrical components, turn the power off at the breaker — only if you can reach it safely without standing in water. High-efficiency furnaces produce condensate, so the most common culprits are a clogged drain, a failed pump, or a corroded pan; less commonly it's a humidifier or a coil issue. Then book the visit — the diagnostic is free, the source gets found and explained, and any repair is quoted before work begins. Water and equipment rarely improve with patience.
How fast can you get here?
Honestly, rather than impressively: call and you'll hear our actual earliest availability during booking hours — same-day when the schedule allows, and during cold snaps and heat waves the honest answer is sometimes next-day, for us and for everyone. What the visit gets when it arrives: safety checks first, instruments for the diagnosis, documented findings, and a flat-rate quote before any work. The fastest reliable path to a warm (or cool) house is a correct diagnosis on a scheduled visit — not a rushed guess.

Connect With Us For Your Free In-home Consultation!

Urgent Help, Safely Done

Call (385) 865-6749 or book online. Safety triage first, real availability, and the quote before any work begins.

Book Urgent ServiceCall (385) 865-6749