Thermostat
Set to heat, a few degrees above room temperature. Replace batteries if the display is blank.
No heat or heating system not working?
No heat in cold weather is urgent for people and for the building: pipes can freeze. Check the thermostat, breaker and filter, never heat with an oven or grill, then call 833-877-1717. RepairNowUSA connects the request. An independent HVAC technician does the repair.
Am I in the right place?Yes if a furnace, heat pump, boiler or electric heat is not heating, or the building is getting cold.
Is this urgent?Yes in freezing weather, when vulnerable people are inside, or when pipes could freeze. A gas smell or carbon monoxide alarm is a 911 call.
What do I do next?Do the quick checks below, then call 833-877-1717 with the ZIP code, the indoor temperature and the type of heat.
Gas furnace: see furnace repair. Heat pump: heat pump not heating. Pilot light or ignition: furnace ignition.
RepairNowUSA editorial review · Last substantively reviewed October 13, 2026 · Review standards
Quick checks
Power
Check the furnace or air-handler breaker and the service switch near the unit, which looks like a light switch. Reset a tripped breaker once.
Filter and vents
A clogged filter can make a furnace overheat and shut itself off. Replace it if dirty.
While you wait: close doors to unused rooms, use blankets and layers, and open cabinet doors under sinks on outside walls so pipes stay warmer.
Carbon monoxide and unsafe heating
Never use an oven, gas range, grill, camp stove or generator to heat indoors. They produce carbon monoxide, which can kill. Use only space heaters made for indoor use, keep them at least 3 feet from anything that can burn, and plug them straight into the wall. If a CO alarm sounds or you smell gas, get everyone outside and call 911.
Why heat stops
Furnace will not ignite
Pilot out, failed igniter or flame sensor. See furnace ignition repair.
Heat pump blowing cold air
Stuck in defrost, low refrigerant or a reversing valve problem. See heat pump not heating.
Blower runs, no heat
Burners not lighting or a safety switch has tripped.
Thermostat or control failure
A blank or unresponsive thermostat. See thermostat repair.
What to have ready when you call
- Property ZIP code, home or business
- Type of heat: gas furnace, heat pump, boiler or electric
- Indoor temperature and who is inside
- What the system does: nothing, fan only, starts then stops
- Any gas smell, CO alarm or error lights
- Whether pipes may be at risk
What happens when you call RepairNowUSA
- Describe what is happening in plain words and give the property ZIP code. You do not need to know which trade to ask for.
- RepairNowUSA checks for a participating independent provider who handles heating repair in that area.
- If one is available, you are connected. The provider confirms timing, access, scope and price with you before any work.
- The provider, not RepairNowUSA, diagnoses and performs the repair.
RepairNowUSA is a referral and connection service. Provider availability and response times vary by location, time and demand, and are not guaranteed. Before you approve work, ask what was found, the price, the timing and what is not included.
Call 833-877-1717No heat questions
Is no heat an emergency?
It is urgent in freezing weather, when infants, older adults or medically vulnerable people are inside, or when pipes could freeze. If anyone is unsafe from the cold, go to a warm place or call 911.
Is it safe to heat the house with the oven or a grill?
No. Never use an oven, gas range, grill or generator to heat indoors. They can produce deadly carbon monoxide.
Can a house without heat cause frozen pipes?
Yes. In freezing weather, pipes in exterior walls, crawl spaces and attics can freeze and burst. Opening cabinet doors and letting faucets drip slightly can help until heat is back.
Can I call for heating repair at night?
Yes. You can call 833-877-1717 at any time, including nights, weekends and holidays. Whether an independent provider can come out right away depends on your ZIP code, the time and provider capacity, so availability is not guaranteed.
Why did my heat stop working suddenly?
Common causes are a tripped breaker or switch, a clogged filter, a failed igniter or flame sensor, or a thermostat problem. A technician finds the cause.
Do providers work on all furnace and heat pump brands?
Independent HVAC providers commonly work on major brands such as Carrier, Trane, Lennox, Rheem, Goodman, Bryant and York. Tell RepairNowUSA the brand on the call. RepairNowUSA is not affiliated with or authorized by any manufacturer, and warranty work may need the manufacturer’s own network.
Authoritative references
These public sources give general safety context. They do not replace an on-site evaluation, and RepairNowUSA does not perform the work.