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Heating & Cooling Guide

Heating Not Working? Safe First Checks

When the heat does not come on, start with thermostat settings and visible system conditions while avoiding gas, combustion, and electrical components.

General homeowner guidance•Updated Sep 3, 2026
HVAC technician checking a residential heating system that is not producing heatHeating & Cooling
Overview

No-heat problems can involve thermostat settings, power, airflow, ignition or combustion components, heat-pump operation, controls, or equipment faults. Homeowners can check basic settings and filters, but fuel-burning equipment and internal electrical components require extra caution.

Start here

What You Can Check

These are basic observations or simple checks. If anything feels unsafe or uncertain, stop and seek appropriate professional help.

  • Confirm the thermostat is set to Heat and above the current room temperature.
  • Check whether the thermostat display is on and replace batteries if your model uses them.
  • Inspect the air filter and replace it if it is visibly dirty or due for replacement.
  • Make sure supply and return vents are open and not blocked.
Pay attention

Warning Signs

  • Smell of natural gas or a suspected gas leak.
  • A carbon-monoxide alarm sounds or anyone has symptoms consistent with possible carbon-monoxide exposure.
  • Burning or electrical odor, sparks, or repeated breaker trips.
  • The system makes loud mechanical noises or shows visible scorching.
Next step

When Professional Help May Make Sense

If normal thermostat and airflow checks do not restore heat, a qualified HVAC professional should inspect the system. For a suspected gas leak, leave immediately and contact the gas utility or emergency service from outside. Treat a carbon-monoxide alarm as an urgent safety issue.

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If this issue needs professional attention, use the matching Heating & Cooling connection below.

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Be prepared

What to Have Ready Before You Call

  • Heating system type if known.
  • Thermostat setting and indoor temperature.
  • Whether the blower starts or any error light/code is visible.
  • Any unusual odor, sound, alarm, outage, or recent service.
This content provides general homeowner guidance and is not a diagnosis of a specific home problem. For urgent, dangerous, or uncertain situations, contact an appropriate qualified professional or emergency service.