Leave immediately. From a safe place outside, call 911. For a suspected gas leak, also contact your gas utility from outside. Wait for emergency responders to authorize re-entry. Read heating safety guidance.
First, separate danger from a comfort problem
If there is no sign of an emergency, a loss of heat still deserves prompt attention—especially in freezing weather or when someone in the home is vulnerable to cold. If the home cannot remain safely warm, arrange a safe warm place to stay while seeking qualified help.
Gather observations, not a diagnosis
- Note whether all rooms or only one area has lost heat.
- Read the thermostat’s normal display and note any message.
- Record when the change began and whether it is intermittent.
- Share the equipment type if known; a description is enough if you are unsure.
- Leave panels, wiring, fuel connections, and safety controls to the professional.
Choose the closest situation
| What you notice | Where to learn next |
|---|---|
| Air comes through vents but the home stays cold | Furnace assessment or heat pump assessment |
| Radiators or hot-water baseboards stay cold | Boiler and hydronic heating |
| Only some rooms lose comfort | Uneven-heating guide |
| The system acts differently after a control change | Thermostat compatibility |
What to ask a provider
Ask about actual availability, diagnostic charges, and experience with your equipment. Before approving a repair, request a clear explanation of the fault and the proposed correction. This website has no dispatch service and cannot provide emergency assistance.
Further reading
General educational guidance. A qualified professional must assess the actual home and equipment.