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There are several reasons why a furnace blow cold air:

1. Dirty air filter – A dirty air filter can restrict air flow, causing the furnace to blow cold air.
2. Thermostat issues – If the thermostat is not set correctly or is malfunctioning, the furnace may not receive the signal to turn on and blow warm air.
3. Ignition or pilot light issues – If the ignition or pilot light is not working, the furnace won’t ignite and produce heat.
4. Blower motor issues – If the blower motor is not functioning properly, it may blow cold air instead of warm air.
5. Gas supply issues – If there’s a problem with the gas supply, the furnace won’t receive the fuel it needs to produce heat.
6. Broken furnace parts – A malfunctioning furnace part, such as a broken heat exchanger, can cause the furnace to blow cold air.
7. Furnace blowing but no heat,furnace blowing cold air and won’t shut off,furnace blowing cold air only at night,electric heater blowing cold air in house

It’s important to diagnose and fix the issue promptly to ensure the safe and efficient operation of your furnace. If you are unsure of how to troubleshoot the problem, it’s recommended to contact a professional HVAC technician.Four Elements Service Heating&Cooling offer repair or replacement all necessary parts in your furnace.

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