A furnace blowing cold air is one of the most common complaints we get from homeowners. Sometimes the fix is as simple as an incorrect thermostat setting and other times it’s a symptom of a bigger problem that requires expert repair.
Thermostat Setting: It’s best to start with the easiest solution when trying to fix a furnace blowing cold air. While it may seem obvious, it’s easy for a thermostat to be mistakenly set to “ON” instead of “AUTO,” which could result in cool air blowing throughout the house. Set your thermostat to “AUTO” and the furnace will only blow air when it’s actually producing heat.
Clogged Air Filter: One of the reasons it’s important to regularly change the furnace filter is to prevent it from becoming clogged, as a dirty filter can cause the system to overheat. As a safety measure, an overheated furnace stops producing heat and only distributes cool air from the system. Make sure to check and change the filter if the furnace is blowing cold air.
Leaky Ducts: Warm air from your furnace can escape through ductwork via leaks and cracks that haven’t been properly sealed. This can cause a furnace to blow cold air and could also increase heating bills as a result of reduced energy efficiency.
The best way to keep a heating system properly operating is to have a licensed heating technician perform a thorough furnace inspection. Preventative furnace maintenance can help catch any problems early and furnace repair by an experienced technician can help keep the home comfortable all season long.
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Harding Heating & Air Conditioning is a family-owned and operated company that has been providing furnace installation and maintenance services in the Ottawa region since 1994.