13 Common Causes. The furnace says it’s a thermostat issue. It’s common for a furnace to blow cold air when you turn it on for the first time each season, but it can also happen at any time if something goes wrong. Wait a few minutes, then restart. If the furnace still blows cold air, call in a professional. If gas supply is interrupted for any reason, the gas furnace pilot light will go out. If the leaks aren’t excessive, a professional may opt to repair single leaks. If the furnace is cold, it cannot heat the air being propelled outside. Have you changed your air filter lately? If you have a gas furnace, a lack of fuel will cause the pilot light to go out. This is of course a very unsettling problem and not one that you want to face. That cold air mixes with the warm air from your furnace, causing the air coming from your vents to feel considerably cooler than it should. Have an expert inspect your ducts along with the furnace. If your furnace is blowing cold air, we’re sorry! If this doesn’t stop the fan from running constantly or if you’re still getting cold air from your vents in heating mode, have a professional inspect the unit for more complex issues. If the furnace burner itself is neglected, accumulated dust and grime can cause trouble igniting. If this is the case, you can simply switch the setting from "on" … First – make it worse. If yes, our team in Conway, SC, suggest checking a few things first and then call us for help. Inadequate gas supply. Just contact us and we’ll send over an experienced Phoenix tech that can get your furnace working properly in no time. So, if you have a tripped breaker, the furnace may stay on however, the air can’t warm up because the gas burner can’t ignite. Try changing the batteries. Well, lucky for you, that’s where we come in. This could happen from a gust of air caused by someone working near the furnace. HVAC Preventative Maintenance Contracts: How to Find the Right One for Your HVAC Infrastructure. No matter how you travel to work, whether it’s by bus, car or train, your commute probably ends with a cold walk in the icy wind. If your furnace fan is set to ON, the fan runs continuously, whether or not your furnace is producing heat. Furnaces can overheat for a variety of reasons, including: Two thermostat issues that could cause your furnace to blow cold air include: Yeah, we know the first one seems like a pretty silly problem but you’d be surprised by how many residents in Phoenix leave their thermostat set to COOL year round and just forget about their HEAT button altogether. We use cookies to give you the best possible experience on our website. Or the gas line isn’t supplying enough gas to your furnace. When a furnace blows cold air, there may be an issue with the unit’s electronic control panel. It’s a chilly problem that no one should have to deal with during winter in the Atlanta area! When a heating cycle begins and your air handler turns on, that cool air will blow out of your registers before warm air does. See our response to recent issues regarding COVID-19. Afraid it’s too expensive? If you did it yourself instead of calling a professional, you may have chosen a thermostat that’s not compatible with your heating system. What Can I Do If My Heater Is Blowing Cold Air? If your ducts have cracks or worse, then the cold air blowing into your house might be coming straight from outside right into your ducts, mixed in with the warm air your perfectly functional furnace is producing. Heat Pump Troubleshooting: 3 Common Problems and Solutions, The Rewards of Giving Back: Arista Team Rebuilds a Home in Puerto Rico, Commercial Refrigeration Service & Repair. Even worse, the furnace is blowing cold air! So, how do you know which problem is causing your furnace to blow cool air? But that fan has two modes of operation: ON and AUTO. If your furnace is blowing cold air, not blowing any air at all, or making odd noises, it’s important to schedule a repair as soon as possible. But you need to know when to call in the furnace repair pros so you don’t have to spend unnecessary time in the cold and interrupt your business. Many of the causes of furnace problems can be prevented with regularly-scheduled cleaning and maintenance. This is usually a simple fix, but you’ll need to call a technician to adjust or replace it. When the fan is on, the furnace will continue to blow, regardless of whether or not the air is being heated. Turn off power to the furnace at its ON/OFF switch. If you know how, you can clean or replace the filter yourself, but it’s messy and not as easy as an air filter so you may want to leave this job to the pros. Is your furnace blowing cold air? Why Is My Furnace Blowing Cold Air? 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