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furnace blows cold air

This can be caused by something as simple as a strong draft. 6. It’s a chilly problem that no one should have to deal with during winter in the Atlanta area! Well, if your furnace is blowing cold air, it’s most likely due to one of these problems: Yeah, that’s a lot of possibilities. First – make it worse. 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. This can cause your furnace to lock down for safety. So, how do you know which problem is causing your furnace to blow cool air? Well, lucky for you, that’s where we come in. Without the cooler air of your home flowing through it and keeping the temperature steady, it will continue to burn hotter and hotter, reaching a temperature of 180-200 degrees. Your fan limit switch is located just under your furnace hood and is in charge of telling your furnace blower when to come on. Have a technician inspect your air ducts for leaks and provide the best solution. IAQ and Mold in NYC Buildings: Are Kids at Risk. If so, someone may have been too hot yesterday, and switched the thermostat fan setting from AUTO to ON. Ensure that your thermostat is set higher than the temperature in your home. This usually arises if you haven’t changed your air filter routinely. Do you have thermostat wars going on in your office? Your furnace is a controlled fire burning inside your home. COVID-19 & Your HVAC System: Your Questions Answered. To help cool the heat exchanger down, the blower motor will continue to run, which will eventually cause the furnace to blow cold air for a short amount of time. If leaks are excessive, you may want to consider sealing your ducts. Have an expert inspect your ducts along with the furnace. Have a technician inspect your air ducts for leaks, Have a professional inspect the fan limit switch, Your thermostat settings need to be adjusted, Your fan limit switch settings need to be adjusted, Your thermostat fan button is positioned under ON or set to COOL, Your thermostat is still set to COOL not HEAT, Your thermostat fan setting is set to ON not AUTO, Your heating and cooling systems struggle to reach your desired temperature, You have higher-than-normal utility bills, Certain rooms or areas are stuffy or don’t cool/heat properly, You see ductwork with kinks, holes or loose connections, The air coming from your vents is first chilly, eventually turns warm but then gets chilly again before the fan cuts off completely between heating cycles. Have your system professionally cleaned to take care of this problem. Large holes and leaks in air ducts can make it seem like your furnace … All Rights Reserved. Furnace blows cold air: This article describes what to check if the warm air heating blower fan delivers intermittent cold air into the occupied space, or if the furnace cycles between blowing warm air & cool or even cold air into the building.. If your fan only runs when your furnace is heating the air, then you’re much less likely to experience your furnace blowing cold air. Furnaces use an indoor fan to push hot air through your air ducts and into your home. If your issue continues, call our team in Tacoma, WA. When the filter is clogged, ignition can be affected and the result is your heating not blowing hot air. 13 Common Causes. Luckily, it’s usually very easy to fix, and problems can also be prevented with … If the furnace is on, but the system continues to blow cold air, this is not normal, and there is a problem with the system. Furnace Blowing Cold Air? The fan setting on your thermostat has two options, “on” and “auto”. This can cause the air to … Common Ignition Problems. This is similar to rebooting your computer to fix a software glitch. If you haven’t done that yet this winter, call in an HVAC service expert to keep your system in top shape and prevent unexpected failures. 3. Why Is My Furnace Blowing Cold Air? Just contact us and we’ll send over an experienced Phoenix tech that can get your furnace working properly in no time. 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. When a Furnace Blows Cold Air: Troubleshooting Your Heater It’s time to re-explore an issue that we get called about a lot during this time of the year—a furnace that’s blowing cold air. Now let’s talk about an even more common reason a furnace might blow cold air: you’re using the wrong fan settings. Even if your furnace is fairly new, things can go wrong that cause this unpleasant surprise. Learn more from our free guide: HVAC Preventative Maintenance Contracts: How to Find the Right One for Your HVAC Infrastructure. Many of the causes of furnace problems can be prevented with regularly-scheduled cleaning and maintenance. Page top photo: Watch out: a return air inlet close to a gas heating furnace may be unsafe - see UNSAFE DUCT OPENINGS for details. 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. Two-stage furnaces are popular in colder areas like Montana because they have a different set of programming and valve positions that help keep your home warmer throughout the year. If not, call a professional. The lukewarm air coming out of your furnace can also be the result of leaky air ducts. This too can cause your heater to blow cold air. Source. Simply put, the furnace inside the equipment needs to get heated up for the fan to emit warm air. If this doesn’t fix your problem, and your furnace is still not blowing hot air, you can move on to some of the other potential culprits. So, once a heating cycle ends and the furnace burners cut off, the fan continues to blow. Try changing the batteries. Need a tech ASAP? This extra pressure puts strain on the furnace blower, slowing it down. Have you installed a new thermostat lately? Incorrect thermostat setting. Or, if your system has not been cleaned in a while, a valve could be stuck due to dirt and debris. That may be a quick and easy fix. Just contact us. The last thing you want to find is that the furnace is not heating. This could happen from a gust of air caused by someone working near the furnace. Check the furnace’s air filter. Pilot Light. If your furnace is overheating, that means your heat exchanger is getting too hot. The furnace says it’s a thermostat issue. If you do manage to relight the pilot but it keeps going out, a faulty thermocouple is likely causing your furnace to blow cold air. © 2021 Patrick Riley, LLC. Common reasons your furnace is blowing cold air (and what to do about it) The pilot light is out A pilot light is pretty common in older furnaces. If your furnace is blowing cold air, check your thermostat, air filter and ductwork. In some cases, you may be able to fix the problem yourself. If the filter becomes clogged, the unit can start to overheat and cause the burner to shut down. When the fan is on, the furnace will continue to blow, regardless of whether or not the air is being heated. Change the setting back to AUTO, and you’ll have heat again. You see, a clogged filter restricts the amount of cool air that runs through your furnace’s system and causes the unit to quickly overheat and shut off. And when this happens, your fan limit switch (the switch we discussed above) will shut off the burners and keep the fan on until the heat exchanger cools down. Even worse, the furnace is blowing cold air! 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. If you have a newer furnace with an electronic ignition, such as an intermittent pilot or a hot surface ignition, your system may need adjustments or replacement of failed parts. 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. When overheating, your furnace can trip a high limit switch, causing the furnace burners to shut off so that the heat exchanger does not crack. If the leaks aren’t excessive, a professional may opt to repair single leaks. We’ll explain each of the problems above, how you’ll know if that’s your particular issue and what you can do to fix it. A dirty air filter can block airflow over your furnace’s heat exchanger, which can cause it to overheat. This “hot then cold air” sequence happens over and over and your home isn’t warming up. When this happens, your … We use cookies to give you the best possible experience on our website. There are several possible causes for a furnace blowing cold air, so it’s hard to give you advice without more information. Your furnace’s limit switch, which specifically works as a safety measure, has turned your furnace burners off until the unit reaches a safe temperature. If so, someone may have been too... 2. If so, your blower may keep circulating cold air even after the burners fail to light and produce heat. Go to your thermostat. It is usual for cold air to enter the heating system until it is warm, and then for warm air to continue to blow after the air heats up. If you have an oil-fired furnace, you may be out of fuel. This is sometimes easily solved by resetting the system. Unfortunately, you’ll need a professional to fix this problem. Have your system cleaned and checked by an HVAC professional. When a furnace blows cold air, there may be an issue with the unit’s electronic control panel. If your forced-air gas furnace is blowing cold air, a number of factors could be to blame—many of which you can address on your own, without the immediate help of a service professional. Is your furnace blowing cold air? When the chilly weather finally arrives, and you have to turn on your furnace for the first time after many months of non-use, the last thing you want to find is that it’s not working. Meanwhile, you’ll get cold air because the fan continues to run as a safety measure, even after the furnace isn’t producing heat. Basically, the furnace isn’t lighting the fuel, meaning it can’t heat your home, either. If not, the compromised air flow can cause your furnace to overheat, shutting down the burner. Try turning the furnace off via the power switch. 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. So here’s the situation: It’s a chilly night in Phoenix and you turn the heat on, expecting some warm relief. But, if the switch is bad, they’ll need to replace it. We’ll send over a Phoenix professional to get your furnace back to normal operation. If you’ve had the thermostat for a while, the battery might be low. So you’ve turned on your furnace, but it’s giving you the cold shoulder by blowing cold air. If the pilot won’t light at all, you may have a faulty gas valve. Why Is My Furnace Blowing Cold Air? HVAC Preventative Maintenance Contracts: How to Find the Right One for Your HVAC Infrastructure. If you’re still not getting warm air from your furnace, we can help. But if you close too many, it increases pressure inside the duct system. Your gas supply could be turned off. If yes, our team in Conway, SC, suggest checking a few things first and then call us for help. 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. If you don’t know what a pilot light is, it’s a small flame that runs at all times in order to light the burners in your furnace. Do you have thermostat wars going on in your office? Wait a few minutes, then restart. If you did it yourself instead of calling a professional, you may have chosen a thermostat that’s not compatible with your heating system. Have you changed your air filter lately? Thermostat: A Furnace Blowing Cold Air Could be Due to Your Thermostat. Or the gas line isn’t supplying enough gas to your furnace. Inadequate gas supply. If this is the case, you can simply switch the setting from "on" … This means the fan will run continuously without providing heat. 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 gas supply is interrupted for any reason, the gas furnace pilot light will go out. Furnace back to AUTO take care of this problem requires a visit from an professional. One should have to deal with during winter in the Atlanta area can solve.. New York City area, we can help or electronic ignition, which may require a technician to single. To dirt and debris to push hot air on your thermostat, or a blinking light. That your thermostat Right one for your needs and your fan is set to AUTO lukewarm! 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