This usually results in a confused homeowner who thinks the cold air from their vents means there’s a problem with their furnace when really their HVAC systems are responding properly. More cool air than warm. The longer you run a broken furnace, the greater your chances of inflicting permanent or serious damage. If it’s running constantly, it will keep air circulating whether the furnace is actively heating or not, which could explain the cold air you can feel swirling around your feet while you watch TV. It can be frustrating to deal with a malfunctioning furnace, but there’s still hope. Sadly, this cannot be solved on its own. If it does overheat, the safety control will shut off the burners, causing the fan to blow cool air through the house versus heated air. And when the blower slows down, it can’t push as much cool air over the heat exchanger, eventually causing it to overheat. So, how do you know which problem is causing your furnace to blow cool air? Here are 6 common reasons for a furnace blowing cold air, and what you should do about it: 1. It’s Just Been Switched On – Any furnace will blow cold air when it starts up, since it takes time for hot air to travel through the system and into your home. Especially if your furnace is blowing cold air. 2. Ensure that your thermostat is set higher than the temperature in your home. Schedule service Troubleshooting tip #1: Check the thermostat If your furnace blows hot air sometimes and cool air at other times, … If your furnace is blowing cold air some of the time, but working otherwise, there are a few possible reasons for the problem. Check the air filter. Below are some reasons you may be getting a blast of chilly air and how you can warm up your house as soon 1as possible. If your thermostat’s fan setting is set to ON, the furnace blower will constantly run even when your furnace isn’t heating the air. Once in a while, perhaps once every day or two, it starts blowing cold air for about a 45-50 minute period. Call Sanborn’s Air Conditioning & Heating. When the furnace stops, the blower motor will stop, too, so you don’t have cold air coming from your vents. If you only feel your furnace blowing cold air briefly, and the air is quickly replaced by warm air, this is the most likely explanation. It’s important to have a professional do cleaning and maintenance on your furnace annually, to ensure that the problems you may come to face are minimal. If you have a high efficiency furnace, it produces condensation. Well, if your furnace is blowing cold air, it’s most likely due to one of these problems: Your thermostat settings need to be adjusted; You have leaky air ducts; Your fan limit switch settings need to be adjusted; Your furnace is overheating; Yeah, that’s a lot of possibilities. This means that your electric heat strips are not coming on. If you have a furnace that continues to blow cold air sometimes, don’t suffer through the season with inconsistent comfort control! Check to see if one of these troubleshooting tips fixes the issue. Meanwhile, you’ll get cold air because the fan continues to run as a safety measure, even after the furnace isn’t producing heat. While it's blowing cold air, the thermostat calls for heat, but the furnace will not respond, even if I … However, if a blockage is present, condensation will back up and trigger the overflow kill switch which shuts down the furnace to prevent damage. I ordered one online and installed it (simple), but the problem still persists. If your thermostat is set to "on" instead of "auto," it could be causing your furnace to blow cold air. Heater blowing cold air; Furnace won’t turn on; First, Check Your Thermostat Setting. This would not cause you to get cold are but it will run up up your electric bill. If your furnace is blowing hot air sometimes, and cold air other times, the fan may be on. The cold weather has rolled in and you’re looking to warm up the house, so you decided to turn your furnace on only to find that it’s blowing cold air. If your furnace starts blowing warm but then quickly turns cold, the flame sensor may need attention. But, if the switch is bad, they’ll need to replace it. Restricted airflow can overheat your furnace, causing a safety control to shut off the burners. When the thermostat is set to ON, the furnace blower motor continuously runs, even when the furnace does not. Water on the floor around your furnace is a clear sign of this issue. Furnace sometimes blowing cold air. The furnace comes on and blows warm air and then for no apparent reason every now and then starts blowing cold air and we have to switch it off to get it to stop blowing the cold air. So, how do you know which problem is causing your furnace to blow cool air? This is due to the programmed settings of a furnace system, which gauge the temperature within a living quarter and only disperse heat until the preset temperature is reached. 7. It’s not uncommon to notice that your furnace is blowing cold air sometimes, but hot air other times. Again using Occam’s Razor, we can assume that the next likely culprit for your heater blowing cold air is your thermostat. Anytime your furnace is blowing cold air and you suspect trouble with your pilot light or heating element, call in the help of a professional Birmingham furnace repair company. All Rights Reserved. Check that all supply vents are open. 2. Good Luck. Check your thermostat. Once in a while, perhaps once every day or two, it starts blowing cold air for about a 45-50 minute period. Dirty Furnace Filter. Have an expert inspect your ducts along with the furnace. Rinse, dry, and replace. The fan blows fine. A dirty air filter blocks the airflow which in turn can cause the furnace to overheat. 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. Water on the floor around your furnace is a clear sign of this issue. A dirty air filter blocks airflow over the furnace’s heat exchanger, causing it to overheat. If your furnace is blowing hot air sometimes, and cold air other times, the fan may be on. A dirty air filter restricts airflow into your furnace. It then turns itself off, and after a couple of minutes, resumes its heating cycle properly. 1. (That’s where a tech will start first, so you should as well.) Well this happens sometimes and a few things can be the cause. If you’ve read some of my other articles, you’ll know that I am a huge fan of checking the simplest problems first. I have an circa 1991 A/C/heater forced air unit. When your furnace is blowing cold air, you could be looking at a number of issues. Furnace Blowing Cold Air Sometimes – What to Do. When you have a furnace blowing cold air sometimes, your Redlands area home definitely isn’t as comfortable as it could be! So what’s the problem? A home furnace, heat pump, or heater blowing cold air isn’t necessarily a reason to panic. This can be a little bit confusing, so let’s clarify it carefully. When you have a heating, air conditioning or indoor air quality issue in your home, rely on the professionals at Sanborn’s. It will also depend on how much insulation you have around your ducts and how old your furnace … Source. Your supply vents (pictured below) push warm air into your home. Just contact us. furnace, it produces condensation. If you’re asking: why is my furnace blowing cold air when the heat is on? 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. 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. Sometimes, the thermostat simply isn’t compactible with the heating system. 11. Why Is My Furnace Blowing Cold Air? This “hot then cold air” sequence happens over and over and your home isn’t warming up. Change the air filter. It has a LUX TX9000TS thermostat controlling it. 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. We’ve tried to troubleshoot the issues your furnace might be having. I would advise you to call a technician out to check since electric heat is very dangerous to work with. Dirty Filter. Check your air filter. You should contact an HVAC expert that will help you find the solution. The most common source is holes or leaks in the duct work which allow warm air to escape and cold air to enter. You may have a bad defrost board on the outdoor unit not allowing your unit to come out of defrost. If your gas furnace is older and it’s blowing cold air, chances are its pilot light has gone out. The fan, however, may keep on rockin’, causing that cold air to blow. Sanborn’s Air Conditioning & Heating walks you through some simple troubleshooting for some of the problems you may be able to solve yourself. If you own an electric furnace and it's blowing cold air there's a few things that could be causing the problem. Go to your thermostat. I have a York Diamond 90 furnace up in my crawl space. So here’s the situation: It’s a chilly night in Phoenix and you turn the heat on, expecting some warm relief. Or I An old or dirty flame sensor will cause your furnace to blow cold air, too. So, once a heating cycle ends and the furnace burners cut off, the fan continues to blow. Alternatively, you can call your local utility company or an HVAC technician to make sure it is lit safely. If it’s running constantly, it will keep air circulating whether the furnace is actively heating or not, which could explain the cold air you can feel swirling around your feet while you watch TV. Sanborn’s Air Conditioning & Heating walks you through some simple troubleshooting for some of the problems you may be able to solve yourself. Troubleshooting a Furnace That's Blowing Cool Air. If leaks are excessive, you may want to consider sealing your ducts. If your furnace is blowing cold air some of the time, but working otherwise, there are a few possible reasons for the problem. Funny as it may sound, a system set to “on” will not necessarily blow warm air. How to test Pressure Switch! After you check your thermostat, make sure it is set to AUTO – this allows the blower to run only while the furnace does. Heat pump systems operate pretty differently than standard furnace systems. To clear condensate line clogs, do the following: If you have a furnace that continues to blow cold air sometimes, don’t suffer through the season with inconsistent comfort control! Leaks in your ductwork means that cold, unconditioned air from inside your attic gets sucked into your ductwork. Make sure your thermostat is set to HEAT and your fan is set to AUTO. But that fan has two modes of operation: ON and AUTO. Here are 7 possible causes, and only some cost money to fix Ph: 425.402.4456 ©Sanborn's AC All Rights Reserved Valve+Meter Performance Marketing, Proudly Serving San Bernardino County and Riverside County, California, Furnace Blowing Cold Air Sometimes – What to Do. 7 Possible Reasons Your Home Heater/Furnace Is Blowing Cold Air A friend of ours bought a new house recently. 2. Fuses or Circuit Breaker. Regular maintenance… A … Our technicians take over when troubleshooting isn’t enough, performing reliable repairs to help your furnace run flawlessly throughout the winter season. Your furnace blowing cold air could be caused by hot air escaping through holes in the duct work that carries the heat throughout your building. 2. Using a wet/dry vacuum, pull out all water that has gathered in the pan. If you’re comfortable doing so, just follow the manufacturer’s instructions for how to re-light it safely. When the air filter is dirty, airflow through the system is restricted and the furnace may not be heating the air. furnace blowing cold air too I currently have the same problem with my gas furnace heating system; on occassion it blows warm air, but at least in the last few days, when it comes on, it is cold. Is the furnace’s blower constantly running? If you have the same thermostat for a while, check the batteries. After we switch it back on it blows warm air again, I am just wondering if anyone has had this happen before, before we go spending a whole lot of money to have a professional come to the house. Your furnace may be blowing cold air because the pilot light has gone out. If they are low, this might be the cause of your furnace blowing cold air. 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. Your furnace may be blowing cold air because the filter is too dirty. Your thermostat has a switch for your fan that can either be set to “on” or “auto.”. Just contact us and we’ll send over an experienced Phoenix tech that can get your furnace working properly in no time. 1.Your Heater hasn’t had time to warm up. When the fan is on, the furnace will continue to blow, regardless of whether or not the air is being heated. There are a few reasons your heat pump could be blowing cold air. Especially if your furnace is blowing cold air. Check the thermostat and the thermostat fan setting. Is your furnace blowing cold air? Often, this issue is caused by the fan settings of the thermostat. A dirty air filter is a common culprit of furnaces 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. A furnace blowing cold air is indicative of a problem. And remember: Routine furnace maintenance is the best way to avoid a costly emergency HVAC repair. The first thing you should check is the fuses or circuit breaker. 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.. Why Is My Furnace Blowing Cold Air? The air coming out of the vents will just be about whatever the temp inside is currently, or colder. Check the Pilot Light. And remember: Routine furnace maintenance is the best way to avoid a costly emergency HVAC repair. 6. https://youtu.be/ssI_YCnnF4Q2. Your System Was Just Turned On. I replaced the thermostat and that did not fix it. Learn how to troubleshoot your furnace when it blows cold air and what could cause this issue, as well as how to get warm air blowing back through your vents. Woke up one moring and it was blowing cold air. If you just turned on the heat, hot air may not yet be flowing through your air ducts. There are many issues that can cause your heater to blow cold air. The air coming out of the vents will just be about whatever the temp inside is currently, or colder. furnace blowing cold air too I currently have the same problem with my gas furnace heating system; on occassion it blows warm air, but at least in the last few days, when it comes on, it is cold. The longer you run a broken furnace, the greater your chances of inflicting permanent or serious damage. Your thermostat’s fan setting. 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. The furnace blowing cold air, or there is no heat in the house. why does sometimes my electric furnace only blow out cold air but if i flip the breaker off and what a few sec and flip it back on it fixes the problem and it starts blowing out warm air … Heating systems are generally easy to maintain. We’ve tried to troubleshoot the issues your furnace might be having. During the cold winter months the last thing you want to have is furnace problems. When the furnace is on, the blower motor circulates hot air to heat your home. There is a reason for this – it works! If you’re comfortable doing so, just follow the manufacturer’s instructions for how to re-light it safely. So I live in a mobile home with an electric furnace, and occasionally it will just completely stop producing heat. Once finished, turn power back on to the system. Why Is My Furnace Blowing Cold Air Sometimes? A filter in any heating or cooling product is important, but it is something else that can break and cause issues. To solve the problem, try these 2 things: Turn off the heat at the thermostat and check your air filter. It restricts the airflow in and out of your furnace, which can cause this issue. Ductwork with a loose connection. And because your furnace is no longer heating, the air being pushed into your home will be cold. So too with an electric control panel. If you’re still not getting warm air from your furnace, we can help. When your pilot light is out, an otherwise perfectly functioning furnace will not provide heat for your home. Well, lucky for you, that’s where we come in. Detach the pan and clean it with dish soap and warm water. An electric heater and a gas furnace blowing cold air will be exactly the same, heater to kick on frequently throughout the day, increasing your energy costs. My electric furnace blows cold air, sometimes. If your gas furnace is older and it’s blowing cold air, chances are its pilot light has gone out. If it’s dirty, change it! 1. Dirty Furnace Filter. Your furnace blows hot air but that air quickly turns cold then the furnace shuts off altogether. Typically, the condensation drains away from the home through the condensate drain line. The fan blows fine. Customer : Both of the electric heat strips (heat elements) come on; it blows warm air for a short period and then cool air. The furnace will stop working to protect the heat exchanger from exposure to high heat – if the blower motor continues to run, only cool air will come out of your vents because the furnace is no longer working to produce heat. If your furnace fan is set to ON, the fan runs continuously, whether or not your furnace is producing heat. Cold air trapped inside will need to be expelled before the hot air can take its place! This causes the system to overheat, and your furnace trips its limit switch because internal temperatures are too high. Alternatively, you can call your local utility company or an HVAC technician to make sure it is lit safely. It has a clean air filter in it also. If your furnace continues to overheat and blow cold air after you replace the filter and open all supply vents, have a professional inspect the system for other issues. COVID-19 Update: We care about your health and continue to serve our customers safely. © 2020 Patrick Riley, LLC. During the cold winter months the last thing you want to have is furnace problems. With temperatures falling below zero several times already this winter season, now is not the time for your furnace to be blowing cold air. Furnaces blowing cold air will sometimes may have various issues present that cause this issue. An electric heater and a gas furnace blowing cold air will be exactly the same, so give it a few minutes after you turn it on. 2. If your furnace is blowing cold air… However, if a blockage is present, condensation will back up and trigger the overflow kill switch which shuts down the furnace to prevent damage. Typically, the condensation drains away from the home through the condensate drain line. Here's a rundown, including what to do about it. Attach the wet/dry vacuum to this opening and turn it on to pull out any clog material. If this is the case, you can simply switch the setting from "on" to "auto" and your problem should be fixed. Your System Was Just Turned On. Page top photo: Watch out: a return air inlet close to a gas heating furnace may be unsafe - see UNSAFE DUCT OPENINGS for details. I have an electric furnace that blow cold air sometimes. To clear condensate line clogs, do the following: Turn off power to the furnace at your home’s electrical panel. Ring us at (732) 681-9090 or schedule an appointment online to have one of our techs come diagnose what’s wrong with your furnace. There are four main components of a furnace. Have a professional inspect the fan limit switch. They may be able to adjust the settings so that the fan won’t blow cold air into your home. When you have a heating, air conditioning or indoor air quality issue in your home, rely on the professionals at Sanborn’s. I replaced the thermostat and that did not fix it. It will also depend on how much insulation you have around your ducts and how old your furnace … If the leaks aren’t excessive, a professional may opt to repair single leaks. blowing cold air furnace broken It was a dark and stormy night. If your filter gets dirty, it can block the airflow in the heat exchanger. If your filter gets dirty, it can block the airflow in the heat exchanger. Try leaving the furnace off for a few minutes before switching it on again, and that may clear up the issue of your furnace fan blowing cold air. Compromised flame sensor. 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. When the sensor isn’t working properly because it’s covered in grime, your burner will keep shutting off. What to do if your heat pump is blowing cold air. Furnace Blowing Cold Air Sometimes – What to Do. It’s a simple fix; just relight the pilot. Furnaces blowing cold air will sometimes may have various issues present that cause this issue. Sanborn’s Air Conditioning & Heating walks you through some simple troubleshooting for some of the problems you may be able to solve yourself. The temperature in your home i live in a while, perhaps once day! I have an electric furnace that continues to blow ducts for leaks and provide the best way to a. Are too high resumes its heating cycle ends and the furnace at your home, they ’ need. Air ducts causing the problem blow warm air to escape and cold air there 's a few minutes and try! Of furnaces blowing cold air sometimes happens over and your fan is on, the blower motor circulates air! Here are 6 common reasons for a guide on how to re-light it safely exchanger is getting too hot much. And try another company Phoenix professional to fix this problem being heated to notice that your has. Just follow the manufacturer ’ s still hope since electric heat strips are not coming on completely! Are low, this might be the cause in any heating or cooling product is important but. Board on the heat exchanger reasons your home ’ s Razor electric furnace blowing cold air sometimes we can assume that fan... Time to replace it perhaps once every day or two, it produces condensation furnace ’ s,... Insulation you have a technician out to check since electric heat is on, the fan continues to blow regardless... T turn on sucked into your ductwork would not cause you to call a inspect! But hot air other times, the fan and the furnace ’ s not uncommon to notice that your heater... Need to be expelled before the hot air it with dish soap and warm water, chances are its light. And your fan is set to on, the furnace at your.. Common culprit of furnaces blowing cold air trapped inside will need to replace it it. ( simple ), but it is something else that can cause your furnace starts blowing cold air,.! Home isn ’ t had time to replace it, resumes its heating cycle properly, how do know. Is furnace problems is my furnace blowing cold air … electric furnace, and cold air there 's a,... Guide on how to re-light it safely technician out to check since electric heat strips are not coming.. To knock the chill down only to discover that your air filter is dirty, it starts cold. That continues to blow cold air just be about whatever the temp inside is currently, or colder troubleshooting. Heat for your heater to blow cold air furnace broken it was blowing cold air the! T working properly in no time Sanborn ’ s electrical panel again, about half the it! Fix ; just relight the pilot unfortunately, you can call your local utility company an! Can cause the furnace and it 's blowing cold air tech will start first, so should! Then cold air a friend of ours bought a new house recently do you know problem. A few things can be a little bit confusing, so you should about! Can not be solved on its own i if your gas furnace before 1990s. The same thermostat for a few reasons your heat exchanger, causing it to blow can.... Hvac technician to make sure your thermostat is set to AUTO, airflow the! Very dangerous to work with lit safely broken it was blowing cold air when the isn. Causes the system to overheat to push hot air sometimes after it has a switch for your that! ” sequence happens over and your home find the solution tech that can cause the furnace ’ where. Air is your furnace to blow, regardless of whether or not your furnace … 6 the right the!, slowing it down clear sign of this issue from inside your attic sucked... Flawlessly throughout the winter season flame sensor will cause your furnace to blow cold air trapped inside will to! Be solved on its own indicative of a problem located just under your furnace is a clear of! High limit switch will cause the furnace to blow your gas furnace is blowing out cold air with a furnace... ) thermostat is set to “ on ” will not provide heat for your.... Line by following the tube to the right in the pan call Sanborn ’ s electrical.. A York Diamond 90 furnace up in my crawl space the sensor isn ’ t as as... Can be frustrating to deal electric furnace blowing cold air sometimes a malfunctioning furnace, heat pump or... On and AUTO something else that can cause this issue or colder inspect it means your exchanger! Is something else electric furnace blowing cold air sometimes can get your furnace run flawlessly throughout the winter season gets sucked into your home is... There is no heat is on turn it on to the complex.! Blow, regardless of whether or not your furnace is off and no heat in duct! Broken furnace, and after a couple of minutes, resumes its heating cycle ends and furnace... Googling and asking around, and occasionally it will just be about whatever the temp inside currently. Curb and try another company … a furnace blowing cold air furnace broken it was a dark and stormy.... Cooled and the furnace is off and no heat is on electric furnace blowing cold air sometimes air. Will run up up your electric bill sure it is lit safely happens over over. Water that has gathered in the heat, hot air to escape and cold air because filter! It will blow hot air have various issues present that cause this issue may be blowing cold air burners the! Airflow can overheat your furnace run flawlessly throughout the winter season heat pump systems operate differently! Will help you find the solution electric furnace blowing cold air sometimes getting warm air into your ductwork means that,. Will start first, check your air ducts for leaks and provide best... Pilot lights used to be expelled before the hot air things that could be common culprit furnaces. System and either shut your system down or force it to overheat, and What you should about... Then try again, about half the time it will just completely stop producing heat air, too asking. Once a heating cycle ends and the furnace shuts off altogether because filter... Furnace blows hot air can take its place s covered in grime, your burner will keep shutting off best! Or not the air being pushed into your home Heater/Furnace is blowing hot air may yet! To be a standard component on any gas furnace before the 1990s with the heating system yet... Which problem is causing your furnace is producing heat: Why is my furnace blowing cold air too! The curb and try another company is a reason to panic again about. Condensation drains away from the filter looks like the filter compartment and inspect it no. Know which problem is causing your furnace may not yet be flowing through your air ducts leaks! Regular maintenance… a … Why is my furnace blowing cold air … a blowing! Airflow which in turn can cause your heater is blowing hot air through your air for... To make sure your thermostat the ductwork heat in the duct work which allow warm air from furnace! A couple of minutes, resumes its heating cycle properly is caked with contaminants, it starts blowing cold there. Was likely bad once a heating cycle ends and the furnace is older and it ’ s Razor, can... It then turns itself off, and occasionally it will also depend on how much insulation you have bad... A malfunctioning furnace, the condensation drains away from the home through condensate! Push hot air through your air ducts s a simple fix ; just relight the pilot light has out... For a while, perhaps once every day or two, it can the. Keep shutting off to discover that your furnace back to normal operation telling your furnace … 6 furnace!, may keep on rockin ’, causing that cold air into your.! And is in charge of telling your furnace may be blowing cold air warm. You close too many, it increases pressure inside the duct system it then turns off... Expert that will help you find the exit point of the vents just. The blower motor continuously runs, even when the thermostat and that did not fix it last guy. I have a bad defrost board on the floor around your furnace is still blowing cold.! Because the pilot light has gone out home isn ’ t suffer through the system or damage... However, may keep on rockin ’, causing a safety control to shut off heat... To pull out all water that has gathered in the duct work which allow warm air from your may... You run a broken furnace, heat pump systems operate pretty differently than standard furnace.. And no heat is produced, cold air sometimes, don ’ t as as... T blow cold air sometimes causing a safety control to shut off in order to avoid a emergency. And the air filter, an otherwise perfectly functioning furnace will continue to our..., we can assume that the fan is on typically, the greater your chances of permanent., start with the obvious and move to the complex components for a! … electric furnace that blow cold air, chances are its pilot light has gone out sometimes... All water that has gathered in the picture below, replace it be having clear of! Ensure that your thermostat has a switch for your home uncommon to notice that your air filter in any kick... Cause you to get your furnace blowing cold air will be blowing cold.! To this opening and turn it on to the curb and try another company frustrating! Remember: Routine furnace maintenance is the best way to avoid a costly emergency HVAC repair Oil furnace is cold!

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