In most cases, it’s best to have a professional identify the problem and repair your furnace. VA Master Plumber/Gas Fitter #2710019013 • VA Class A Contractor #2701038423 • MD Master Plumber/Gas Fitter #82253 • MD Home Improvement #123872 • MD Master Electrical #3952 • MD Master HVAC #65489 • DC General Contractor #420211002808 • DC Master Electrical #EM900824 • DC Master HVAC #RC 901906 • DC Master Plumber/Gas Fitter #PGM10542 • WSSC Master Plumber/Gas Fitter #PFG 73421. Again using Occam’s Razor, we can assume that the next likely culprit for your heater blowing cold air is your thermostat. 13 reasons your furnace is blowing cold air 1. Duct leaks need to be pinpointed and repaired by a professional to resolve heat loss. Possible Conclusion 1: It’s … If your furnace seems to be blowing cold air, it could be a problem with the ignition system. You might be able to tell if your ducts have a leak, but fixing them is another issue. Unfortunately, this is not a problem you can fix on your own. 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. This causes the system to overheat, and your furnace trips its limit switch because internal temperatures are too high. Your furnace actually heats air via a part of the furnace called the heat exchanger. For Furnace … So when the furnace isn’t heating that air, it will come out the vents as lukewarm or cold. Your furnace is supposed to heat your home, so the last thing you’d expect is to feel cold air coming from your home’s air registers when your system is running. If your air filter is dirty, replace it ASAP. This time of year, especially when it gets cold outside in the evenings, we get many calls from homeowners concerned that there is cold air blowing out of the duct registers in their home when their heat is running. So 85-92°F feels cold to new heat pump owners. If the thermostat isn’t responsive, call a professional. A furnace that isn’t getting fuel will not ignite and will blow only cold air. If this is the case, we may have solved your problem. New furnaces are equipped with a spark ignitor or electronic ignition, which may require a technician to repair. Active 2 years, 7 months ago. After all, a furnace shouldn’t be blowing cold air, right? The type of ignition system in your furnace will depend on the furnace’s age and manufacturer. If your furnace overheats, it could end up blowing cold air. An overtaxed furnace will often overheat and malfunction, and end up blowing cold air. When the furnace overheats, the heat exchanger becomes abnormally hot. Is the furnace’s blower constantly running? 7. Does your blower turn on & off frequently or does it blow cold air sometimes? If your furnace is blowing cold air, or is not operating at all, a component called the fan limit switch may have malfunctioned. Privacy Policy. Gas furnace. All Rights Reserved. Thermostat: A Furnace Blowing Cold Air Could be Due to Your Thermostat. If they’re not, try changing the batteries. Cold air problems that require professional repair Overheating furnace. Clogged air filters could be causing cold air to blow out of your vents. One of the most common causes of a furnace blowing cold air is not actually a repair at all. 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. Electric resistance heating, which use heat strips (standard with every heat pump) installed in your ductwork. Older furnaces have a pilot light, while most newer furnaces have an electronic ignition system. If your heater is blowing cold air, and it’s not one of the first two possible explanations on this list, then you’ll need a specialist to at least come and take a look. Other thermostat issues. Sometimes snow, ice or other debris can clog the system and either shut your system down or force it to blow cold air. This is another reason to have your system checked regularly. When the weather turns especially cold—as has been the case this year in Sacramento and much of Northern California—we often get calls from customers reporting that their heat pump-powered heating systems are blowing cold air through the vents, no matter how high they turn the thermostat. Here are some possible reasons your furnace is blowing cold air: We’ll explain what can cause these four issues in greater detail and why it’s best for a professional to handle the repair. The hot and cold air pattern might happen for an extended period, and still, your house remains cold. When the filter is clogged, the furnace has to work overtime to distribute adequate amounts of warm air throughout your house. 1.Your Heater hasn’t had time to warm up. By switching the thermostat to “auto,” the fan will only blow when the furnace is heating the air. Cabrillo Plumbing, Heating and Cooling ©document.write(new Date().getFullYear()) | All Rights Reserved | 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. Turn your thermostat from HEAT to OFF. Your Furnace Air Filter is Dirty This type of heating is highly inefficient. After you check your thermostat, it’s time to check your air filter. A dirty air filter is a common culprit of furnaces blowing cold air. Schedule service Troubleshooting tip #1: Check the thermostat If your furnace blows hot air sometimes and cool air at other times, … 78 Dorman Ave San Francisco, CA 94124 United States Maybe the sensor that turns the fan off is not working and allows the fan to continue blowing too long. 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. After making sure your thermostat is set to HEAT, make sure the fan is set to AUTO and not ON. When set to ON, your furnace will deliver air 24/7, even in between heating cycles. However, the fan will keep running, cooling the furnace to protect it from potential damage. Your furnace can then trip a high limit switch which will, in turn, cause the furnace burners to shut off so that the heat exchangers don’t crack. People get confused, and sometimes even scared when this happens. The type of ignition system in your furnace will depend on the furnace’s age and manufacturer. How have you & your family been feeling? When you turn on a faucet to receive hot water, you often have to wait a bit... 2. Inadequate gas supply. Click here for a guide on how to fix this problem. 2. So if you’re experiencing furnace issues, give us a call. Your furnace’s fan is controlled by a limit switch which tells it when to turn on and off. Viewed 3k times 0. Sometimes a thermostat can accidentally get switched to the incorrect setting without the homeowner realizing it. But as it turns out, this is a furnace problem that comes up often in many Bay Area homes. This issue can be resolved sometimes simply by turning off your furnace and resetting the system. 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. There are two possible routes here, one of which many homeowners who are new to heat pump systems encounter. If neither your thermostat or your air filter seems to be the issue, there may be a bigger problem at hand. This can be caused by something as simple as a strong draft. A weak power source won’t trigger the sail switch, and it won’t regulate the air flow. Or, the valve could simply be worn out. If the limit switch is broken or not operating properly, the fan can turn on too soon, which can cause cool air to blow out of your vents. Terms and Conditions | Privacy Policy | Sitemap If you have leaks or holes in your air ducts, warm air can easily escape which could explain why you’re feeling cool air coming from your furnace instead of heat. 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. If... Condensate clog. Your gas supply could be turned off. Blowing Cold Air. Bay Area plumbing, heating and air conditioning contractor. Here are 6 common reasons for a furnace blowing cold air, and what you should do about it: 1. 5740 General Washington Dr Sometimes, the heat exchanger can get too hot and overheat. Cold air trapped inside will need to be expelled before the hot air can take its place! Make sure the thermostat’s screen is on and the buttons are responsive. Michael & Son Services (Corporate Headquarters) Your furnace is overheating if it blows hot air, then cold air, and turns off. Do you have thermostat wars going on in your office? A heat exchanger is a group of metal coils that are heated. Basically, the furnace isn’t lighting the fuel, meaning it can’t heat your home, either. If so, this is a sign that your furnace may need to be replaced. The Flame Sensor is Dirty. Why is my new high efficiency furnace blowing cold air sometimes? Otherwise your electric heater or gas furnace will not turn on. But first, we’ll share a couple of fixes you can try at home before you call a pro. 5 reasons why your furnace might start bowing cold air 1. While it sounds counterintuitive, an overheating furnace can actually produce cool air rather than... A faulty ignition system. If the flame sensor is dirty, your furnace will turn on and begin heating but then turn cold … Double-check that your thermostat is set to HEAT and not COOL. Do this: Try relighting the pilot light following these steps: Step 1: Turn off your furnace Reason #3: Overheated furnace. Your thermostat’s fan setting. That could explain why you feel cool air coming from your vents every once in a while. In such cases, a safety control device known as the limit switch will shut off the burners. Page top photo: Watch out: a return air inlet close to a gas heating furnace may be unsafe - see UNSAFE DUCT OPENINGS for details. Leaky air ducts can also make your furnace work harder as it strives to meet your desired temperature that’s set on your thermostat. A professional can check the limit switch to make sure it’s working correctly. This field is for validation purposes and should be left unchanged. Ensure that your thermostat is set higher than the temperature in your home. If it’s not, they can replace it. Without combustion, you won’t have heat. Your body temperature is around 98.6°F (everyone’s body temperature is slightly different, but that’s the average). A furnace technician can inspect the ignition system to find and repair any issues. It’s the beginning of a heating cycle. Our NATE-certified technicians are available for same-day emergency furnace repairs. 415-821-0560 | If you have any questions about why your furnace is blowing cold air, or if you’d like a heating system serviced or installed in your home, contact Cabrillo, your Bay Area plumbing, heating and air conditioning contractor. When your heat pump sometimes blows cold air even when the setting for heat is on, it’s an alarming problem and depending on the cause, a common enough one. Have you cranked up your thermostat to knock the chill down only to discover that your heater is blowing out cold air. While it sounds counterintuitive, an overheating furnace can actually produce cool air rather than warm air. A dirty air filter will restrict airflow to your furnace and can cause it to overheat. The problem may be the thermostat fan setting. With electronic ignition systems, cold air could be caused by an electrical issue or if parts need to be adjusted or replaced. Does your furnace blow hot air sometimes and cold air other times? Or the gas line isn’t supplying enough gas to your furnace. A dirty furnace filter is the root cause of many problems. Call a professional so they can do an inspection and identify and repair any leaks. 1 When the thermostat stops calling for heat, the furnace will turn the electric heating coils off, but allow the fan to continue blowing air until the coils cool down. A dirty air filter can block airflow over your furnace’s heat exchanger, which can cause it to overheat. When air blows over the coils, the air picks up that heat. When the air filter is dirty, airflow through the system is restricted and the furnace may not be heating the air. Dirt and debris can collect on the valve, causing it to shut down. Called a “dual-fuel system”, the gas furnace kicks on when the heat pump can no longer efficiently pull heat from the cold air outside. Once again, the low battery voltage can be the issue here, so the best thing to do is to replace the battery. If you have a gas furnace, a lack of fuel will cause the pilot light to go out. Today we’re going to talk about five reasons why your furnace might start blowing cold air in your home so that you can properly take care of the issue if it happens to you! Maintenance issues again here: if you have a gas furnace that hasn’t been cleaned in a long time, a faulty valve could be the reason for the cold air blowing out of your furnace. Ask Question Asked 6 years, 5 months ago. Two thermostat issues that could cause your furnace to blow cold air include: Your thermostat is still set to COOL not HEAT Your thermostat fan setting is set to ON not AUTO So Why Is My Furnace Blowing Cold Air Instead Of Heat? Pilotless ignition furnaces use a flame sensor to keep the furnace burning once it starts. Check The Thermostat. Another noise is when you hear the furnace blower running excessively. If you have an older furnace and your pilot light is unable to stay lit, the ignitor won’t light the burner and there will be no combustion. But, the air coming out of the vents can feel cold for a couple reasons: Gas furnaces produce air that is 130-140°F range. If your furnace is blowing cold air, give us a call today! To troubleshoot a misbehaving gas furnace, start with the easiest explanations and solutions, then work your way to the most complicated. New high efficiency furnaces have what is known as a condensate … If so, someone may have been too... 2. Leaks in the ducts allow heat energy to escape, so once heated air reaches your living areas, it doesn’t feel so warm. If a reset does not correct the issue, calling a qualified HVAC specialist to repair your panel is your next best option. You may also see an error message on your thermostat, or a blinking LED light on the furnace control board. 1) Thermostat is set to ON Is your furnace blowing cold air only sometimes? Incorrect thermostat setting. If you think this might be a mistake, feel free to contact us and we can confirm. We're sorry, but it looks like we don't offer service to this zip code. 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.. When your thermostat is set to ON, the fan will run continuously even when your furnace isn’t producing heat. Well this happens sometimes and a few things can be the cause. Design and Marketing by LeadsNearby. Most furnaces have safety features that will automatically shut off the burners when it senses the furnace is overheating. When it’s set to AUTO, the fan will only run when the furnace is actually producing heat. If your furnace starts to run properly after the filter is changed, you’ve solved the problem. Furnaces can overheat for a variety of reasons, including: If you’ve already checked your air filter and you know it’s not the source of the problem, you’ll need to contact a professional for a furnace inspection.. Alexandria, VA 22312 Map | (800) 948-6453, © Michael & Son Services Inc. 2003–2021. When it’s operating properly, the switch will turn on after the burners have completely warmed up the air and blown it across the heat exchanger, so only warm air is being blown into your home. When it’s cold outside, the last thing you want to find is cold air coming out of your furnace when it’s supposed to be heating your home. Another reason your furnace might blow cold air is if the electronic control panel is broken. Sometimes, a furnace blows cold air due to duct leaks. Call a professional identify the problem system to overheat bit... 2 device! Repair your furnace overheats, the valve could simply be worn out water... 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