(This problem depends in part on the type of thermostat, of course). Thank you very much in advance. Their improper installation thus led to the air conditioner blowing hot air. When his inspector looked at his HVAC system (a heat pump, meaning it both heats and cools the house), a few big problems immediately made themselves known. When he turned on the air conditioner, warm air came out. A dirty air filter blocks airflow over the furnace’s heat exchanger, causing it to overheat. Your System Was Just Turned On. This rendered the AC useless. So if your furnace shuts down or stops blowing cold air, you’re in a chilly situation. Though on closer inspection, the heat seemed pretty weak. If your furnace starts blowing warm but then quickly turns cold, the flame sensor may need attention. This entry was posted So if you feel the air blowing out of the vents while the furnace is off, the air … This field is for validation purposes and should be left unchanged. That was tripping on the air handler, which was supposed to be only for emergency heat. In extreme cases, low humidity can even crack wooden furniture. Why is the heater blowing cold air from the vents - YouTube You’re standing there pushing buttons trying to heat up the house, but it’s just not working. An electric heater that blows cold air could be caused by one or more of the following reasons: The manual reset has tripped. Because it illustrates just one of many reasons why a heater might blow cold air, and an air conditioner might blow hot air. If so, your heat pump is blowing warm air that just feels cold to you. You can follow any responses to this entry through the RSS 2.0 feed. Tags: AC, AC maintenance, AC repair, air conditioner maintenance, air conditioner repair, air conditioners, energy efficiency, furnace maintenance, HVAC, HVAC maintenance, HVAC repair, thermostat. Otherwise it has to work a lot harder just to pull the air, which means you’ll get less warm air coming out than you should. SOLUTION: Check if there are any breaks in the line after opening up the case. Check the fan setting on your thermostat, and if it’s set to ON, switch to AUTO. The first thing you have to do is check to see what type system you own. In older models, verify that the pilot light is lit. If energy efficiency is as important to you as heating or cooling your house, making sure you have a clean air filter is a critical troubleshooting and maintenance step. However, fixing the problem can be easier than you think. So, when the new homeowner called an HVAC specialist (not us, because he was outside our service area – click here and scroll down to see if you’re in it), he learned what was really happening. The dirty air filter will block airflow, causing the furnace to run longer to heat your home until it overheats. Why tell this story? It could be that your heater is working just fine. Most commonly, a dirty furnace air filter. Compromised flame sensor. Solution: Change the air filter and see if your furnace starts only blowing warm air. But a dead circuit board ends your furnace’s attempt to heat your house real quick. The Pilot Light Has Gone Out. Here are just a few things that could mean: Seems silly, but you’d be surprised how often this has happened. Maybe it just died of old age or malfunction. Once the heat exchanger cools down, your furnace will try again to warm your house (and will likely repeatedly turn on and off). An electric heater that blows cold air could be caused by one or more of the following reasons: The manual reset has tripped. There are many issues that can cause your heater to blow cold air. But if your heating system is only blowing cold air, it could mean one of several different things. There are many reasons an HVAC (heating, ventilation, air conditioning) system might stop working. If your heater turns on but it’s blowing cold air, turn it off and check to make sure there’s nothing obstructing the blower. When this occurs, your furnace can’t heat the air like it’s supposed to. Air Conditioning Installation & Replacement, heating repair, installation and replacement, air conditioning repair installation and replacement, Radiator Warning Signs You Shouldn’t Ignore. A friend of ours bought a new house recently. 7 Reasons Your Heater Blows Cold Air/AC Blows Hot Air. First – make it worse. During the cold winter months the last thing you want to have is furnace problems. You can hear it blowing, but no heat is coming out. When your furnace isn’t running, the air in your ducts cools down. Since the heater core is often the high point in a cooling system, air can move into it … This cycle must be completed a few times before air from the heater can successfully warm your home. If it’s dirty, change it! Have you cranked up your thermostat to knock the chill down only to discover that your heater is blowing out cold air. There are other reasons your heat pump could be blowing cold air instead of heat, but those are the basics. Your furnace may be blowing cold air because the filter is too dirty. So what causes the furnace to overheat? The wires together work as a complete circuit and in case any of them snaps from the constant heating and then cooling then the circuit may get broken and may stop giving off heat. The blower keeps blowing to cool the furnace down to a safe level. There are a few reasons your heat pump could be blowing cold air. There could be two possible causes for this: The thermostat fan is set to “ON” The fan in the furnace is responsible for blowing heated air through the vents. But the heat pump was also just very old, and repairing it would have cost nearly the same as just getting a new one, which is what they ended up doing. To troubleshoot a misbehaving gas furnace, start with the easiest explanations and solutions, then work your way to the most complicated. But all you have to work with are the symptoms. Airflow Issues: Another possible problem is the accumulation of dirt and debris inside of ductwork which can slow down airflow. They worked around a failed heat pump by making the emergency heat the main heat. When set to “on”, the fan on your furnace will blow continually, even when the furnace isn’t actually heating the air. All Rights Reserved. Click the link below, scroll down to see if you’re in our service area, and if you are, tell us what’s going on with your HVAC system. If your heater was blowing lukewarm instead of cold, a thermostat that was stuck open would have been a potential cause. Well this happens sometimes and a few things can be the cause. Again, this depends on your specific type of thermostat. The harder it has to work to pull air through the filter, the less efficient it will be. That’s what our friend’s former homeowners appear to have done. If your furnace is blowing cold air some of the time, but working otherwise, there are a few possible reasons for the problem. To protect the heater from malfunctioning altogether, engineers embed automatic limit switches that are responsible for turning the heat-generating furnace off. The heater’s blowing cold, or the AC is blowing hot. If you are unsure if your location is within our service area, please contact us to find out! If you only feel your furnace blowing cold air briefly, and the air is quickly replaced by warm air, this is … When he had a professional look into why this was happening, he learned it would be an expensive repair job on an outdated heat pump. If you just turned on the heat, hot air may not yet be flowing through your air ducts. If you find that your heater isn’t producing warm air, check the thermostat. The same issue exists during summer, only in reverse. Check your air filter. You might even try turning your circuit breaker off and back on. If you clear any debris or blockage and the problem persists, you could have a faulty heating element. If your heater is blowing warm air but that air is venting into the attic or mixing with colder air from your attic, then the net result will be that your heater is blowing cold air. And, it increased their heating costs a ton, because the air handler is a far more expensive way to heat a house than the much more efficient heat pump. If your heater is blowing warm air but that air is venting into the attic or mixing with colder air from your attic, then the result will be that your heater is blowing cold air. 1.Your Heater hasn’t had time to warm up. My furnace seems to be blowing cold air. Heating systems work by heat exchange, which means that your HVAC system returns the cold air to the outside of your house. The previous owners in our friend’s house probably realized their heat pump was failing, so they rewired the system in a convoluted way to get around the problem, rather than deal with it properly. Especially if your furnace is blowing cold air. Heat Pump Blowing Cold Air | Refrigeration Heating Troubleshooting. 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. Verify that the circuit breaker controlling the system has not tripped. Another common problem is when air gets into the cooling system. It's heating the water just fine, and is a new hot water heater. What to do: 1. But, when it's running - just occasionally, and I guess it's when it's heating the water - it creates freezing cold air. The Fan Is Off . The fan switch is “on” and the thermostat setting is below the actual temperature The fan is dispersing this air after shutdown There may be a loose wire coming from the elements The heater elem 6. This was part of the problem our friend was dealing with. Likewise for the air conditioner. Rebecca, if I were close to where you live, I would come out and take a look at your system and tell you what was wrong and repair it for you. 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. Why tell this story? Check the Pilot Light on Gas Furnaces. The fan switch is “on” and the thermostat setting is below the actual temperature; The fan is dispersing this air after shutdown; There may be a loose wire coming from the elements; The heater element may be defective If you have an older furnace, then it’s possible that the pilot light has gone out. If my closet door is open, it feels like a freezer door is open an there's a fan blowing cold air … Electric heaters require power. Situation #1: When the heater blows warm air for a while and then blows cold air. Think dry skin, chapped lips, and static electricity. 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. I have no idea what information would be helpful in figuring this out, so feel free to ask for what you need. Solution Based Plumbing & Heating. on Thursday, November 8th, 2018 at 12:26 am and is filed under AC service, Home heat service, maintenance. Call a professional for inspection and repairs. Second – test out the simple explanations. But all you have to work with are the symptoms. Hence the hot air. Check to make sure that your gas supply line valve is open. To solve the problem, try these 2 things: Turn off the heat at the thermostat and check your air filter. Your heater has to first collect and compress the air in your home, then heat it and expel the cold air. Do I Really Need to Clean My Gas Fireplace. 11. Your heat pump might be in “defrost mode” When in defrost mode, a heat pump may blast cold air from its vents for 1 or 2 minutes (before the backup heat kicks in). If your heater stops blowing after a short period or starts emitting cold air, it might be a good idea to check if the furnace is working fine. Sometimes this happens simply because your batteries have died. The heater’s blowing cold, or the AC is blowing hot. Even more strange, the previous owners had rewired the system somehow so the air handler came on every time, even for air conditioning. These simple fixes might solve the problem, saving you lots of trouble, frustration, and expense. These 5 fixes can solve most furnace problems without you needing to pay for a repairman to come out. If you need a professional and you live in our service area, we’d love to help. Electric Furnace. Meanwhile, you’ll get cold air because the fan continues to run as a safety measure, even after the furnace isn’t producing heat. When he turned on the heater, the outdoor unit didn’t seem to be working right, but the indoor unit, an air handler, came on and seemed to heat the house. 3 Reasons For Heater Blowing Cold Air In House. For a heat pump or heater to produce warm air, air must flow easily through the filter. Motors that turn the fans and make the conversion process from warm to cold (or cold to warm) work right can get old and rusty, or break down for other reasons. Check your thermostat and make sure that it is set to “auto” rather than “on.”. Maybe it got shorted out. When set to “ON” the fan … If the filter looks like the filter to the right in the picture below, replace it. Changed the air filter Changed the thermometer to the ecobee 3 (old one was a honeywell started malfunctioning) Would calling a pro be pricey? There are many reasons an HVAC (heating, ventilation, air conditioning) system might stop working. Air also carries humidity, and warm air holds more humidity than cold air. When a heating cycle begins and your air handler turns on, that cool air will blow out of your registers before warm air does. Changing the air filter can possibly fix the cold air problem, but only if that’s the only problem that is keeping the heat from blowing hot air as opposed to cold air. If you hear that irritating screeching sound when your system turns on, this could be the reason (though it’s not the only reason that happens). It’s also possible you have it on the wrong setting, such as ‘fan’ as opposed to ‘heat’. The most common type is the furnace or heat pump, which is generally connected to a ducted air system. My heater stopped blowing hot air throughout the house what could it be ? 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 that happens, your heater (or AC) will not produce the temperature of air you want it to. It may have been closed during the summer for safety reasons. That way, your blower won’t run 24/7 and thus send cold air through the vents if the room … CAUSE: Another common reason for room heater not blowing hot air is broken heater coil. The result is a heater blowing cold air. A system error in the controls of the heat pump was forcing an automatic system shutdown just seconds after it started. The last five items on the list above require a professional or a new furnace or heat pump to fix them. Heat Pump – If a heat pump is blowing cold air, its auxiliary heat strips might be malfunctioning or the level of refrigerant might be too low. Why Is My Furnace Blowing Cold Air Sometimes? Why Is My Furnace Blowing Cold Air? Make sure the thermostat is set to “AUTO”, not “ON”. The house stays at a constant 72 degrees (what it's set at), but I'm afraid that the unit may be in need of repair or replacement, or that it might be using more energy than necessary. Both comments and pings are currently closed. Not in our service area: Granite Falls, Lake Stevens, Marysville, Renton. The Heater is Too Big/Small – The heater’s size makes a difference to how well it works. Have an expert inspect your ducts along with the furnace. Check the thermostat. His heat pump was starting up and then shutting off immediately, and the emergency heat was taking over. Check the air filter. The thermostat’s fan is set to ON. Third – hire a professional. Another possible problem is the accumulation of dirt and debris inside of ductwork which can slow down airflow. 1) Change the furnace’s air filter if it’s dirty You might be able to tell if your ducts have a leak, but fixing them is another issue. I've never seen such a thing. 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. There are two different system types: forced air duct systems that push warm air with the aid of a blower into the system and vents, and gravity furnace systems that use convection currents to circulate the warm air. See if your furnace ’ s also possible you have to work pull! 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