Is your furnace only blowing lukewarm air rather than hot air? This will make the air only lukewarm (or cold). The reasoning here is simple: furnaces don’t pump out hot air nonstop. Replace or clean dirty or clogged filters. Is there an issue with the gas company? This means that rather than just blowing air over heating elements, the clean air must be kept separate, typically by piping it through the heat created by the combustion process. If your home’s air ducts are leaking, cold air could be making its way inside and mixing with the hot air produced by the furnace. The fix: Nothing. I have ho clue where the hot air disappears. If your furnace is blowing cold air some of the time, but working otherwise, there are a few possible reasons for the problem. However, the fan will keep running, cooling the furnace to protect it from potential damage. One of the most frustrating issues you can face in your home is finding yourself with a furnace blowing cold air. It works fine otherwise, but since day one I noticed that it blows longer than old one use to work, and always blows lukewarm air. Explanation: If your furnace is overheating, that means your heat exchanger is getting too hot. It's also possible that the furnace's pilot light isn't well shielded. But it could also be a thermocouple or flame sensor problem (see below). In such cases, a safety control device known as the limit switch will shut off the burners. Try replacing your furnace air filter and see if this improves air flow. But, of course, there are many other possible causes. If your ducts are leaking (and ENERGY STAR says that almost all homes leak about 30% of the air in their ducts), cold outside air is making its way into your ductwork. When the air temperature reaches the setting you’ve chosen — let’s say 70 degrees — the furnace can take a break until the air drops below 70 again. If your furnace is blowing cold air, or is not operating at all, a component called the fan limit switch may have malfunctioned. You expect to receive a steady supply of warm air from your vents whenever the furnace turns on. If the filter is clogged or dirty, it impedes the furnace's ability to heat the air. Or is your heater an electric heat pump? Your System Was Just Turned On. You can check this by cranking your thermostat up a few more degrees to see if the air gets warmer. If the switch is in the ON position, then the blower keeps running, even when the furnace is not heating. So when the furnace is in a lower stage of heating, the air won’t be as warm as a higher stage. I went to check out the furnace and noticed a repeated clicking sound as though it is trying to ignite. We can help you with all of your heating repair needs in Hartford, CT, including furnace and boiler services. Do you actually have a gas furnace? |. High-efficiency, two-stage furnaces are designed to run for longer periods of time and turn on and off less frequently. That may be a quick and easy fix. As long as the thermostat is reaching the temperature you set it at, it’s working fine. Reasons Why Your Furnace May Not Be Blowing Air. And make sure it’s installed correctly. Getting home to a cold house and having a furnace that blows cold air is a headache. A dirty air filter blocks airflow over the furnace’s heat exchanger, causing it to overheat. Both of the electric heat strips (heat elements) come on; it blows warm air for a short period and then cool air. More cool air than warm. Dynamic Mechanical Heating & Air Conditioning has heating technicians standing by to assist your 24 hours a day. If you have a washable air filter (which I wouldn’t recommend), then ensure that … Electric furnaces pull air through a filter before it heats it. Historic Preservation of Old Bristol Houses, Radiant Heat Installation and Replacement, Air Conditioning Installation and Replacement, Water Heater Installation and Replacement, Commercial HVAC Installation and Replacement, Dynamic Mechanical Plumbing Heating & Air Conditioning. This can make the air coming out of the vents seem lukewarm. During a cold winter, your home’s furnace will become the most vital appliance you have. This “hot then cold air” sequence happens over and over and your home isn’t warming up. Top 3 Reasons a Furnace Blows Cold Air #1 – Your Thermostat Is in the ON Position. Heating technicians, like those at Dynamic Mechanical Heating & Air Conditioning, can safely find what’s wrong with your Hartford, CT furnace and provide you with the correct repairs that will get your house warm once again. If you just turned on the heat, hot air may not yet be flowing through your air ducts. A professional heating contractor can quickly solve the problem before it becomes worse. Serving Hartford and New Haven Counties since 2006. Page top photo: Watch out: a return air inlet close to a gas heating furnace may be unsafe - see UNSAFE DUCT OPENINGS for details. Below 40 degrees, your heat pump struggles to heat your home. Your furnace blows hot air but that air quickly turns cold then the furnace shuts off altogether. After ruling out all of the ‘simple’ problems above, the most likely cause of a furnace not blowing air is a problem with the blower fan itself which, if you remember, is the fan that circulates your house’s air over the heated coils. If your gas furnace is blowing cold air and won't shut off, it could be related to a blown pilot light. Who Wrote the First Valentine’s Day Poem? With so many complex mechanisms involved in a heating system, any given number of issues could cause the furnace to malfunction. Contact a professional heating company. Here are 6 common reasons for a furnace blowing cold air, and what you should do about it: 1. Even if you can still stay “passably” comfortable from the lukewarm air coming from your furnace, you should never let a repair issue go without professional attention. 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. 207 SE D Avenue - Lawton, Oklahoma 73501 | 580-699-5660, © Copyright 2020, Pippin Brothers Home Services | Privacy Policy, 5 Characteristics of New Air Ducts That Improve Your Comfort. Replacing a Broken Hot Surface Ignitor Luckily, swapping out a … What to do if your heat pump is blowing cold air There are a few reasons your heat pump could be blowing cold air. Sign up for our newsletter to receive seasonal updates, news and tips. So it relies on an auxiliary (AUX) heat coil (like the ones you see in a toaster) or a furnace to heat your home. These are the most common reasons a furnace will blow lukewarm air. This is normal for heat pumps. 11. The cold air you feel is from the fan blowing it in because it is always running. in a 1991 or … 3 Potential Reasons Your Furnace Is Blowing Out Lukewarm Air Posted on 26 August 2016 Has your furnace suddenly become inefficient to the point that all you can receive is lukewarm air regardless of the thermostat setting? When the furnace is turned on after a certain period, whether it be days, weeks or months, turning on the system does not mean that warm air will automatically begin to pass through the vents. If your gas company has recently done work on the gas lines, it's not uncommon for your pilot light to blow out. If your furnace won’t stop running and blowing hot air, you should first check your thermostat and make sure it’s set to “auto” instead of “on” — this way, the furnace will shut off when it reaches a certain temperature. You expect to receive a steady supply of warm air from your vents whenever the furnace turns on. 1. Learn more about how to tell if you have leaky ducts and how to fix them. The fix: Duct … This is normal. Check Your Furnace Blower Fan. Once you’ve restored the correct setting, your furnace should blow warm air. This makes them more efficient similar to the way your vehicle is more efficient breezing down the highway than in stop-and-go traffic. If you notice warm air only hitting one of your rooms, check the vents nearby for holes and patch up any you see. Change the air filter. Furnace Not Blowing Hot Air – Problems & Solutions The reason your furnace is not blowing hot air could be a setting on the thermostat, a circuit breaker, or a clogged air filter. Your thermostat has an ON and AUTO switch that runs your blower. There are, incidentally, some common causes for why your furnace may be blowing cold air instead of warm, and what you can do to fix the problem. There are a few potential reasons for the sudden downgrade in your unit's heating ability. Go to your furnace and watch it when it turns on. Was it turned off for any reason? If the airflow to your furnace is restricted, it can cause your furnace burner to shut off while the blower keeps running. Therefore, if it’s below 40 outside and the auxiliary heat isn’t working, then your heat pump will just blow lukewarm or cool air. 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. It is usual for cold air to enter the heating system until it is warm, and then for warm air … 10 Common Reasons Why Your Furnace is Blowing a Cold Air Read More » Heat pumps typically produce air that is about 90-100°F, whereas furnaces can produce air as high as 120-125°F. Cold air trapped inside will need to be expelled before the hot air can take its place! You may also see an error message on your thermostat, or a blinking LED light on the furnace control board. So it continues to run and run, resulting in excess wear and tear on the heating system that will probably shorten its productive life, as well as keeping your whole home too chilly. The lukewarm air coming out of your furnace can also be the result of leaky air ducts. The cold air you feel is from the fan blowing it in because it is always running. )Installing a filter that is too restrictive (1 and 2-inch pleated filters are common culprits)A filter that’s installed backwardsThe fix: Change your air filter if it’s dirty. The blower motor itself does not create the heat; rather it blows the heated air created by the furnace through the system's ductwork. If the burners ignite and heat, the problem isn’t the gas supply. To fix this issue is simple, just flip the fan switch from “ ON ” to “ AUTO.” Auto setting will tell the furnace only to blow warm into your home when the furnace is on. Is your furnace not blowing hot air? It is entirely possible for the furnace to be burning away, producing hot air, without enough of that warm air ever actually being distributed through your home. Tuesday, February 18th, 2014 at 10:06 am | Categories: Heating © 2013–2020 Dynamic Mechanical Plumbing Heating & Air Conditioning. Gas burns fine with typical noise, chimney pipe EXTREMELY HOT, but supply duct almost cold right after furnace. If your heater still won’t stop … Again, you can watch your furnace to see if it ignites correctly. Check your gas supply. Eight times out of ten, if your furnace is powering up, and everything else seems to be normal — except that it’s blowing cold air (well, unheated air) instead of hot air, you probably just need to replace your ignitor. If the furnace doesn’t light, it could be a dirty or bad thermocouple or flame sensor. But if your furnace comes on and the air coming from the ventilation system is only lukewarm, resulting in insufficient heating for your house, you should call for professional repairs right away. If your ducts are leaking (and ENERGY STAR says that almost all homes leak about 30% of the air in their ducts), cold outside air is making its way into your ductwork. The fix: Nothing. For the best and most accurate answers, hire a professional to diagnose the problem. The problem could soon cause a complete breakdown or even a safety hazard. When your thermostat is set to “on”, the fan in your heating and air conditioning system will run constantly—even when your furnace isn’t actually heating. This can cause the air to feel only lukewarm. The most common reason why the air feels warm rather than hot deals with a hole in the air vents that carry the air out of the furnace. Tags: Furnace, Hartford, Heating 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.. New heat pump owners often notice that the air coming out of the vents isn’t as warm as when they had a gas furnace. Your furnace may be blowing cold air because the filter is too dirty. The fix: Contact a professional to figure out the problem and fix it. To fix this issue is simple, just flip the fan switch from “ ON ” to “ AUTO.” Auto setting will tell the furnace only to blow warm into your home when the furnace is on. Dynamic Mechanical Plumbing Heating & Air Conditioning Blog. Have an expert inspect your ducts along with the furnace. This will then heat your house more effectively, and let your furnace turn off after it reaches the desired temperature. You may need to call in a professional if there’s a gas issue inside the furnace itself. All rights reserved. Do not attempt to diagnose and troubleshoot the problem for yourself, especially if you have gas-powered furnace. Electric furnace putting out barely-warm air instead of hot air. The fix: Duct sealing. Warm air is sent through your ducts when the thermostat says it’s needed. The lukewarm air coming out of your furnace can also be the result of leaky air ducts. As soon as the furnace cycles back on the air will warm up again. Duct leaks can be caused by deteriorating seals, improper installation, and damage from pests. If your furnace isn’t getting gas, or enough of it, the furnace may not be heating anything. But if your furnace comes on and the air coming from the ventilation system is only lukewarm, resulting in insufficient heating for your house, you should call for professional repairs right away. Furnace Blowing Lukewarm Air Hi, I noticed that it was a little cold in the house so I put my hand by the vent and the air blowing is lukewarm at best. The furnace turns … Check if your thermostat is set to ON instead of AUTO. The fix: Make sure the gas valve to your home is turned on. If you’re experiencing lukewarm are from your ducts in addition to symptoms of duct leaks like higher than usual utility bills, call a heating and cooling exp… An electric furnace that is not blowing air could be the result of various problems. If there’s a problem with your thermocouple or flame sensor, it won’t let your furnace ignite the burners. Here are some reasons this could be happening. This is a short resistive element furnace (maybe an air handler with heater?) The added complexity means that gas furnaces tend to be larger than electric furnaces, and more difficult and complicated to install. 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