If you just turned on the heat, hot air may not yet be flowing through your air ducts. Warm air is sent through your ducts when the thermostat says it’s needed. 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. Tuesday, February 18th, 2014 at 10:06 am | Categories: Heating Check Your Furnace Blower Fan. As long as the thermostat is reaching the temperature you set it at, it’s working fine. If your furnace is blowing cold air, or is not operating at all, a component called the fan limit switch may have malfunctioned. But it could also be a thermocouple or flame sensor problem (see below). Check if your thermostat is set to ON instead of AUTO. So it relies on an auxiliary (AUX) heat coil (like the ones you see in a toaster) or a furnace to heat your home. 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. The reasoning here is simple: furnaces don’t pump out hot air nonstop. If you have a washable air filter (which I wouldn’t recommend), then ensure that … My brand new Goodman furnace blowing lukewarm air. This can cause the air to feel only lukewarm. Page top photo: Watch out: a return air inlet close to a gas heating furnace may be unsafe - see UNSAFE DUCT OPENINGS for details. You can check this by cranking your thermostat up a few more degrees to see if the air gets warmer. Try replacing your furnace air filter and see if this improves air flow. Below 40 degrees, your heat pump struggles to heat your home. The lukewarm air coming out of your furnace can also be the result of leaky air ducts. Do not attempt to diagnose and troubleshoot the problem for yourself, especially if you have gas-powered furnace. Learn more about how to tell if you have leaky ducts and how to fix them. This can make the air coming out of the vents seem lukewarm. Heat pumps typically produce air that is about 90-100°F, whereas furnaces can produce air as high as 120-125°F. That may be a quick and easy fix. It's also possible that the furnace's pilot light isn't well shielded. All rights reserved. The fix: Nothing. And make sure it’s installed correctly. As soon as the furnace cycles back on the air will warm up again. Dynamic Mechanical Heating & Air Conditioning has heating technicians standing by to assist your 24 hours a day. Here are some reasons this could be happening. If the airflow to your furnace is restricted, it can cause your furnace burner to shut off while the blower keeps running. With so many complex mechanisms involved in a heating system, any given number of issues could cause the furnace to malfunction. 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. 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. |. Again, you can watch your furnace to see if it ignites correctly. For the best and most accurate answers, hire a professional to diagnose the problem. 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? Or is your heater an electric heat pump? Is your furnace not blowing hot air? 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 you notice warm air only hitting one of your rooms, check the vents nearby for holes and patch up any you see. Explanation: If your furnace is overheating, that means your heat exchanger is getting too hot. The furnace turns … Contact a professional heating company. 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. 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. If the filter is clogged or dirty, it impedes the furnace's ability to heat the air. The problem could soon cause a complete breakdown or even a safety hazard. 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 your furnace is blowing cold air some of the time, but working otherwise, there are a few possible reasons for the problem. This makes them more efficient similar to the way your vehicle is more efficient breezing down the highway than in stop-and-go traffic. 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. The fix: Nothing. We can help you with all of your heating repair needs in Hartford, CT, including furnace and boiler services. If the furnace doesn’t light, it could be a dirty or bad thermocouple or flame sensor. The cold air you feel is from the fan blowing it in because it is always running. 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… 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. 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. 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. This “hot then cold air” sequence happens over and over and your home isn’t warming up. If your gas company has recently done work on the gas lines, it's not uncommon for your pilot light to blow out. The blower motor itself does not create the heat; rather it blows the heated air created by the furnace through the system's ductwork. Duct leaks can be caused by deteriorating seals, improper installation, and damage from pests. 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. Top 3 Reasons a Furnace Blows Cold Air #1 – Your Thermostat Is in the ON Position. Once you’ve restored the correct setting, your furnace should blow warm air. Reasons Why Your Furnace May Not Be Blowing Air. There are a few potential reasons for the sudden downgrade in your unit's heating ability. Other potential problems include a bad blower fan or limit control switch. High-efficiency, two-stage furnaces are designed to run for longer periods of time and turn on and off less frequently. The cold air you feel is from the fan blowing it in because it is always running. Cold air trapped inside will need to be expelled before the hot air can take its place! This is a short resistive element furnace (maybe an air handler with heater?) If your heater still won’t stop … The added complexity means that gas furnaces tend to be larger than electric furnaces, and more difficult and complicated to install. An electric furnace that is not blowing air could be the result of various problems. 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. This is normal. If there’s a problem with your thermocouple or flame sensor, it won’t let your furnace ignite the burners. 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. Electric furnaces pull air through a filter before it heats it. Go to your furnace and watch it when it turns on. 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. A professional heating contractor can quickly solve the problem before it becomes worse. I went to check out the furnace and noticed a repeated clicking sound as though it is trying to ignite. Your thermostat has an ON and AUTO switch that runs your blower. 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. One of the most frustrating issues you can face in your home is finding yourself with a furnace blowing cold air. The fix: Duct … The fix: Contact a professional to figure out the problem and fix it. Is there an issue with the gas company? This results in mild, lukewarm air emerging from the vents. 1. These are the most common reasons a furnace will blow lukewarm air. However, the fan will keep running, cooling the furnace to protect it from potential damage. Your furnace may be blowing cold air because the filter is too dirty. Dirty air filters (Change it! Tags: Furnace, Hartford, Heating If the switch is in the ON position, then the blower keeps running, even when the furnace is not heating. 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 furnace overheats, it could end up blowing cold air. Dynamic Mechanical Plumbing Heating & Air Conditioning Blog. This will then heat your house more effectively, and let your furnace turn off after it reaches the desired temperature. What to do if your heat pump is blowing cold air There are a few reasons your heat pump could be blowing cold air. You may need to call in a professional if there’s a gas issue inside the furnace itself. The fix: Set your thermostat to “auto” and the fan will only run when the furnace is actually heating. Is your furnace only blowing lukewarm air rather than hot air? Electric furnace putting out barely-warm air instead of hot air. 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. 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. I have ho clue where the hot air disappears. Your furnace blows hot air but that air quickly turns cold then the furnace shuts off altogether. This will make the air only lukewarm (or cold). Both of the electric heat strips (heat elements) come on; it blows warm air for a short period and then cool air. Was it turned off for any reason? But, of course, there are many other possible causes. 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. Gas burns fine with typical noise, chimney pipe EXTREMELY HOT, but supply duct almost cold right after furnace. The lukewarm air coming out of your furnace can also be the result of leaky air ducts. The fix: Duct sealing. 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. in a 1991 or … Here are 6 common reasons for a furnace blowing cold air, and what you should do about it: 1. 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. If the burners ignite and heat, the problem isn’t the gas supply. 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 » Sign up for our newsletter to receive seasonal updates, news and tips. You expect to receive a steady supply of warm air from your vents whenever the furnace turns on. 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. © 2013–2020 Dynamic Mechanical Plumbing Heating & Air Conditioning. So when the furnace is in a lower stage of heating, the air won’t be as warm as a higher stage. You may also see an error message on your thermostat, or a blinking LED light on the furnace control board. To solve the problem, try these 2 things: Turn off the heat at … Serving Hartford and New Haven Counties since 2006. If your gas furnace is blowing cold air and won't shut off, it could be related to a blown pilot light. 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. Who Wrote the First Valentine’s Day Poem? 11. This is normal for heat pumps. You expect to receive a steady supply of warm air from your vents whenever the furnace turns on. The fix: Make sure the gas valve to your home is turned on. 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 System Was Just Turned On. 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. In such cases, a safety control device known as the limit switch will shut off the burners. Have an expert inspect your ducts along with the furnace. )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. If your furnace isn’t getting gas, or enough of it, the furnace may not be heating anything. Check your gas supply. Replacing a Broken Hot Surface Ignitor Luckily, swapping out a … During a cold winter, your home’s furnace will become the most vital appliance you have. This can cause the air to feel only lukewarm. 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. Replace or clean dirty or clogged filters. 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.. A dirty air filter blocks airflow over the furnace’s heat exchanger, causing it to overheat. Getting home to a cold house and having a furnace that blows cold air is a headache. More cool air than warm. Need more help? Do you actually have a gas furnace? Change the air filter. 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. 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. Appliance you have air could be the result of various problems 90-100°F, whereas furnaces can produce as... Such cases, a safety hazard and patch up any you see Contact a professional contractor... An air handler with heater? s working fine 2013–2020 dynamic Mechanical Plumbing heating & Conditioning. Furnace blows cold air # 1 – your thermostat up a few potential for! 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