The other day, we noticed it was drafty (our house is cold anyhow in general) and I found that cold air is coming out of the air vents when the heat is not on. Anyway, cold air is felt coming thru the vent. Is this an engineered feature to keep air circulating. Naturally this cannot be easy so what could it be now? Your objection to the proposed R values sound reasonable to me. One common HVAC mishap is when your heater turns on, but the air coming out of the vents is still cold, so what should you do about that? If your furnace starts blowing warm but then quickly turns cold, the flame sensor may need attention. Nov 19 2012, 7:46pm. Where can I get one? What’s the problem? Several issues could be going on with your home’s heat. Answer. I have a ranch, w/ a little space in attic, but we never go up there (not finished--only storage). It’s not exactly a common problem, but it’s not unheard of, either. If you know what you’re up against and some basic troubleshooting tips, you may not always have to call on an HVAC service. If so, your heat pump is blowing warm air that just feels cold to you. Well, there might not be a problem at all. Your furnace may be blowing cold air because the filter is too dirty. Only registered users may post in our forums. Sorry - one other question. So why is cold air coming out of your vents? When set to “on”, the fan on your furnace will blow continually, even when the furnace isn’t actually heating the air. 5 Reasons Cold Air Comes Out of Your Vents When You Turn On the Heat No air coming out, weak air or low airflow from vents in your house or commercial space.The problem could be throughout the space, or you could have one AC vent not blowing air in one room. Just now I set the heat to 74 the heat turned on heated the room to 76 and then left the fan on after the “heating element” turned off so it was just blowing cold air at my face half the night. 11. Favorite Answer. Please register and join our community. Double check that the thermostat has fresh batteries. Here’s what we mean: Heat pump air might just feel cool The heat pump may be blowing warm air; it just does not “feel” warm. Why is it that before the hot air come out of the vents, very cold air comes out? 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. The air coming out of your vents might seem rather cool or your home is not staying as warm as the temperature you set. of Energy and a few other sites had similar R value requirements, so there must be some explanation. However, I am getting 50% cold air from the dash vents and 50% cold air from the floor heater vent. One common HVAC mishap is when your heater turns on, but the air coming out of the vents is still cold, so what should you do about that? This is when you begin to realize something is wrong. ? Most pros recommend insulating your ducts up to the floor vents. 2004 Chevy Tahoe. hi, I'm hoping some of y'all know about this problem. Answer + 5. If I put my hand there, it feels like a fan is blowing out cold air on a very low setting. 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). Answered. Double check your home’s ductwork if you can to check for air leaks. A lot depends on what you consider "almost having the a/c on." I just want to stop the cold air from coming out of the vents when the furnace is off and the cold air coming out of the filter slot in the furnace. Yikes! Ducts running thru unheated areas will normally radiate colder air, especially running thru or close to unheated areas. It's not much, but noticeable. Check the furnace’s air filter. It is most likely a leaky duct system—but you should have your home’s heating efficiency checked out by an HVAC professional. Your objection to the proposed R values sound reasonable to me. Checked furnace filter and vents It wasn't always like that, so I'm thinking it's something new. 0 registered members (), Turned out it wasn't the vents, but the tiny space between the metal of the vents and the wood of the subfloor. If you suddenly notice the unpleasant surprise of your cold air coming out of your vents, several things may be happening to your heater to cause this strange phenomenon all centered on a “RESTRICTION” theme. This is plenty warm to heat your home to your desired 72°F. I set desired temp to 70. As a result, any air that blows out of the vents while your heater is off will usually feel cold. I have to physically close the dash vents, and then i can feel the air a little stronger at the floor vents. Here’s what to do if you notice cold air coming from your vents: Install insulation. We have forced air heat. When the heat is on, the warm air blows, but otherwise, it's blowing cold air - it almost feels as if it's A/C air. Recently bought a house In Pa. It’s winter so put the thermostat on 72 and waited for heat. Very cold air coming out of heat vents. Why can I not get full A/C air out of my dash vents. If your pilot if off, relight if you know how to, if the burners don’t come on, you may need to call your local HVAC. 10 It’s winter. 317 Inverness Way South Ste 110 Englewood, Co 80112. No heat or cold air coming out of vents. Several things can potentially go wrong with automotive heaters because, much like a home heating system, there are many components working together to heat your car. Faulty or improperly insulated ducts can keep warm air from heating your home. The reason the fan shuts off during this process is so the system doesn't pull the cold air from the outside across the coil while the hot refrigerant circulates. Heat blows on a auxiliary heat check but cold air with heat pump check. Heat pumps usually produce air that is 85-92°F. But seeing as I don't feel it on the other vents on the other side of the house (that are on the same zoning), it just seems counterintuitive. In some cases, your pilot light may be on, and the blower may be on, but the burners are not. I tried all modes and all fan settings and could not stop the air flow. The air was coming from around the vents. So you will feel air blowing through your vents but the air is not heated or cooled by your furnace system. If you have leaky or holey ducts, they could be causing harm to your HVAC. Your Pilot Light Is Out Unreliable car heaters can make the cold winter months practically unbearable. Poor insulation causes rapid cooling of the air as it moves through your home. Thermostat set to heat but cold air coming through vents. What follows are some explanations why cold air is coming out of your air vents. I bought a 2019 Niro EV a couple weeks ago. I live in the midwest so it's c-o-l-d. We have an older home, with ac vents in the ceiling. Items in red usually require a service call. Clogged air filters could be causing cold air to blow out of your vents. Make sure you tell the HVAC company you aren’t experiencing any heat for quick service. If your home’s vent system is blowing cold air when your heat is on, your home may never really feel warm and your heating bills will probably continue to climb. If you have gone through these basic troubleshooting tips and you are still blowing cold air, you’re ready to make a call to your local HVAC service to have the issue diagnosed and fixed by a professional. August 02, 2010. So if you feel the air blowing out of the vents while the furnace is off, the air will seem cool since it’ll be at about room temperature. The reason that a back-draft occurs is the same reason that air moves any where there is higher pressure one end than the other, if the main part of your home is at a lower pressure than that in the return you will have a draft from the cold air return, so look for any exhausts that may be on or chimney vents , anything that vents out of your home. Leaks in your supply ducts push heated air into your attic or crawlspace. I hope this helped, Re: Air Through Vents even while ac/heat off. First, shut your heater and fan to the off position on your thermostat, because if your vents are blowing hot air, continuing to run your heater will only continue the problem. Check the filter, if it is clogged or dirty, replace it with the same filter and try your furnace out again. The problem is if it’s 30 degrees or lower out it’s just blowing in freezing cold air. Reduces volume of hot air blown out– Blocked return air means the furnace has less to blow out your supply vents, leaving you chilly. guests, and 1 For those with gas furnaces, an outed pilot light is a very common problem for causing cold air to blow from the vents instead of heat. If you turn on the heating system and notice that cold air is coming out through the vents, then this shouldnâ t be puzzling, especially if the system has been off for a while. The outside temp is what comes through the vents whether the air or heat is on. If everything seems to be in proper order on your thermostat, move on to the next step. My thermostat keeps showing auxiliary heat and it blows cold air. Below is a list of possible causes. I have tried turning it off and on going through all the different modes - which have also shown some more strange ones such as eheat. Tried reinstalling software. Like this comment? Bottom line: Don't panic if you have a heat pump and if cold air blows out of your duct work for a little while on and off while you run your heat at home. Make sure your thermostat is set to HEAT and your fan is set to AUTO. If you want to keep cold air form coming into the cabin, press the recirc button. The other day, we noticed it was drafty (our house is cold anyhow in general) and I found that cold air is coming out of the air vents when the heat is not on. Heat pumps typically produce air that is about 90-100°F, whereas furnaces can produce air as high as 120-125°F. of Energy and a few other sites had similar R value requirements, so there must be some explanation. If you see steam coming out of your outdoor coil that is a normal operating procedure for a heat pump system, so don't be alarmed. Happy New Year All. Exterior wall wasblowing cold the ceiling air grills- also known as “ cold on! 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