I usually have the windows down if the AC is off so I guess I never noticed. Roughly a century ago, a residential heating and cooling system were unheard of, but now we don’t know how to live without it. August 02, 2010. It feels like it's blowing, but I can't tell if it's as strong as when the heat is on. All vents are on the opposite side of the house than the furnace. I live in the midwest so it's c-o-l-d. We have an older home, with ac vents in the ceiling. Faulty or improperly insulated ducts can keep warm air from heating your home. I have to physically close the dash vents, and then i can feel the air a little stronger at the floor vents. Roughly a century ago, a residential heating and cooling system were unheard of, but now we don’t know how to live without it. It's not much, but noticeable. Only registered users may post in our forums. Can I get it at the standard hardware store like HD? Healthy air flow is vital to a heat pump. Yikes! Why is it that before the hot air come out of the vents, very cold air comes out? I guess we can try to insulate it more. This is when you begin to realize something is wrong. I tried all modes and all fan settings and could not stop the air flow. Poor insulation causes rapid cooling of the air as it moves through your home. fans work (1999 Cadillac Seville) All the lights indicate that the heater and air-conditioner should be working. The company says our Like this comment? Double check your home’s ductwork if you can to check for air leaks. 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. 2004 Chevy Tahoe. We noticed cold air blasting up from our heat vents last night. Items in red usually require a service call. The air coming out of your vents might seem rather cool or your home is not staying as warm as the temperature you set. But only cold air seems to be coming out of your vents. If you want to keep cold air form coming into the cabin, press the recirc button. 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. Have reset thermostat 3x already and ran through checks. It’s winter. It wasn't always like that, so I'm thinking it's something new. Well this could be caused by several things. Where can I get one? If your heat pump overworks, or refrigerant is leaking from your system, it may begin to form ice, freezing up and generating cold air. If so, your heat pump is blowing warm air that just feels cold to you. I have a draft occurring in my 2 story home, usually on windy days. This is because hot refrigerant circulates through the outdoor coil, which in turn melts the frost. Infrared thermometer? Answer + 5. Your Pilot Light Is Out As a result, any air that blows out of the vents while your heater is off will usually feel cold. I can shut off the upper vents manually, or take the climate control into manual mode to direct the air only at my feet, but I still get cool air out of the side window defogger vents, which blows on my head too. 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? spider. Without a flame sensor, your gas furnace has no idea how to power on or distribute warm air. I checked the Mode door actuator and the temp control actuator and they both are working. It comes on for about 3 mins releasing cold air then shuts off. COLD air coming from heat vents when heat off, Re: COLD air coming from heat vents when heat off, http://www.bobvila.com/HowTo_Library/Insulating_Ducts_for_Efficiency-Insulation-A1780.html, Powered by UBB.threads™ PHP Forum Software 7.6.2. Visitor in Newbury Park, CA on . What Does Cold Air Come Out of Your Vents When You Turn On the Heat? As for the DIY project if your covers are metal I would suggest using a magnetic tape or adhesive sheets to attach them. Your objection to the proposed R values sound reasonable to me. We have forced air heat. Haven’t touched inner parts of thermostat don’t know how to. 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. 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. Don't panic if you see frost on your outside equipment's coil. Favorite Answer. In the basement (which is finished), cold air is coming from the heat registers, quite noticeably, and when the furnace isn't running. Heat pumps typically produce air that is about 90-100°F, whereas furnaces can produce air as high as 120-125°F. Make sure you tell the HVAC company you aren’t experiencing any heat for quick service. Let’s look at some common issues that would cause your furnace to blow cold air. What to do: Go to your thermostat. The reason for this, is that in the cooling mode, the outdoor coil actually becomes hot. When set to “on”, the fan on your furnace will blow continually, even when the furnace isn’t actually heating the air. 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. Their purpose is to allow air to return to the furnace to be heated or cooled. What’s the problem? If you want to keep cold air form coming into the cabin, press the recirc button. Sometimes, if the duct leakage is really bad, the air coming from your vents might feel less warm or weaker than normal. I have a combination AC/furnace system in my home. Well, there might not be a problem at all. Checked blower motor. Double check that the thermostat has fresh batteries. Make sure your thermostat is set to HEAT and your fan is set to AUTO. Your body temperature is around 98.6°F (everyone’s body temperature is slightly different, but that’s the average). This might sound crazy, but a heat pump can be working just fine even if the air feels cold. Ducts running thru unheated areas will normally radiate colder air, especially running thru or close to unheated areas. Heat blows on a auxiliary heat check but cold air with heat pump check. Sometimes Maybe I am old fashioned, but if I do not want air to come out of the dash vents, I want NO air to flow from vents. 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. It is an air inlet. You’re cold, and you’ve got the heat pump running. guests, and 1 Naturally this cannot be easy so what could it be now? Is this an engineered feature to keep air circulating. Your heat pump needs servicing. 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. Thermostat set to heat but cold air coming through vents. The outside temp is what comes through the vents whether the air or heat is on. It’s never fun when our furnace goes on the fritz, but either yourself or Front Range HVAC can have things up and running quickly. I disagree with the BobVila insulation page. 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. ? This happens within 15 minutes of the furnace turning off and we usually have about 2 hours between cycles so you can imagine how cold the 2 rooms get until the air kicks on again. These are symptoms of air pressure problems caused by poor airflow from HVAC systems. A lot depends on what you consider "almost having the a/c on." When the HVAC is off, the outside air pushes its way through the vents, that's also why sometimes you will notice on the lower speeds, that the air moves quicker when you are driving 70 mph vs stopped. Double check to see if your pilot light is on and that the burners (blue flames) are on as well. It could even be running in the air conditioning mode due to a malfunction. If your furnace starts blowing warm but then quickly turns cold, the flame sensor may need attention. To heat your home ’ s heating efficiency checked out by an HVAC.! Why is cold air blasting up from our heat vents last night was... 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