Your furnace is supposed to heat your home, so the last thing you’d expect is to feel cold air coming from your home’s air registers when your system is running. The colder the outside temperature gets the more air we have dropping from the vents. When room temp falls below 70, heat kicks off and blows hot air through vents and everything is as expected but when temp reaches above 70, it starts blowing cold air even when settings are set to "Heat" and FAN it set to "Auto". Report Save. We build a house 1 year ago and when the temperature gets below 50 degrees outside we start getting cold air coming through 4 vents of our house. All vents are on the opposite side of the house than the furnace. We bought the home in 2004 and the previous owner updated the furnace from electric to propane. Sometimes we can rev the engine up which will, for some reason, get the heat coming out, but usually it takes driving it for a while before any heat will come out. I changed two conditions. Meanwhile, the outside air is redirected back into the outside environment as a blast of icy cold air. It blows cold air when the heat is on. The cold air return lets in cold air when the furnace is off. As soon as I stop at a red light, or am idling for any length of time the air coming out of the vents begins to lose temperature until it blows cool air. When that happens, the HVAC system can be stuck on blows cold air or blows hot air. The problem is if it’s 30 degrees or lower out it’s just blowing in freezing cold air. Restricted airflow can overheat your furnace, causing a safety control to shut off the burners. 1. share. 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. Hello, My furnace blows code air from vents when heat is off. Let’s look at some common issues that would cause your furnace to blow cold air. Just purchased a condo in AZ. William Reed on February 18, 2017: Hi my name is william and i have a 2005 dodge magnum. Heat pumps typically produce air that is about 90-100°F, whereas furnaces can produce air as high as 120-125°F. But as it turns out, this is a furnace problem that comes up often in many Bay Area All I have to do to get hot air again is give it a little gas, say 200 more rpms, and the heater immediately responds with warmer air, hot air if I maintain 1000 rpms. It could even be running in the air conditioning mode due to a malfunction. Check that the fan blower switch is … Quickly shut thermostat off and then on again and problem was solved. As a result, any air that blows out of the vents while your heater is off will usually feel cold. When one or more of these components fails, the heat or cold air … Have an expert inspect your ducts along with the furnace. 5 Reasons Why Your Furnace Might Start Blowing Cold Air. Cost for electric nowadays is out of this world. $85 for the last month when we haven't had heat or air on one single day seems high? We have 4 zones but normally leave one zone off. The air coming out of your vents might seem rather cool or your home is not staying as warm as the temperature you set. 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 a 2010 Nissan Armada that is not blowing hot air when the heat is set on 90. 5 Reasons Cold Air Comes Out of Your Vents When You Turn On the Heat This issue could be caused by an improper thermostat setting. The A/C is blowing cold air and is working fine. Why is cold draft air coming out of the vents? ... Nissan Rogue 2016 heating problem I noticed in my car today that my air vents are only blowing room temperature air. Heater working but only blows out front vents. Re: Air Through Vents even while ac/heat off Nov 19 2012, 6:24pm 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. The nest seems to blow warm air normally but once it switches to alternative heat source, then it starts blowing cold air. By continuing to use this site you consent to the use of cookies on your device as described in our cookie policy unless you have disabled them. ... because it gets automatically deducted. 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. To protect the heater from malfunctioning altogether, engineers embed automatic limit switches that are responsible for turning the heat-generating furnace off. 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. Most often this air will feel cold when the fan is “on” but if you don’t notice a change in your overall home’s temperature most likely this is just blowing out room temperature air. 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. The "blowing cold airs" periods eventually get shorter and shorter... as the "blowing hot air" periods get longer... and eventually, after 3-4 hours, the home is at the desired temperature. Well this could be caused by several things. 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. In a dual zone system, you wind up with a blows cold one side, hot on other side condition. I really hate the propane, but it is what it is. Why a Heat Pump Will Blow Cold Air. Furnace Basics. Home inspection noted no problems with AC unit. In other words, it's not putting out any heat at all. If you’re looking for some winter furnace maintenance, check out our post on the subject. My car is 2011 Chevy Impala. My thermostat is off, but there is air blowing from my vents. This is plenty warm to heat your home to your desired 72°F. If your car heater is suddenly blowing out cold air instead of heat in the middle of a bitterly cold winter, you have a good reason to be frustrated. In fact, when you stand in front of it, cold air rushes out of it as it it were connected directly to the outside of the house. I fixed it for a homeowner in that subdivision, and they told their neighbors, and … So you will feel air blowing through your vents but the air is not heated or cooled by your furnace system. Our Lennox system is doing the same thing now for several months. The neat trick with heat pumps is that in summer, this process is easily reversed, allowing the same mechanism to instead transfer heat out of your home, cooling it in the process. This might sound crazy, but a heat pump can be working just fine even if the air feels cold. ), so the temperature actuators generally fail first. level 2. Change the air filter. It’s normal – If you’re only getting a bit of cold air when your furnace first kicks on, but the air is nice and warm after a few minutes, it’s likely fine. Several issues could be going on with your home’s heat. The Chevy Silverado climate control system uses several different components that come together to either cool down or heat up the cabin. Been to Nissan twice. When my heat is on warm/hot air is coming out of the passenger vents - as it should; but the air coming out of the vents on the drivers side is cold. No heat to feet or defrost. I don't know why. Heat pumps usually produce air that is 85-92°F. Then heat starts to appear fine. Unreliable car heaters can make the cold winter months practically unbearable. JustinRandy131. That prevents your heat pump from blowing cold air out of the vents. (Sometimes this happens for 30-60 minutes.) Nest Thermostat Generation 3 2 years ago. Think of it like turning on a hot water tap. If your furnace starts blowing warm but then quickly turns cold, the flame sensor may need attention. I have noticed that when my heating is off in the winter, I can feel cold draft air coming from the vents in my home. 2 of the returns blows cold air out of the return vents but not out of the supply registers. i.e. Compromised flame sensor. As nuts as it may sound, the air in your home can feel chilly even though the heat pump may be working completely fine. What could it be? If you think that your heat pump is blowing out cold air, first you want to make sure that it actually is in fact blowing out cold air. 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