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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. 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. If you’re looking for some winter furnace maintenance, check out our post on the subject. Some of the reasons your furnace might blow cold or feel like there isn’t as much warm air coming from the vents include: An improper thermostat setting. Drivers changed air temperature far more often than they change the mode (defrost, floor heat, dash vents, etc. $85 for the last month when we haven't had heat or air on one single day seems high? It blows cold air for the first 10 minutes of each heating cycle. It must push out the cold air from the vents before the warm air … 3,770. I changed two conditions. What could it be? Hello, My furnace blows code air from vents when heat is off. 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. Let us explain… The air could be warm but still feel cool. However, if you force the air out the vents only, using the 'mode' control, it will blow warm out those vents, if the system is working correctly. Last week, at one point, I turned AC on and cold air was blowing out of return instead of sucking and no air was coming out of supply's. 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. Compromised flame sensor. (Sometimes this happens for 30-60 minutes.) Unreliable car heaters can make the cold winter months practically unbearable. 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. 5 Reasons Why Your Furnace Might Start Blowing Cold Air. Reasons Your Furnace is Blowing Cold Air. 1. share. My thermostat is off, but there is air blowing from my vents. Heater blows out cold air. I don't know why. Think of it like turning on a hot water tap. Don't know brand or if it is a heatpump - think it may be since it is one unit supplying AC and heat. Car issues can make people scratch their heads. Why is cold draft air coming out of the vents? 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? 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. 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. Report Save. Check that the fan blower switch is … Have an expert inspect your ducts along with the furnace. This might sound crazy, but a heat pump can be working just fine even if the air feels cold. We bought the home in 2004 and the previous owner updated the furnace from electric to propane. 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. 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. It could even be running in the air conditioning mode due to a malfunction. Maybe your heater is not blowing hot air even though the fan is running. 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. Several issues could be going on with your home’s heat. 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. Furnaces are one of … All vents are on the opposite side of the house than the furnace. Lately, cold air comes out from our vents, which are on the floor. 5 Reasons Cold Air Comes Out of Your Vents When You Turn On the Heat But as it turns out, this is a furnace problem that comes up often in many Bay Area Below is a list of possible causes. 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". Cost for electric nowadays is out of this world. 11. First, I opened the heat vent wider - This seemed to stop cold air return from blowing cold air when the furnace is off. Home inspection noted no problems with AC unit. 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. A dirty air filter restricts airflow into your furnace. 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. 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. The same vents that provide my AC in the summer also provide heating in the winter. To protect the heater from malfunctioning altogether, engineers embed automatic limit switches that are responsible for turning the heat-generating furnace off. Just purchased a condo in AZ. 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. My car is 2011 Chevy Impala. Well this could be caused by several things. 2 of the returns blows cold air out of the return vents but not out of the supply registers. Why a Heat Pump Will Blow Cold Air. I noticed today that only 1 of the thermostats showed cool ON … 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. If your furnace starts blowing warm but then quickly turns cold, the flame sensor may need attention. William Reed on February 18, 2017: Hi my name is william and i have a 2005 dodge magnum. My thermostat is off, but there is air blowing from my vents. We have 4 zones but normally leave one zone off. When we start our van the vents blow consistent cold air when the adjustment is for heat no matter how long we "warm it up". The A/C is blowing cold air and is working fine. My husband and I have a propane furnace. The air coming out of your vents might seem rather cool or your home is not staying as warm as the temperature you set. Restricted airflow can overheat your furnace, causing a safety control to shut off the burners. Furnace Basics. This is plenty warm to heat your home to your desired 72°F. 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. In a dual zone system, you wind up with a blows cold one side, hot on other side condition. I have a combination AC/furnace system in my home. 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. Our Lennox system is doing the same thing now for several months. 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