Why a Heat Pump Will Blow Cold Air. Several issues could be going on with your home’s heat. Furnace Basics. 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. I don't know why. 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. In a dual zone system, you wind up with a blows cold one side, hot on other side condition. Well this could be caused by several things. It must push out the cold air from the vents before the warm air … The problem is if it’s 30 degrees or lower out it’s just blowing in freezing cold air. 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". I noticed today that only 1 of the thermostats showed cool ON … Been to Nissan twice. 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. Heat pumps typically produce air that is about 90-100°F, whereas furnaces can produce air as high as 120-125°F. Don't know brand or if it is a heatpump - think it may be since it is one unit supplying AC and heat. Heat pumps usually produce air that is 85-92°F. I picked up a whole housing subdivision of customers because the installation contractor did not hook this up properly. 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. Drivers changed air temperature far more often than they change the mode (defrost, floor heat, dash vents, etc. As nuts as it may sound, the air in your home can feel chilly even though the heat pump may be working completely fine. The cold air return lets in cold air when the furnace is 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. If you’re looking for some winter furnace maintenance, check out our post on the subject. My thermostat is off, but there is air blowing from my vents. 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. The Chevy Silverado climate control system uses several different components that come together to either cool down or heat up the cabin. In other words, it's not putting out any heat at all. Furnaces are one of … No heat to feet or defrost. 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 same effect happens with your furnace. Unreliable car heaters can make the cold winter months practically unbearable. This is plenty warm to heat your home to your desired 72°F. 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. That prevents your heat pump from blowing cold air out of the vents. As a result, any air that blows out of the vents while your heater is off will usually feel cold. A dirty air filter restricts airflow into your furnace. What is this and how can I stop this from occuring? 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. 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? Report Save. Heater working but only blows out front vents. 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. All vents are on the opposite side of the house than the furnace. ), so the temperature actuators generally fail first. I changed two conditions. Have an expert inspect your ducts along with the furnace. The colder the outside temperature gets the more air we have dropping from the vents. 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. My car is 2011 Chevy Impala. The nest seems to blow warm air normally but once it switches to alternative heat source, then it starts blowing cold air. This issue could be caused by an improper thermostat setting. 2 of the returns blows cold air out of the return vents but not out of the supply registers. Lately, cold air comes out from our vents, which are on the floor. 11. So you will feel air blowing through your vents but the air is not heated or cooled by your furnace system. ... because it gets automatically deducted. JustinRandy131. Before replacing Heater Control Unit, it would only blow hot air from front vents- With this replacement it will now change from cold to hot and the air flow pressure does change from the front vents when changing the setting dial but there is still no air at all to feet and defrost. Nest Thermostat Generation 3 2 years ago. Think of it like turning on a hot water tap. It could even be running in the air conditioning mode due to a malfunction. Change the air filter. Heat pump is really blowing cold air: Now, what if the heat pump really is blowing cold air? The same vents that provide my AC in the summer also provide heating in the winter. 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. My heat is blowing out cold air from the vents - Answered by a verified HVAC Technician We use cookies to give you the best possible experience on our website. Quickly shut thermostat off and then on again and problem was solved. 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. First, I opened the heat vent wider - This seemed to stop cold air return from blowing cold air when the furnace is off. Check that the fan blower switch is … Reasons Your Furnace is Blowing Cold Air. level 2. 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. William Reed on February 18, 2017: Hi my name is william and i have a 2005 dodge magnum. Let’s look at some common issues that would cause your furnace to blow cold air. This is when the furnace is NOT running. Items in red usually require a service call. We have 4 zones but normally leave one zone off. I fixed it for a homeowner in that subdivision, and they told their neighbors, and … 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. Meanwhile, the outside air is redirected back into the outside environment as a blast of icy cold air. Our Lennox system is doing the same thing now for several months. Chevrolet Silverado 1999-2006: Why Do My Vents Blow Only Hot or Cold Air? 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. To protect the heater from malfunctioning altogether, engineers embed automatic limit switches that are responsible for turning the heat-generating furnace off. But as it turns out, this is a furnace problem that comes up often in many Bay Area 5 Reasons Cold Air Comes Out of Your Vents When You Turn On the Heat 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. 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. Compromised flame sensor. 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. I have a combination AC/furnace system in my home. 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. When that happens, the HVAC system can be stuck on blows cold air or blows hot air. $85 for the last month when we haven't had heat or air on one single day seems high? Heater blows out cold air. (Sometimes this happens for 30-60 minutes.) If your furnace starts blowing warm but then quickly turns cold, the flame sensor may need attention. My thermostat is off, but there is air blowing from my vents. 1. share. 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. i.e. ... Nissan Rogue 2016 heating problem I noticed in my car today that my air vents are only blowing room temperature air. It blows cold air for the first 10 minutes of each heating cycle. The A/C is blowing cold air and is working fine. Why is cold draft air coming out of the vents? 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. This post will explain what causes cold air to come out of the vents when you have your heater on, when warm air should be coming out … Again this is when the heat is on. I set desired temp to 70. My husband and I have a propane furnace. Aside from the vents blowing out the dash at the driver and passenger, on the cars with the faulty calibration of the radiant heat sensor, you will also get cold air out the defrost vents and the floor vents. If you’ve got cold air blowing out of your vents when the heat is on, check out this guide, and follow the steps to diagnose, and potentially fix the problem. When one or more of these components fails, the heat or cold air … 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. It blows cold air when the heat is on. Car issues can make people scratch their heads. Maybe your heater is not blowing hot air even though the fan is running. Then heat starts to appear fine. We bought the home in 2004 and the previous owner updated the furnace from electric to propane. I have a 2010 Nissan Armada that is not blowing hot air when the heat is set on 90. 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". Below is a list of possible causes. 5 Reasons Why Your Furnace Might Start Blowing Cold Air. Cost for electric nowadays is out of this world. 3,770. I really hate the propane, but it is what it is. Let us explain… The air could be warm but still feel cool. What could it be? Hello, My furnace blows code air from vents when heat is 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. 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