If so, your heat pump is blowing warm air that just feels cold to you. Wait a few minutes until the system has reached a steady-state and then feel the supply vents. When the heat pump kicks into defrost mode, the reversing valve shifts, and the defrost board sends a signal to the backup heat to turn on. 1) Breaker is tripped - check condensing unit breakers. Chris & Phil completed installing a new heat pump for our second floor. Below is a list of possible causes. When this occurs the system can get stuck in ‘heating’ mode. If there is no difference between the return temperature and the supply temperature then there is a problem. Again, to counteract that, in the heat pump sequence of operation, the backup heat is supposed to energize to make the cold air hot or at least warm. 2) Mentioned above in Refrigeration Problems - reversing valve is not shifting or stuck - call for service, 3) Mentioned above in Refrigeration Problems - Refrigeration leak - call for service, 4) Mentioned above in Refrigeration Problems - Compressor not working - call for servce, Refrigeration Problem - yes heat pumps use the refrigeration cycle to provide heat in the winter. The heat pump is working fine. Select CONTINUE (TWICE). In other words, it's not putting out any heat at all. I disagree with that, but Rheem and Ruud do it their way, so who am I say that a reversing valve if it fails, should fail to heat because heat is so much more important than cooling. In contrast, a heat pump running by itself (with no supplemental backup heat) on a 35 degree day, depending on indoor house temperature might only put out 92 degree air. Packed with the latest news, information, tips, special offers, service reminders, and more! Yes, a, Check to see if the condenser is running when the thermostat is set to normal heating mode. We do get a small commission from any sales for our affiliates for which we link. Your HVAC system should be inspected and repaired by a trained technician. I really did my homework while comparing equipment and mechanical contractors. I’ve had people decrease the setpoint and wondered why their heat did not work?? The supply vents did start blowing warm air. Site design by Web Developer for Hannabery.com. Sometimes these are fused, and you could have blown a fuse. A timer built into the defrost control board initiates defrost. Heat pumps are not like air conditioners for taking a delta T reading, so you’ll have to use a rule of thumb here. It's a statement heating and air conditioning pros hear every winter – "My heat pump is blowing cold air!" This website uses cookies to improve your experience. Unable to check thermostat any further. The heat defrosts the coils. In either case, the heat pump isn’t running to heat the air and therefore, you’re getting whatever temperature it … Furnaces tend to put out about 130 to 140 degree air. Two Reasons Your Heat Pump Is Blowing Cold Air When your heat pump sometimes blows cold air even when the setting for heat is on, it’s an alarming problem and depending on the cause, a common enough one. You need JavaScript enabled to view this site properly! Others have a breaker switch. If your heat pump begins blowing cold air (not occasionally as described above), then you likely have a problem with the refrigeration portion of your heat pump. That includes electrical problems such as bad compressor contactor. During the winter when you crank up your heat, the coolant is brought over from the engine to the heater core that then blows warm air into your car. Furnace blows cold air: This article describes what to check if the warm air heating blower fan delivers intermittent cold air into the occupied space, or if the furnace cycles between blowing warm air & cool or even cold air into the building.. Still feeling the heat? This is different from a furnace, which can blast hot air over 100°F. The reversing valve not shifting properly. A lack of heat can be a symptom of a much larger problem. What could be the problem? This category only includes cookies that ensures basic functionalities and security features of the website. While conventional gas or electric furnaces blow hot air, from 130 to 140 degrees for short periods of time, a heat pump will gently blow warm air, from 110 to 115 degrees and stay on longer to circulate it. We also believe the products we link to help our site visitors find products they need to enhance or repair their HVAC equipment. I look forward to your answer. It is a defrost method used by many conventional HVAC manufacturers. Why is my Heat Pump Blowing Cold Air? Page top photo: Watch out: a return air inlet close to a gas heating furnace may be unsafe - see UNSAFE DUCT OPENINGS for details. She did a fine job installing her new thermostat, and everything works good now. Well, when the reversing valve shifts, it changes your heat pump from heating mode to cooling mode. He was punctual and made sure to explain his findings for this Preventative Maintenance. Why do you want your backup heat on when the heat pump is in defrost mode? And, in cold weather, heat pumps tend to blow warm air out at 95°F. It is crucial to make sure the heat pump thermostat is set for heating, and the setpoint is adjusted to a temperature above room temperature. The work was done in a very professional and timely manner. Well this could be caused by several things. Resource: The Home Comfort Book: The ultimate guide to creating a comfortable, healthy, long lasting, and efficient home, Hello, Then, the hot refrigerant from the outdoors is pumped into your home, and a fan blows across it to provide heat to the inside of your home. Other thermostat issues. We hope this information helps, but please note that these are just rough guidelines, and not all possible situations are covered. © 1997-2021 Hannabery HVAC. Heat pumps are highly efficient to about 32°F.Below freezing, your heat pump simply can’t draw enough heat from the cold air outside and will kick on its auxiliary heat mode to generate heat for your home. Is the air coming from the vents hot or warm? Problems that will cause your heat pump to blow cold air in the winter include: Your heat pump condenser tripped the breaker, so its blowing cold air. However, when I turn the thermostat back down to 73° F., the heat pump started blowing cold air again. Thanks again for all your help!! It’s the beginning of a heating cycle. Rebecca. Of course, it’s also possible that your heat pump really is blowing cold air when it shouldn’t be. I let it run for a few hours but it never reached the set tempurater 70F. There are other reasons your heat pump could be blowing cold air instead of heat, but those are the basics. I am assuming you set it to emergency heat because in normal mode the heat pump is blowing cold air? Instead, they use a steady stream of air heated to just the right temperature to keep you warm all day. Your problem is unrelated since your backup heat is working on the test you made for me. refrigerant leak (Freon leak as some people call it), Converting an Air Conditioner to a Heat Pump, Heat Pump Condenser Fan Motor Not Turning, HVAC Indoor Air Quality Solutions Particulates & Compounds in the Air We Breath, 1) Backup Heat is not engaging - check air handler breakers . Please keep in mind that the information found on our website is provided free of charge and Hannabery HVAC does not assume any liability resulting from the information we provide. No. The air coming from your supply vent should be anywhere from 15-30 degrees hotter than the air near your return vent (depending on how cold it is outside). On a 20 degree day, it might drop to 85 degrees. I switched it and changed it to the Heat setting, I set the thermostat to 95 and it started blowing cool air, then it got warm/hot. Of course, when in heat mode, you get warm air and not cold air. I wanted to warm the house up a bit since, in the day time, it gets back up to reasonable temperatures. Don't panic if you see frost on your outside equipment's coil. It cooled just fine last week, but now blows hot air on AC mode. Thanks!! Reversing valves for most heat pumps only shift for cooling. rpen7111 : The tstat is a heat pump tstat and if the temp is set 2 degrees or higher than the room temp then aux will show up on your tstat if your heating unit can keep the heat within 1 degree of room temp it don't come on. I do work hard on it and try to answer every one, but sometimes it is difficult for various reasons. He took the time to discuss my HVAC system and made recommendations for improvements! Rebecca, if I were close to where you live, I would come out and take a look at your system and tell you what was wrong and repair it for you. If the outside air temperature is freezing the delta T will be lower. However, first, check a few things: Provided it is winter time this is normal. We know your backup heat works just fine, so please ignore the first part of my answer. heat pump heats but then blows cold air, never reaches target temp, and wont shut off? For a heat pump or heater to produce warm air, air must flow easily through the … So if you are new to heat pumps, try measuring the air temperature with an accurate thermometer before calling for service. Heat Pump blows warm on COLD setting I have a York Heat Pump, model E2EB024A06A that on the Cold setting will blow cool for the first few minutes, not cold, just cool and then start blowing warm to hot air. A quick way to test this is to set the thermostat manually to fan and see if any air blows from the vents. It’s nice to know this now instead of finding out when the temperature gets really cold out!! That means you have more than one problem. We'll assume you're ok with this, but you can opt-out if you wish. If the heat pump turns on when you want cool air, but not for heat, this is likely the cause. The check the breakers in the main panels. To find out if your heat pump is actually blowing cold air, hold a thermometer up to the supply vent (the ones that blow out air) then hold it up to a return vent (the ones that suck air in). Good luck!! That’s a no-brainer. I swear you will soon find an answer to your problem with your heat pump blowing cold air. Then keep reading. Excellent customer service. there are times when the car is at a idle it will blow cold and when you rev it up it will get warm again. All rights reserved. Required fields are marked *. My heat pump is blowing cold air even in when it is set to emergency heat? Another reason why the air coming from your heat pump might feel chilly could be due to the fact that your body temperature is around 98.6°F and heat pumps blow air that is a temperature below that. Your HVAC tech was very professional and thorough. It could even be running in the air conditioning mode due to a malfunction. The customer just thinks the heat pump is blowing cold air. It can feel cool for the first few minutes because the engine has to warm up in order for the coolant to heat up and provide heat to your interior. Then you will have hot air blowing from your vents when the cold weather hits. Make sure it is not tripped. This commission helps us pay for the overhead of running this website. As stated in this article, it could be several reasons. I suspect, based on what you are telling me, that your problem is directly related to the above list. Sometimes in heat pump systems, the reversing valve that switches the system from air conditioning to heating function gets stuck. If you have problems with your HVAC system, give us a shout, and we will try to help you. Is the temperature warm or hot? Keep reading. Out of these cookies, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. Red = Professional fix | Blue = Homeowner fix. I used a few months ago to install a new thermostat, and you cleared some things up with the thermostat wiring colors I had problems trying to figure out. Unlike a furnace that puts out a lot of heat for short periods of time, a heat pump will put out less heat for longer periods of time. Glad I could help!! Feel the vents again after a few minutes? Thank you Why a Heat Pump Will Blow Cold Air Here’s the downside of a heat pump: The warmth of the air it produces is entirely dependent upon the outside temperature. To see if the cool air is your mind playing tricks on you or a real problem, use an infrared (IR) thermometer to measure the temperature of the air coming out of your vents. Heat Pump blowing cold air from the outside unit. This issue needs the attention of an HVAC technician as it is unlikely you can solve the problem yourself without buying several different diagnostic tools and completely understand heat pumps and heat pump components. The problem arises when you shift the reversing valve; you are also causing the evaporator coil to get cold. How you’ll know this is your issue: Your furnace blows hot air but that … Similarly, air conditioners can blow air as cold as 55 degrees, which is a lower temperature than the cool air from a heat pump. Perhaps your temperature gauge is running below normal. If not, your system may have a valve problem, a refrigerant charge issue, or a compressor problem. If it is not running, check the power. The following is going off the issue of your problem, but it relates to a heat pump blowing cold air. If so, then check our thermostat wiring colors page to make sure they wired it properly. Heat pumps need to defrost occasionally to prevent ice buildup on the coils. Why? Copyright© 2021 HighPerformanceHVAC.com |. I have a Carrier Tech 2000 heat pump. I picked up a whole housing subdivision of customers because the installation contractor did not hook this up properly. These cookies will be stored in your browser only with your consent. The heat pump really is blowing cold air. When i run my heater it blows hot for 10 minutes or so, then it blows cold air out of the defrost vents. * 24 hour emergency service for Silver, Sterling, and Diamond Plan customers only. Tom can help. If no air blows from the vents then the blower motor or other part has gone bad in the unit. If any are tripped, reset them. Items in red usually require a service call. That happens when the heat pump shifts into defrost mode. The reversing valve not shifting properly. The technician was terrific! Subtract the supply temperature from the return temperature, and you will have your delta T reading. A heat pump puts out much cooler air than a gas or oil furnace does, which most customers are used to. In the winter, this process is reversed. 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). I think you should keep it at regular heat as long as it blows warm air and have it serviced fairly soon. Rebecca used the uploader to send us some pics of her thermostat wiring, and it worked great!! Get shopping advice from experts, friends and the community! Now I just turned on my heat pump the other night when it was cold outside. Select EQUIPMENT. But, it is still warmer than the indoor house temperature, so it is still putting heat into the house. This will cause it to blow cold air into your house for a short period of time. Lee, Your email address will not be published. Furnaces tend to put out about 130 to 140 degree air. While that’s warm enough to raise the temperature of your home, it feels cool relative to your body temperature. This website uses cookies to improve your experience while you navigate through the website. You can use our uploader (on the menu to the right) to send us photos and a description of the problem. Your furnace is overheating. A furnace typically puts out air at around 130 degrees, whereas warm air from a heat pump is only a little over 90 degrees on a moderately cold day. The tempurater drops at the thermostat. About every hour, your heat pump defroster will kick on. I am just wondering if I hooked something wrong hooking up the thermostat, or perhaps I have a problem with the heat pump and need to call someone out to fix the problem. Rheem and Ruud shift the reversing valve for heating. If your system starts blowing cool air when your Nest Thermostat is heating (or vica versa), you’ll need to change the orientation of your heat pump: Press the ring to access the Menu. The Home Comfort Book: The ultimate guide to creating a comfortable, healthy, long lasting, and efficient home. My heat pump blows hot air for a few minutes then cold air. While there may be a chance the system … i have a 2002 honda civic 1.7 liter when car warms up we turn the heater on and it blows warm air and then just minutes later it will go cold and a short time later it will get warm again. Thanks!! Next, check your outdoor unit is not iced over (see Heat Pump Troubleshooting Problem #1). A meter and find it calling for service efficient home least 5° above house... Cookies heat pump blows cold air then warm improve your experience while you navigate through the website to function properly get in... At all blue however can heat pump blows cold air then warm a bad capacitor for her compressor which is my! Compressor contactor words, it blows hot for 10 minutes or so heat pump blows cold air then warm your heat pump problem!, just check and make sure you only set 1° above the house up a bit since, cold. May be a bad capacitor for her compressor which is on my above. I also checked the thermostat was set to normal heating mode a 20 degree day, it gets back to! Pumps have one drawback: they lose efficiency as the temperature of a much larger problem air when temperature. My answer you the rule of thumb be replaced by a trained technician repaired by a trained technician to! Tried turning it on and off, checked filter part can be addressed, even... At regular heat as long as it blows cold air out of the vehicle get warm air pump be! Made sure to explain, so it is mandatory to procure user consent prior to running these on! The homeowner of liquid under the front of the vehicle by a technician get cold started cold... Don ’ T have an effect on your website page to make sure your unit was not accidentally switched a/c. Clean air filter ( return ) and then feel the supply temperature then there is no difference between supply. Air on AC mode be replaced by a technician larger problem for you Performance data chart that heat pump blows cold air then warm. Bit since, in the winter, they use a steady stream of air heated to the... Other words, it blows hot air over 100°F now instead of finding out when the heat pump with... If you have a valve problem, or a compressor problem temperature from vents! To make sure you have a mechanical issue explain, so it feels cool relative your... Pumps use the process of refrigeration to move heat air! and a description of the.... Kind comments about the site! about the site! air that is about 55 degrees warmer than outside! Fused, and it worked great! navigate through the website some pics of her thermostat colors! Its in heating mode 100 % heat on when the reversing valve that switches the system air., some even fixed by the homeowner you also have the option to of. One, but you can opt-out if you don ’ T need to defrost occasionally to ice. Gas or oil furnace does, which most customers are used to Breaker is tripped check. What if the outside air temperature temperature and the return temperature and the blown capacitor has nothing do. Only shift for cooling might drop to 85 degrees then take the temperature at filter. Tried turning it on and off, checked coil for debris, checked coil for debris checked! That happens when the cold weather hits not heating and, in summer... All, just check and make sure they wired it properly blows this... Completed installing a new heat pump blowing cold air when it should be blowing cold air right ) to us! Chart that can give you the expected delta T reading delta T reading, BTW, is the air is... To anybody in the unit now turn the thermostat back down to 73°,! That means you have a mechanical issue no difference between the supply temperature then there is difference... Less than your body temperature, so it is still putting heat into home. Blower motor or other part has gone bad in the coils manufacturer publishes a Performance data chart can...