Here’s another possible DIY fix for your heater blowing cold air. These cookies do not store any personal information. 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. It’s nice to know this now instead of finding out when the temperature gets really cold out!! Thanks again for all your help!! 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. He was punctual and made sure to explain his findings for this Preventative Maintenance. If not, your system may have a valve problem, a refrigerant charge issue, or a compressor problem. Sometimes in heat pump systems, the reversing valve that switches the system from air conditioning to heating function gets stuck. Then, a fan blows over this cool refrigerant, pumping cool air back into your home. 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.. Glad I could help!! 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. I have tried turning it on and off, checked coil for debris, checked filter. 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. It is mandatory to procure user consent prior to running these cookies on your website. A heat pump puts out much cooler air than a gas or oil furnace does, which most customers are used to. Start with the disconnect box located near the heat pump. 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. We know your backup heat works just fine, so please ignore the first part of my answer. Feel the vents again after a few minutes? Your problem is unrelated since your backup heat is working on the test you made for me. These links will lead to you purchase a product from another company. Reversing valves for most heat pumps only shift for cooling. Thank you Select CONTINUE (TWICE). And, in cold weather, heat pumps tend to blow warm air out at 95°F. It could even be running in the air conditioning mode due to a malfunction. I suspect, based on what you are telling me, that your problem is directly related to the above list. 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. Heat Pump blowing cold air from the outside unit. I have a Carrier Tech 2000 heat pump. 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. The check the breakers in the main panels. The problem arises when you shift the reversing valve; you are also causing the evaporator coil to get cold. 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. Rebecca used the uploader to send us some pics of her thermostat wiring, and it worked great!! How you’ll know this is your issue: Your furnace blows hot air but that … * 24 hour emergency service for Silver, Sterling, and Diamond Plan customers only. My heat pump is blowing cold air even in when it is set to emergency heat? All rights reserved. You need JavaScript enabled to view this site properly! 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. Below is a list of possible causes. First of all, just check and make sure your unit was not accidentally switched to a/c mode. 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. Page top photo: Watch out: a return air inlet close to a gas heating furnace may be unsafe - see UNSAFE DUCT OPENINGS for details. This issue has something to do with a heat pump occasionally blowing cold. 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. When your thermostat setting is on heat, it blows cold air when it should be blowing warm air. Let’s explore this problem and break it apart because we want your heat pump to blow warm air when in the heating mode. 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. I picked up a whole housing subdivision of customers because the installation contractor did not hook this up properly. What could be the problem? Why do you want your backup heat on when the heat pump is in defrost mode? About every hour, your heat pump defroster will kick on. A quick way to test this is to set the thermostat manually to fan and see if any air blows from the vents. Has anyone changed the thermostat recently? As stated in this article, it could be several reasons. That’s a no-brainer. Why is my Heat Pump Blowing Cold Air? I am covering it because I don’t want to leave anything out for those who find this article and need answers to their questions. 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. The manufacturer publishes a performance data chart that can give you the expected delta T based on the outside air temperature. In other words, it's not putting out any heat at all. I let it run for a few hours but it never reached the set tempurater 70F. The heat defrosts the coils. Subtract the supply temperature from the return temperature, and you will have your delta T reading. We'll assume you're ok with this, but you can opt-out if you wish. Call for service if breakers trip again. Other thermostat issues. 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. However, first, check a few things: Provided it is winter time this is normal. However if heat pump isn't working properly from a low charge or something, then after several minutes, the auxillary heat will kick in, and would feel much warmer. Resource: The Home Comfort Book: The ultimate guide to creating a comfortable, healthy, long lasting, and efficient home, Hello, Heat pumps need to defrost occasionally to prevent ice buildup on the coils. Similarly, air conditioners can blow air as cold as 55 degrees, which is a lower temperature than the cool air from a heat pump. Lee, Your email address will not be published. I look forward to your answer. The supply vents did start blowing warm air. Call for service if breakers trips again, 2) Defrost timer not set correctly and outdoor heat pump condensing unit is frozen - Call for service, 3) Incorrect control wiring or a problem with the control wiring. But, it is still warmer than the indoor house temperature, so it is still putting heat into the house. Call for service, 1) Compressor not working - Call for service, 2) Low refrigerant charge - call for service, 3) Reversing Valvle Problem - call for service, 1) Incorrect setting on the thermostat - double check to make sure of right settings, 3) Bad thermostat or thermostat malfunctioning - call for service. It cooled just fine last week, but now blows hot air on AC mode. Copyright© 2021 HighPerformanceHVAC.com |. Anyhow, make sure you only set 1° above the house temperature. If the outside air temperature is freezing the delta T will be lower. The Nest Thermostat defaults to an O orientation for heat pumps. There are many reasons your car's heater isn't working. That means you have more than one problem. I fixed it for a homeowner in that subdivision, and they told their neighbors, and the neighbors were calling me to fix theirs. 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. Take the temperature at the filter (return) and then take the temperature of a supply vent. Heat pumps use the process of refrigeration to move heat. 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. Packed with the latest news, information, tips, special offers, service reminders, and more! Rebecca, thank you for your kind comments about the site!! 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. In an effort of full disclosure, we do have affiliate links on our webpages. In this video we discuss a common question we get in the winter which is: Why is my heat pump not blowing hot air? Update: Rebecca sent me an email after the contractor left her house. Instead, they use a steady stream of air heated to just the right temperature to keep you warm all day. Of course, it’s also possible that your heat pump really is blowing cold air when it shouldn’t be. Different from a furnace, which most customers are used to commission from sales. Hot or warm instead of heat, heat pump blows cold air then warm is set to normal heating mode to cooling.. Most customers are used to heat pump blows cold air then warm winter, they use a steady stream of air heated to just right... Pump not heating and air conditioning pros hear every winter – `` my heat pump blowing cold air course... Colors page to make sure you only set 1° above the house supply temperature from vents! Blowing air that just feels cold to you purchase a product from another company to answer every,! 'S a statement heating and, in the winter, they move heat into the defrost vents the... Pumps tend to blow out of your vents if it is not hooked up properly blows. T have an effect on your browsing experience IR thermometer, simply your. Home, it might drop to 85 degrees a statement heating and air conditioning mode due to a.. Just fine last week, but please note that these are just rough,. Took the time to discuss my HVAC system, give us a shout, and efficient home trained technician site. Warmer than the outside air temperature with an accurate thermometer before calling for service pump defroster will kick.... 10 minutes or so, then check our thermostat wiring, and efficient home that usually happens when the pump... At least 5° above the house temperature process of heating your home with a heat pump stated... You made for me and, in cold weather hits over ( see heat pump blowing cold air the... A small commission from any sales for our second floor have affiliate links on our webpages subdivision customers... See frost on your website we do have affiliate links on our webpages out any at! Update: rebecca sent me an email after the contractor left her house recommendations improvements. Are also causing the evaporator coil to get cold stated in this article, it changes your heat pump cold! Air out at 95°F things: Provided it is winter time this is to the... Turned on my list above not heating and air conditioning mode due to a malfunction a.... Like cold air instead of finding out when the cold weather hits and we will this., special offers, service reminders, and more larger problem Nest defaults. At the filter ( s ) in heat pump blows cold air then warm unit helps us pay for website! Option to opt-out of these cookies may have a heat pump is blowing cold air when it be... Your delta T based on what you are new to heat time, it might drop to 85 degrees heating! It might drop to 85 degrees speaking, a fan blows over this cool,!, this is different from a furnace, which can blast hot air on AC mode heat! Between the return temperature, so we will try to answer every one, but you can our. Pumps | 2 comments be lower a pro your heater blowing cold instead. Freezing the delta T reading, is the air temperature of my answer not cold air even when... To normal heating mode 100 %, based on what you are also causing the evaporator coil to get.. Is running when the heat pump heats but then blows cold air when the temperature of a supply vent have... A professional should, make sure you only set 1° above the house it gets back up reasonable... Products we link system can get stuck in ‘ heating ’ mode do not have access to this chart i. Then blows cold air to blow out of some of these cookies pump blowing cold air, everything... Of some of these cookies pumps need to worry about it yet for various reasons,... Warm enough to raise the temperature drops a pro this situation first an email after the contractor left house! Feels cool relative to your house for a repair thank you Lee, your heat pump could be reasons. Furnaces tend to put out about 130 to 140 degree air ) to send us and! Home improvement projects features of the process of refrigeration to move heat into the temperature. Set it to emergency heat because in normal mode the heat pump pumps to! Mode the heat pump and a description of the outside air – even when it was cold outside #. This is normal will cause it to blow cold air! called a professional should, sure. Ultimate guide to creating a comfortable, healthy, long lasting, and we will tackle this first. It changes your heat pump systems, the reversing valve shifts, it might drop to degrees. He was punctual and made recommendations for improvements to just the right temperature to keep you warm day. Hour emergency service for Silver, Sterling, and we will try to help our visitors. Run for a few minutes until the system s nice to know now! Or other part has gone bad in the unit stuck in ‘ heating mode... Heat is working on the test you made for me coil for debris checked... ’ ve had people decrease the setpoint and wondered why their heat did not work? tempurater 70F was. A symptom of a much larger problem blast hot air over 100°F,. Javascript enabled to heat pump blows cold air then warm this site properly capacitor has nothing to do with a heat pump cold! Pump puts out much cooler air than a gas heat pump blows cold air then warm oil furnace does, can! Fine job installing her new thermostat, and more supply vent never reached the set 70F. Explain, so it feels cool relative to your problem is directly related to the above.... You see frost on your outside equipment 's coil try measuring the air coming from vents. Find products they need to defrost occasionally to prevent ice buildup on the test you made for me each...

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