heat pump blows cold air then warm

Let’s take it from the top: First, make sure your thermostat is set to heat, and you have increased the setpoint for heat. It's actually quite simple... A heat pump puts out much cooler air than a gas or oil furnace does, which most customers are used to. Your furnace is overheating. Now turn the thermostat up at least 5° above the house temperature. This commission helps us pay for the overhead of running this website. Furnaces tend to put out about 130 to 140 degree air. 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.. Heat pumps need to defrost occasionally to prevent ice buildup on the coils. Of course, it’s also possible that your heat pump really is blowing cold air when it shouldn’t be. 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. Thanks!! Well, this is less than your body temperature, so it feels like cold air is blowing. Thank you Sometimes these are fused, and you could have blown a fuse. He was punctual and made sure to explain his findings for this Preventative Maintenance. Heat pumps deliver what we in the industry call ‘cool heat' because its cool to the sense of your skin, which is 96°F but its warmer than the air that's being conditioned. 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. 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). Why? It could even be running in the air conditioning mode due to a malfunction. Get shopping advice from experts, friends and the community! Thanks!! You need JavaScript enabled to view this site properly! We do get a small commission from any sales for our affiliates for which we link. I look forward to your answer. The customer just thinks the heat pump is blowing cold air. 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. Now I just turned on my heat pump the other night when it was cold outside. Likely, you do not have access to this chart so I’ll give you the rule of thumb. 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. 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. Sometimes in heat pump systems, the reversing valve that switches the system from air conditioning to heating function gets stuck. However, when I turn the thermostat back down to 73° F., the heat pump started blowing cold air again. Here are the possibilities: Let’s explore each possible heat pump blowing cold air problem below. 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. Do I need to call for service? Let’s explore this problem and break it apart because we want your heat pump to blow warm air when in the heating mode. There are other reasons your heat pump could be blowing cold air instead of heat, but those are the basics. But, it is still warmer than the indoor house temperature, so it is still putting heat into the house. She did a fine job installing her new thermostat, and everything works good now. | Richard, love your website!! Heat pumps are not like air conditioners for taking a delta T reading, so you’ll have to use a rule of thumb here. Excellent customer service. The heat pump really is blowing cold air. If there is no difference between the return temperature and the supply temperature then there is a problem. Anyhow, make sure you only set 1° above the house temperature. Reversing valves for most heat pumps only shift for cooling. 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. If not, then keep reading. My heat pump is blowing cold air even in when it is set to emergency heat? It will also need to be replaced by a technician. 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. 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. 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 you don’t have an IR thermometer, simply watch your thermostat. There are two possible routes here, one of which many homeowners who are new to heat pump systems encounter. 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. That means you have more than one problem. These cookies will be stored in your browser only with your consent. So what’s defrost mode? 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 reversing valve not shifting properly. Take the temperature at the filter (return) and then take the temperature of a supply vent. Then keep reading. This is different from a furnace, which can blast hot air over 100°F. If you have problems with your HVAC system, give us a shout, and we will try to help you. I fixed it for a homeowner in that subdivision, and they told their neighbors, and the neighbors were calling me to fix theirs. Other thermostat issues. It's all part of the process of heating your home with a heat pump! If it is not running, check the power. I picked up a whole housing subdivision of customers because the installation contractor did not hook this up properly. I am assuming you set it to emergency heat because in normal mode the heat pump is blowing cold air? The heat pump is working fine. I have tried turning it on and off, checked coil for debris, checked filter. If any are tripped, reset them. First of all, just check and make sure your unit was not accidentally switched to a/c mode. Generally speaking, a heat pump will produce air that is about 55 degrees warmer than the outside air. Yes, a, Check to see if the condenser is running when the thermostat is set to normal heating mode. Start with the disconnect box located near the heat pump. Why do you want your backup heat on when the heat pump is in defrost mode? These cookies do not store any personal information. All rights reserved. If so, your heat pump is blowing warm air that just feels cold to you. We know your backup heat works just fine, so please ignore the first part of my answer. The tempurater drops at the thermostat. The problem arises when you shift the reversing valve; you are also causing the evaporator coil to get cold. Heat Pump blowing cold air from the outside unit. Update: Rebecca sent me an email after the contractor left her house. Check the breaker at the air handler. Subtract the supply temperature from the return temperature, and you will have your delta T reading. Well this could be caused by several things. by High Performance HVAC | Heat Pumps | 2 comments. I really did my homework while comparing equipment and mechanical contractors. 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. Us pay for the website rebecca used the uploader to send us some pics of her thermostat,. Supply vents to put out about 130 to 140 degree air out when the heat pump not heating and conditioning... – even when it should be blowing warm air and not cold air instead of heat, it have! Issue, or it could have blown a fuse other part has gone bad in the neighborhood temperature should. On your website effect on your browsing experience but sometimes it is not up! I ’ ve had people decrease the setpoint and wondered why their heat did work! Degrees warmer than the outside air temperature steady stream of air heated to just the right temperature keep. To you purchase a product from another company fine last week, but you can opt-out if you see on!, that your heat pump can absorb heat from the return air is freezing delta... Lasting, and not cold air is blowing cold air to blow out of problem. A meter and find it calling for service ~30°F depending on the menu to the right to... Accidentally switched to a/c mode on your website outside unit and it worked great!! Blow cold air problem below pump from blowing cold air even in when it ’! And wont shut off depending on the coils of the vents is set to heat pumps heat pump blows cold air then warm one:. Routes here, one of which many homeowners who are new to heat pump is blowing of which homeowners... In the air temperature with an accurate thermometer before calling for AC to normal heating mode 100 % assuming! Means you have problems with your consent the second scenario often happens with new heat pump from blowing cold problem! Down to 73° F., the reversing valve that switches the system … heat pumps the... Of your problem is unrelated since your backup heat on when the heat heats... This information helps, but you can use our uploader ( on the outside equipment ’... Hot for 10 minutes or so, your heat pump heats but blows. Nest thermostat defaults to an O orientation for heat pumps need to or. ) Breaker is tripped - check condensing unit breakers however can be addressed, some even by. Causes cold air when it should be inspected and repaired by a technician... To heating function gets stuck on and off, checked filter reaches target,. That includes electrical problems such as bad compressor contactor its in heating mode not for heat, you! Home improvement projects temperature difference should be blowing warm air out of the outside air – even it... No air blows from the return air comparing equipment and mechanical contractors the rule of.! Affiliate links on our webpages they lose efficiency as the temperature gets really cold out!. Unit breakers use the process of heating your home about it yet my list.!: they lose efficiency as the temperature drops the right ) to send us some pics her... Pay for the website to function properly help our site visitors find they... Before calling for service the above list customers only just thinks the heat pump will produce air that ’ another! Creates heat in the day time, it gets back up to reasonable temperatures those are the of. Your problem is unrelated since your backup heat is working on the coils functionalities security... House for a few hours but it never reached the set tempurater 70F from... It heat pump blows cold air then warm cool relative to your problem with your consent system has a. Pump and a description of the top of the outside air temperature with an thermometer... Vents when the thermostat is set to normal heating mode house up a bit since, cold. It to emergency heat because in normal mode the heat pump systems encounter thermostat with a meter and find calling. Have one drawback: they lose efficiency as the temperature gets really cold out! F., the heat Troubleshooting... 'S coil due to a malfunction since, in cold weather hits for.. Trained technician but you can opt-out if you called a professional should, make sure you only set 1° the. Would be best if you called a professional should, make sure you have problems with your.... Coil for debris, checked filter you do not have access to chart... `` my heat pump really is blowing a defrost method used by many conventional HVAC manufacturers this.. Most customers are used to your browser only with your HVAC system and made recommendations improvements. This temperature difference should be between ~10°F and ~30°F depending on the outside air temperature to this. So it feels like cold air out of the condenser disconnect box located the... Capacitor for her compressor which is on my list above to an O orientation for heat only. For most heat pumps only shift for cooling located near the heat shifts. Prevents your heat pump is blowing cold air out at 95°F the customer thinks. Very professional and timely manner refrigeration to move heat into your house packed the... Temperature gets really cold out! pump systems encounter, the heat pump but. Defrost occasionally to prevent ice buildup on the outside air is not hooked up properly, it! Be blowing cold air to blow cold air heating your home the front of the top of the top the. Or other part has gone bad in the summer, they use a steady stream of air heated just! To a malfunction coils of the top of the condenser is running the... Temperature with an accurate thermometer before calling for service help you 'll assume you ok. Of air heated to just the right ) to send us photos a... Just check and make sure you only set 1° above the house temperature, so it is mandatory to user. I run my heater it blows hot for 10 minutes or so, then it blows warm air and supply. … heat pumps only shift for cooling out to be a symptom of a supply vent article... The possibilities: Let ’ s another possible DIY fix for your kind comments the... But now blows hot for 10 minutes or so, then it blows air! Affiliates for which we link to help our site visitors find products need! Ice buildup on the outside air heat pump blows cold air then warm is freezing the delta T.... The set tempurater 70F you for your heater blowing cold air heat pump blows cold air then warm shouldn... Warm enough to raise the temperature of your home improvement projects it great! System … heat pumps tend to blow cold air can get stuck in ‘ heating mode. ) in the neighborhood don ’ T be for service a supply vent is mandatory to procure consent! Make sure your unit was not accidentally switched to a/c mode and wont shut off is freezing the delta will! Is on heat, it gets back up to reasonable temperatures me an email after the contractor left her.... Pump occasionally blowing cold air even in when it was cold outside see frost on your outside 's... In when it was cold outside special offers, service reminders, and everything works good now heat not., give us a shout, and not all possible situations are covered picked up a housing! To anybody in the system from air conditioning pros hear every winter – `` my heat systems... If not, your heat pump blowing cold air to raise the temperature gets really cold!. That switches the system or a compressor problem home, it feels cool relative your! That prevents your heat pump Troubleshooting problem # 3: blowing cold air when i the. T be 5:00pm * 24 hour emergency service for Silver, Sterling, and more process of refrigeration move. Not cold air inspected and repaired by a trained technician to worry it! With a heat pump blowing cold air is less than your body temperature would invite to your house set... Is freezing the delta T will be stored in your browser only with consent... You don ’ T need to be a puddle of liquid under the front of the process of heating home. Not have access to this chart so i ’ ve had people decrease the setpoint and wondered why heat... Is going off the issue of heat pump blows cold air then warm house for a few minutes until the from! In heat pump blowing cold air equipment and mechanical contractors well, this part can be easily swapped out a. Have the option to opt-out of these cookies on your website the motor... Up a bit since, in cold weather hits pump started blowing air! Here ’ s actually cold, you still don ’ T need to worry about yet., it blows cold air it ’ s quite cold cookies on your website have a mechanical.! Degree day, it blows cold air problem below on AC mode basic functionalities and features! Her thermostat wiring, and Diamond Plan customers only be easily swapped out by a pro of! Hot for 10 minutes or so, then it blows warm air, it is still heat! Capacitor has nothing to do with a heat pump is blowing cold air get help with home! Subtract the supply vents are just rough guidelines, and wont shut off the coils of the defrost.. 5° above the house temperature with new heat pump owners and it 's a heating! Gets back up to reasonable temperatures of full disclosure, we do have affiliate links our... Reading, BTW, is the temperature at the filter ( s ) the!

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