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. Keep reading. If it is not running, check the power. by High Performance HVAC | Heat Pumps | 2 comments. It’s the beginning of a heating cycle. The thermostat is set to “on” rather than “auto” When your thermostat is set to “on”, the fan in your … That prevents your heat pump from blowing cold air out of the vents. Chris & Phil completed installing a new heat pump for our second floor. We know your backup heat works just fine, so please ignore the first part of my answer. 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. What could be the problem? I’ve had people decrease the setpoint and wondered why their heat did not work?? Reversing valves for most heat pumps only shift for cooling. Good luck!! Let’s take it from the top: First, make sure your thermostat is set to heat, and you have increased the setpoint for heat. Rheem and Ruud shift the reversing valve for heating. Resource: The Home Comfort Book: The ultimate guide to creating a comfortable, healthy, long lasting, and efficient home, Hello, A heat pump puts out much cooler air than a gas or oil furnace does, which most customers are used to. Below is a list of possible causes. In an effort of full disclosure, we do have affiliate links on our webpages. The Home Comfort Book: The ultimate guide to creating a comfortable, healthy, long lasting, and efficient home. I fixed it for a homeowner in that subdivision, and they told their neighbors, and the neighbors were calling me to fix theirs. Turned out to be a bad capacitor for her compressor which is on my list above. Of course, it’s also possible that your heat pump really is blowing cold air when it shouldn’t be. Perhaps your temperature gauge is running below normal. The work was done in a very professional and timely manner. That means you have more than one problem. Rebecca used the uploader to send us some pics of her thermostat wiring, and it worked great!! Heat pumps have one drawback: They lose efficiency as the temperature drops. The heat pump is blowing cold air when the thermostat was set to heat. Lee, Your email address will not be published. The manufacturer publishes a performance data chart that can give you the expected delta T based on the outside air temperature. 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. I'd recommend Hannabery HVAC to everyone. 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). Necessary cookies are absolutely essential for the website to function properly. Next, check your outdoor unit is not iced over (see Heat Pump Troubleshooting Problem #1). Site design by Web Developer for Hannabery.com. Regarding your replay to my original comment, I turned the thermostat up to 80° F. when the house temperature was 72°, and the thermostat was set to heat. Then keep reading. Don't panic if steam comes out of the top of the outside equipment. The heat pump is working fine. 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. The reversing valve not shifting properly. © 1997-2021 Hannabery HVAC. Has anyone changed the thermostat recently? 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. Well, when the reversing valve shifts, it changes your heat pump from heating mode to cooling mode. The heat pump can absorb heat from the outside air – even when it’s quite cold! Page top photo: Watch out: a return air inlet close to a gas heating furnace may be unsafe - see UNSAFE DUCT OPENINGS for details. All rights reserved. Instead, they use a steady stream of air heated to just the right temperature to keep you warm all day. Select EQUIPMENT. 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 heat pump turns on when you want cool air, but not for heat, this is likely the cause. Why is my heat pump blowing cold air when I know its in heating mode 100%? He took the time to discuss my HVAC system and made recommendations for improvements! Similarly, air conditioners can blow air as cold as 55 degrees, which is a lower temperature than the cool air from a heat pump. 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. If they trip after rest call for service. A timer built into the defrost control board initiates defrost. Red = Professional fix | Blue = Homeowner fix. Your HVAC tech was very professional and thorough. Your furnace is overheating. Make sure it is not tripped. 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 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. This issue has something to do with a heat pump occasionally blowing cold. 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. There are two possible routes here, one of which many homeowners who are new to heat pump systems encounter. 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. 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. Required fields are marked *. A lack of heat can be a symptom of a much larger problem. Feel the vents again after a few minutes? If not, then keep reading. Generally speaking, a heat pump will produce air that is about 55 degrees warmer than the outside air. Now I just turned on my heat pump the other night when it was cold outside. Subtract the supply temperature from the return temperature, and you will have your delta T reading. Gas Heating Troubleshooting and Repair Index, Heat Pump Blowing Cold Air | Refrigeration Heating Troubleshooting, Heat Pump Blowing Cold Air Troubleshooting Matrix, My Heat Pump Occasionally Blows Cold Air On Heat Setting, Delta T for Heat Pumps and the Human Factor. Why? | Richard, love your website!! Either way, a professional should, Make sure you have a clean air filter(s) in the system. The tempurater drops at the thermostat. You can use our uploader (on the menu to the right) to send us photos and a description of the problem. If the outside air temperature is freezing the delta T will be lower. On a 20 degree day, it might drop to 85 degrees. This is different from a furnace, which can blast hot air over 100°F. When i run my heater it blows hot for 10 minutes or so, then it blows cold air out of the defrost vents. If so, then check our thermostat wiring colors page to make sure they wired it properly. A quick way to test this is to set the thermostat manually to fan and see if any air blows from the vents. But, it is still warmer than the indoor house temperature, so it is still putting heat into the house. While that’s warm enough to raise the temperature of your home, it feels cool relative to your body temperature. Other thermostat issues. Then, a fan blows over this cool refrigerant, pumping cool air back into your home. 1) Breaker is tripped - check condensing unit breakers. If the heat pump isn’t working at all but the air handler and blower are working fine, then the device will simply blow cold air from outside or possibly even just recycled cold air from inside. 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. How you’ll know this is your issue: Your furnace blows hot air but that … No. It would be best if you called a professional for a repair. 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. I have a Carrier Tech 2000 heat pump. The customer just thinks the heat pump is blowing cold air. 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. Items in red usually require a service call. Now, what if the heat pump really is blowing cold air? Here’s another possible DIY fix for your heater blowing cold air. 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. 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. Thanks again for all your help!! But, when it’s really cold outside, like a 20 degree day, your heat pump output might drop to 95 or even 85 degrees. Is the air coming from the vents hot or warm? 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). There are other reasons your heat pump could be blowing cold air instead of heat, but those are the basics. 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. The supply vents did start blowing warm air. I picked up a whole housing subdivision of customers because the installation contractor did not hook this up properly. The following is going off the issue of your problem, but it relates to a heat pump blowing cold air. 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. Select HEAT PUMP. You need JavaScript enabled to view this site properly! That causes cold air to blow out of your vents if it is not hooked up properly. Turn the ring and select SETTINGS. Something could be wrong with the compressor. Heat Pump blowing cold air from the outside unit. I swear you will soon find an answer to your problem with your heat pump blowing cold air. 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. He was punctual and made sure to explain his findings for this Preventative Maintenance. It's a statement heating and air conditioning pros hear every winter – "My heat pump is blowing cold air!" I really did my homework while comparing equipment and mechanical contractors. Thanks!! You also have the option to opt-out of these cookies. Your email address will not be published. I suspect, based on what you are telling me, that your problem is directly related to the above list. Hannabery South1342 S. W. End BlvdQuakertown, PA 18951Phone: 215-536-0150, Hannabery Central200 Schantz RoadAllentown, PA 18104Phone: 610-366-9400, Hannabery North100 Northern BlvdClarks Summit, PA 18411Phone: 570-586-1007. In either case, the heat pump isn’t running to heat the air and therefore, you’re getting whatever temperature it … Packed with the latest news, information, tips, special offers, service reminders, and more! That means you have a problem with the refrigeration portion of your heat pump. Maybe the fan is malfunctioning. While there may be a chance the system … In this video we discuss a common question we get in the winter which is: Why is my heat pump not blowing hot air? Heat pumps need to defrost occasionally to prevent ice buildup on the coils. The problem arises when you shift the reversing valve; you are also causing the evaporator coil to get cold. Air – even when it is a defrost method used by many conventional HVAC manufacturers heat pump blows cold air then warm for.... Are also causing the evaporator coil to get cold but not for pumps. Hot for 10 minutes or so, then it blows cold air again an email after the contractor her. Second scenario often happens with new heat pump not heating and, in cold weather, pumps... Which we link of my answer top of the top of the problem these cookies winter they... Has gone bad in the winter, they move heat into the control... With the disconnect box located near the heat pump puts out much cooler air than gas! 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