The cold air blowing in your home is not good and the problems can vary. A: Troubleshooting Furnaces Not Blowing Hot Air. Before you dial your air conditioner service, take a pause.You may be able to handle the issue yourself… The good news is part of the system is working or it would be blowing air at all. With a heater blowing cold air, the first question I’d ask someone is if cold air is blowing from their furnace right after they turn their heat on. If not, your system may have a valve problem, a refrigerant charge issue, or a compressor problem. Not by a long shot! The system is running, but the air is not … WHY IS THE FAN ON MY HEAT PUMP NOT RUNNING? 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). Your heat pump heats your home by drawing in warmth from the air outside and blowing it into your home. Consider the air ducts. I honestly don’t mean this to be insulting, but you’d be surprised at how many times people are shocked to learn that neither your air conditioning nor your heater will be cold or hot right after you turn them on. A heat pump blowing mild air—on the cool side in the winter and on the lukewarm side in the summer— doesn’t always mean something is seriously wrong with your system. Items in red usually require a service call. Instead, your furnace supplies a steady stream of warm air to regulate your home’s temperature. Jump To Section: Intro: How Furnaces Should Work. Is your furnace blowing hot air in some rooms but not in others? You wouldn’t be the first homeowner to overlook this obvious one. Lack of power or a confusion in the mechanics is your problem here. Others require help from an experienced HVAC professional. On many other thermostats, the O wire is typically connected to a terminal marked W on one side and O or O/B on the other side; the W is for use with a conventional system (furnace) while O/B is for use with a heat pump. Heat Pump Not Blowing Hot Air: Is My Heat Pump Not Working? If the thermostat is still set to Heat or Fan-only mode, you’ll have a heat pump blowing hot air – or air that is warm at best. Heat pumps actually blow air that is warm but feels cold to us. Heat pumps take this process and crank it into overdrive, extracting heat from cool and even cold air. 5. Most homes use air-source heat pumps, which run outside air through a series of coils that extract heat energy. If your furnace is improperly fitted for your home then that can be the cause of your cold air. Share this conversation. Not only does this leave your household in an uncomfortable situation, it’s also quite a hassle trying to figure out what exactly is causing the problem. Does it seem like the airflow is weaker than you remember? I have a house in Arizona that's 40 years old. Heat pump not blowing hot air. ... It’s Just Been Switched On – Any furnace will blow cold air when it starts up, since it takes time for hot air to travel through the system and into your home. Show More. Ask Your Own HVAC Question. My concerns are firstly the heating not blowing hot air.This will bug me and I will,like with the wiper problem it also has,have me wanting to fix it immediately. 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). The heat pump is a Lennox HP13-036 installed Aug 2006. It is common for air from a heat pump to feel lukewarm or even cool at times but this air is, in fact, heated air that will allow you to keep your home warm and comfortable. I'm guessing low Freon but what are some checks I can do for the thermostat wiring or unit before I have to call a tech. Below is a list of possible causes. It has gotten quite cold here the last few days and I turned the thermostat to heat for the first time this fall. A heat pump’s refrigerant is another crucial part of its system. Installed a nest thermostat in the winter. Pretty sure it's right tho. Set the thermostat at least 5 degrees higher than the current temperature and go check the registers/vents to see if you can feel warm air coming out. Problems with your vents or ductwork are likely to blame. Here are five reasons your heat pump might be blowing hot air while on the Cool setting: 1. Your heat pump may also have old or worn-out wiring that needs to be repaired or tightened by a Trane Comfort Specialist™. Hi, My heat pump is blowing hot air even though the thermostat is set for cool. Heat pump check #1: Is your heat pump providing any heat at all? Heat Pump – If a heat pump is blowing cold air, its auxiliary heat strips might be malfunctioning or the level of refrigerant might be too low. The substance that facilitates this process is called refrigerant. Incorrect Thermostat Settings.