If a thermostat is set incorrectly, you might notice your furnace blowing cold air from the heat registers, a lower than expected temperature reading on the thermostat, or you may even hear your air conditioner running outside. Sometime today, upstairs unit stopped blowing cold air. Items in red usually require a service call. Will a badly worn impeller on the water pump be my problem. Both units were made in '95 and installed a year later. Hi, my heater is blowing cold air upstairs...The downstairs works fine...When I put both thermostat on and went up to check them, the one working had gas burning and the one did not. People’s comfort level where indoor temperature is concerned can vary. Your furnace may be blowing cold air because the filter is too dirty. The dirty air filter will block airflow, causing the furnace to run longer to heat your home until it overheats. For example, if you have your thermostat set on the ”on” position instead of “auto”, the furnace will continually run, even if it isn’t on the heat cycle,. The heat is coming out of the vents in the living room and kitchen, but my infant's rooms and my room are freezing. It will happen even if the heater core is functioning. hi I have a lennox cb28-uh-036-230-02, two systems running, one for downstairs and one for upstairs. Now, that may be hard to grasp, but this is the way it works. Basically, the furnace isn’t lighting the fuel, meaning it can’t heat your home, either. To protect the outdoor coils from freezing up in the winter, heat pumps go through a defrosting period every hour or so in which they are truly blowing out cold air. My upstairs doesn’t cool well. This too can cause your heater to blow cold air. Don’t worry: we’ve outlined some of the most common causes of the problem below. 2. Have an expert inspect your ducts along with the furnace. That outside air in the mix lowers the temperature of the air that’s just come from your furnace. Make sure your thermostat is set to HEAT and your fan is set to AUTO. In the upstairs area of homes, air sealing vulnerable areas to prevent cold air from getting through helps tremendously in keeping the upstairs warm during winter months. The resulting depressurization could cause a big backdraft. Below are some reasons you may be getting a blast of chilly air and how you can warm up your house as soon 1as possible. In the summer, your indoor coil is cold (and pulls humidity out of the air, and comes in the form of water) which is drained from that PVC pipe located on your roof, or side of your house. Compromised flame sensor. The reason for this, is that in the cooling mode, the outdoor coil actually becomes hot. It’s also the reason that a plugged heater core, stuck thermostat, or air in the cooling system can all cause a car’s heater to blow cold. Your System Was Just Turned On. Leaking Air Ducts – If the ducts connected to your second floor are leaking cold air, then of course your upstairs will not be cold. Downstairs is relatively toasty (we keep the heat at 65) and it feels like summer if you stand under one of the vents when it's blowing. I have central gas air and my downstairs is working, blowing heat, whereas the upstairs stopped working. At one time I thought about making a fan in a tube to take cold air … This might sound crazy, but a heat pump can be working just fine even if the air feels cold. Well this could be caused by several things. Even if you have a gas furnace, they typically have an electric starter that ignites the gas burner. So Why Is My Furnace Blowing Cold Air Instead Of Heat? If you live in the Jacksonville area, you should contact a heating and AC Jacksonville specialist , like Snyder Heating & Air, to determine whether you need to air seal your home. This first solution is to add an additional air conditioner / heater, thermostat and modify the duct work system. In other words, it's not putting out any heat at all. When overheating, your furnace can trip a high limit switch , causing the furnace burners to shut off so that the heat exchanger does not crack. A stuck bend door means the air does not get into the core to turn hot. If you have ruled out number 1 and number 2 on the list, the next thing you want to consider is checking to see if you have a thermostat problem. At one time I thought about making a fan in a tube to take cold air from the upstairs … Routine maintenance could have prevented this call from ever happening. If your heat pump has iced over or if drifting snow has covered up the unit, this can cause a malfunction. Solution: Set the heater to its maximum setting, remove the coolant tank cap and fill it to the proper level. Unfortunately, these are issues that will need to be remedied by a professional. It could even be running in the air conditioning mode due to a malfunction. Does your thermostat have a setting that says "Fan"? Does your thermostat have a setting that says "Fan"? The flame sensor tells your gas heating unit to turn on and warm the air that is cycling through. 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. Because of the missing insulation, warm air leaks and cold air comes in. Check the heater core or the bend door. Charlotte,NC 28214 11. If your furnace seems to be blowing cold air, it could be a problem with the ignition system. Are you Hot Upstairs, Cold Downstairs? Helpful. This is the reason that it takes a while for heaters to start blowing warm air. Let us explain… The air could be warm but still feel cool. Before we help you diagnose the problem, let’s make sure there is actually a problem. The pump is not leaking or making noise. on Jun 14, 2017. This will cause the upstairs level of a home to become much warmer than the lower level, which can be problematic in the winter and summer months. 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. Heat pumps that blow cold air is not as common a problem, yet it does happen, and can be caused by one or more factors. Solution: Change the air filter and see if your furnace starts only blowing warm air. If your central heating system is blowing out cold air, you'll have to follow these steps to repair it. The fan works when turned on but only blows cold air. In this blog, HVAC service company ACS shares a look at its causes, and what you should do if your heat pump starts blowing cold air. As the frost builds up on the outdoor coil, it could potentially inhibit the ability for air to flow across that coil. Helpful. Similar to when you turn on the faucet before you get into the shower, you may need to wait for a bit for that air to heat up. Warm air rises. Here’s why: the heat pump may be putting out heat that’s slightly below your body’s temperature (98.6 degrees F, just FYI). Don't know brand or if it is a heatpump - think it may be since it is one unit supplying AC and heat. If this doesn’t happen after 10 minutes, then you are looking at another issue. Arizona Trane Fall Air Conditioning Promotion 2020 - Up to $600 in Instant Trane Rebates, Finding a home efficiency auditor: the questions to ask, how to tell if your unit is a heat pump or air conditioner. If you see frost on the outdoor coil, it is natural to the process and it is not a sign of any kind of malfunction- the reason the coil is cold falls back to the second law of thermodynamics- which states that energy always moves from areas of higher concentration to areas of lower concentration. In a two-story home it can be difficult to balance the temperatures between the upstairs and downstairs. The reason the fan shuts off during this process is so the system doesn't pull the cold air from the outside across the coil while the hot refrigerant circulates. Next, if your thermostat runs on batteries, check those to make sure they are not week or dead. As air gets hotter, it becomes less dense and rises. If your furnace starts blowing warm but then quickly turns cold, the flame sensor may need attention. 6805 Craig Street Hopefully, being patient will pay off and your heater will soon be sending warm cozy air throughout your home. Is your furnace blowing cold air or not turning on? Or the gas line isn’t supplying enough gas to your furnace. So, here are 3 possible solutions. If the furnace is cold, it cannot heat the air being propelled outside. 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