The hot air leaving the furnace would cause very high head pressures on the heat pump On a time temperature defrost control, what determines the amount of time before the defrost cycle starts? The Heat Pump takes the heat from the home and releases it outside in the summer to cool the home. Depending on your heat pump brand and model - thus the heat pump's design - the outdoor unit in heating mode will run a defrost cycle as often as once every 30-35 minutes OR (on some more sophisticated designs) the heat pump may only run a defrost cycle if sensors tell it that the outdoor coil is iced over. 1) Dirty outside unit In heat mode, the heat pump’s outdoor unit uses liquid refrigerant to absorb heat from the air, and then transports that refrigerant inside to heat your home air. Also, does heat pump use outside unit? Does the AC compressor run when the heat is on? Last night it was 10 degrees here in IN. When a technician installs a new heat pump in your home, you’re usually told that it’s an efficient heating and cooling system. Unfortunately this condition could indicate a burned-out A/C or heat pump compressor motor. This is called staging, if you turn the system to emergency heat just the strip heat or … In the heating mode (if it's a heat pump) it could eventually shut off on a … It can be confusing since an outdoor AC unit and an outdoor heat pump look exactly the same. Turn on the heat and check the outside unit Once you feel hot air coming through your vents, walk outside and see if the outdoor unit is running. If you can tolerate most of the summer heat – save for the absolute hottest of days – you'll want to use the AUTO setting. What about the amount of frost on the unit in this photo? When a technician installs a heating and cooling system in a new home, these units are usually entirely separate from one another. Coronavirus Update: We care about your health and continue to service our customers safely. Because your heat pump relies on heating energy from outdoor air, it can be completely normal for a unit to run all the time in extreme temperatures as it tries to extract enough heat for your home. Should the outside unit ever come on when temp is below say freezing? The fan setting controls your AC's blower; A fan inside your system that helps distribute air throughout your home. Heat pumps and air conditioners are different because of the functions they provide. What does the fan setting on the thermostat do. If you have an emergency heat setting, then just the heat strip comes on with the blower. Running the air conditioner will also help clear up window condensation. It is basically an air conditioner in the summer and it’s a heater in the winter. The heated air then moves through the ducts to every room in a home. Conclusion. Most electric heat pumps are significantly more energy efficient when compared to a gas operated furnace. The thermostat reaches the desired temperature, the indoor unit shuts off, the air stops blowing, but the outdoor unit keeps on running. Read More. In the summer, your heat pump might run constantly when your unit is struggling to reach a low set temp during those triple-digit heat waves. What are the names of Santa's 12 reindeers? When this happens, you can easily reset it after locating the circuit breaker panel. -I'll only add this: There are times when the outside fan does run BUT the fan will shut down in defrost mode. The outdoor unit has the compressor and the condensing coil. But if it’s not very hot and your HVAC heat pump is not cooling, you probably need a service call. The fan only turns on when cooling or heating (in winter) is required. For more info including a troubleshooting guide, check out the heat pump page at my source. The outdoor unit † of a heat pump (that metal noisemaker that disturbs the peace on so many otherwise nice summer afternoons) will occasionally grow frost around the outside of the unit when it's in heating mode. If so, how much is OK? When the thermostat reaches your temperature setting, the system, including the blower fan, shuts off. Similarly, you may ask, what does the outside fan do on a heat pump? If it is a heat pump system (which is likely in New Orleans) and the outside unit has a problem, you can heat your house by switching to emergency or supplemental heat on the thermostat. We provide quality service from HVAC technicians who care about the caliber of the work they perform. As the title says, my heat-pump does not run the outside fan when I put it in heating mode, but my vents still blow warm air. If you system is a heat pump and uses a electric or gas furnace then yes sometimes the outdoor unit will run. 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