Heat pumps usually produce air that is 85-92°F. This is plenty warm to heat your home to your desired 72°F. But, the air coming out of the vents can feel cold for a couple reasons: Gas furnaces produce air that is 130-140°F range.
What Should The Output Temperature From A Heat Pump Be? The average output temperature of air source heat pumps is 85-92°F (29-33°C). However, the model, age, condition, and unit type determine the actual temperature.
The thing about heat pumps is that the air coming out of the vents doesn't feel warm like a forced air gas furnace does. The temperature differential is much smaller with a heat pump so the air doesn't feel as warm and it may take longer to heat the house up if it gets too cold.
The temperature coming out of the vents typically is around 80-85 degrees. On a day with highs in the 50s it can take from 6am to noon to get the house from 63 degrees to 66.
The old-timers who trained me would say that the discharge temp will be “about 100 degrees over outdoor ambient” when a properly functioning heat pump system is running in heat mode. That rule of thumb is actually pretty close, but it isn't exact—and what happens if you get a different reading?
Simply put, it means you should never set your thermostat for a temperature more than 20 degrees cooler than the outside air. Why not? Most air conditioning systems can only handle a 20-degree difference between the outside and inside air temperatures.
If there are zones calling for heating and the economizer is working properly, then the set point can be increased. Are set points too high or too low; discharge-air temperature too warm or too cold? Typically, the discharge-air set point should never be lower than 55oF or higher than 70oF.
Gas furnaces produce air that is 130-140°F range. So 85-92°F feels cold to new heat pump owners. Your body temperature is around 98.6°F (everyone's body temperature is slightly different, but that's the average). Since heat pumps produce air that's below that, it can feel cold to you.
Heat pump – Again, assuming proper installation, the supply air coming off the coil of a heat pump will usually be between 90 °F (32 °C) and 110 °F (42 °C). That photo above shows that the temperature of the air coming out of my heat pump was 105 °F (40 °C) when I took the reading.
Now, from the example above, with 75 degree air being pulled in at the air filter, what temperature should we expect to be blowing out? Well, the general consensus is somewhere between 14 to 20 degrees colder than the intake temperature. From my example, 55 to 61 degrees would be an acceptable range.
If your heat pump is on but not blowing hot air, it could be due to a dirty air filter, low refrigerant levels, or a malfunctioning thermostat. The outdoor unit may also be iced over, or the reversing valve may not be working properly. Contact a professional for further inspection.
Consistent and Adequate Temperature Control: A well-functioning heat pump should maintain a consistent temperature throughout your home, as you have set it on the thermostat. If your heat pump struggles to reach or maintain the desired temperature, it could indicate that the system is not working efficiently.
If your air conditioning unit is ac blowing cold air outside, it might mean there's a problem with cooling the air inside. This could be due to refrigerant leaks, frozen coils, electrical issues, or airflow problems. It's important to find out why to fix it and keep the cold air inside.
Heat pumps do not operate as efficiently when temperatures drop to between 25 and 40 degrees Fahrenheit for most systems. A heat pump works best when the temperature is above 40. Once outdoor temperatures drop to 40 degrees, heat pumps start losing efficiency, and they consume more energy to do their jobs.
There could be a refrigerant leak, or the reverse valve is malfunctioning. Either issue prevents the unit from blowing warm air in heating mode, requiring immediate attention from an HVAC technician. Heat pumps provide warm and cold air, which enables them to enter defrost mode.
Ideally, a heat pump should send hot water to your radiators at between 35 and 45 degrees to be most cost effective. Compare this to fossil fuel boilers, which are designed to send water to your radiators at up to 75 degrees. You can still heat your home effectively even at these lower temperatures.
Common signs of dirty air filters include long heating cycles and overheating issues. The average overheating issue will cause your heater to blow cold air throughout your home. To restore the flow of warm air in your house, we recommend replacing the contaminated air filter with a new one.
Ideally, there should be a temperature differential of around 14° to 20° Fahrenheit between the incoming air and the air being blown out by your air conditioner. This means that if the air entering the system is 75°F, the air coming out of the vent should be between 55°F and 61°F.
Know your temperatures
There is a middle point that'll help you with both. Set your heat pump temperature to 18 degrees or above to help fight damp and mould, but below 21 degrees to save on power. The higher the temperature, the more energy the heat pump will use, so anywhere between 18 and 21 is the sweet spot.
A problem in the heat pump itself that might be responsible is dirt and grime along either the indoor or outdoor coils, which will restrict heat exchange. Also check the outdoor cabinet to make sure there isn't snow banked up against it, which will make it hard for the heat pump to draw sufficient outdoor air.
Heat pumps are designed to run continuously. A good starting temperature to set is 68 degrees Fahrenheit.
Optimal Heat Pump Settings for Summer
During the summer months, the ideal setting for your heat pump is around 78 degrees Fahrenheit (25.5 degrees Celsius) according to the US Department of Energy. This setting allows the heat pump to efficiently cool your home while reducing humidity and energy consumption.
The most widely quoted rule of thumb is the 100˚ – 110˚ over ambient discharge rule. This guideline states that a properly charged unit will have a discharge line temperature of 100˚ – 110˚ above the outdoor temperature.
That will depend. If the AC system is operating correctly, then the air coming out of your vent should be about twenty degrees cooler than the regular temperature inside. So, if you're cooling it and the house is 80 degrees, then you would ideally want the air to be about 60 degrees.
On average, an air conditioner running in good condition should take about 15-20 minutes to drop the temperature by 1 degree in a standard-sized room. However, factors like outside temperature, unit size, and insulation quality can affect this timing.