Automobiles:
COLD TO HOT or if you want to be technical between 62+- to 92 +- Fahrenheit on average. if its too cold the heater obviously isn't working, but may I suggest first looking at your heater controls to ensure the temperature dial is set to warm (THE RED PART OF THE CONTROL)
Homes:
When trying to cool a typical house, the average central AC will only decrease the temperature by about 20 degrees. For example, when it is 100 degrees outside, the inside will typically cool to about 80 at best. However, in order to achieve the 80 degrees inside, the air coming out of the vent should be 45-55 degrees.
The temperature coming directly out of the vent is different than the ambient temperature of the house. The air coming directly from the vent should be 45-55, however this will not be the temperature in your home.
If using a thermometer stuck in the vent, and the blower fan on a medium speed, in the full cold position with AC on vent, temperatures should be between 40-50 degrees F. In the full heat position vent temps should be at least 140 degrees F.
On the vents closest to the main unit it should read around the same temperature that the thermostat is set to after its been running and then as the venting increases the temperature should be less, between 2 to 10 degrees different depending on how well the ducting is in the attic........
Whatever it is set to on your heater's control keypad.
normally 15to 20 degree split between return air and discharge..
Yes
Heating vents should be located near the floor since hot air rises. If the heating vents are located near the ceiling the heat would stay there and not warm the room.
Depends on the ambient air temperature, humidity level, and type of refrigerant used.
Depending on the year, make, model along with if it has single or dual a/c systems and what the outside temperature is, it can be between 36 to 48 degrees...... Simply, the A/C vents temperature should be whatever you set the thermostat as.
55 degrees above zero Fahrenheit
It is temperature control. Your car is wanting to breath or create a constant flow of air and will adjust itself with heat/cool or outside air. You should have an option to go manual and override its desire.
the vents work because of the heat which can make the hot air balloon go up
the vents work because of the heat which can make the hot air balloon go up
It depends on what your heat source is. An electric or petroleum fired forced air furnace will blow high volumes of air that is much hotter than 72 degrees Fahrenheit (perhaps as high as 90-100 degrees) for short periods of time. A heat pump, however, will generally blow air that is nearer the set temperature at lower volumes and for longer periods of time.