Whatever it is set to on your heater's control keypad.
When the furnace is operating properly, the air coming out of the vents should typically be between 120°F to 160°F (49°C to 71°C). However, this can vary based on the type of heating system and the specific settings. If the air temperature falls significantly outside this range, it may indicate an issue with the furnace or the heating system. Regular maintenance can help ensure optimal performance and temperature output.
Ultimately, it should be whatever temperature makes you comfortable, but I'd say a normal temperature would be around 65 degrees or so.
55 degrees above zero Fahrenheit
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.
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........
in the floor.
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.
on the floor on the floor
Turning the thermostat to a higher temperature does not make the air coming out of the vents hotter on a central AC with a heat coil. The temperature setting on the thermostat simply tells the system when to stop cooling or heating, but it doesn't affect the actual temperature of the air being produced. The heat coil or furnace is responsible for heating the air, not the thermostat setting.
There is probably a fuel leak somewhere. You should have a professional check it out ASAP. There is a possibility of a fire if left alone.
Yes, if cold air is coming out of the vents while the heat is on, it's advisable to turn off the heating system. This could indicate a malfunction, such as a thermostat issue, a problem with the furnace, or air in the ductwork. It's best to troubleshoot the issue or contact a professional to ensure your heating system operates efficiently and safely.
Heating vents should be placed on or near the floor because heat rises. In rising, it will warm the air of the room. If the heating vent were near the ceiling, the room would stay chilly, even though heat was being poured into it.