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It will depend on the year, make, model and the outside temperature but on an average day of about 80 degrees it will be in the area of between 39 to 47 degrees on a low-medium speed......
I don't know much about furnaces but in AC units I know both the thermostat and blockage of air vents can cause a constant loop due to poor temp readings.
Heater may be "airbound" and have to be bled
The water being held in the water tank when the furnace shuts off is at a set temp, the water tank hopefully is insulated, as time passes, the water temp has to drop because the furnace has not come on to maintain the set temp, also the controller could be faultly that controls the water temp for the hot water heater, the only time you have hot water is when the furnace runs.
Most cars will not run hot if the radiator is a little low. It sounds like you may have a pin hole in your heater core (coil) and the stem could be coming through your vents. This should have some smell to it. Most cars will not run hot if the radiator is a little low. It sounds like you may have a pin hole in your heater core (coil) and the steam could be coming through your vents. This should have some smell to it.
In temp vs out temp should be about 18 degrees different if running top notch.
I have a 01 Buick and the ac temp that comes out of the vents is around 50 deg - at idle and around 45 deg at highway speed - Is this normal a normal temp? or should the ac temps be colder?
no. if the unit is running the same temp of air comes out just for a longer time
check and replace if needed the heater core that's one reason why no heat
Yes, but if it is not zoned, you will just overheat the area with the other thermostat. Which ever thermostat is in a cooler area will make the warm area of the house warmer then you want it. If you have adjustable vents, just close down the vents in the warmer part of the house or where the thermostat is, and the cooler parts will get more heat because it will run longer to make the thermostat reach temp. Don't close them all the way, just start at half and see if this works, adj as you need or until you get the results you want. If they are not adj, you can either get them or be creative to block some of the heat coming out. I also believe you would have a duel stage furnace also.
go out and buy a 5 dollar temp probe
The normal average AC air temp put out at the AC vents should be in the range of 40 degrees F. This also depends on the outside air temp.