The radiators or the heating surface (not sure what it's called) are not hot, only lukewarm.I googled before I asked for help here and I was thinking it might be the air in the system, but as I am still learning about the whole heating system, I wanted to make sure all the temperature settings are appropriate. Are they?


Maybe, maybe not.

Your terminology was a bit vague. Are you using a recirculating
hot water system which pumps heated water into baseboard heaters?

If that's the case, then...

a: if it's older than 20 or so years (in other words, "dumb"), then
yes, the piping should feel hot.

b: if it's newer and "smart", it will be designed to (in loose
terms) throttle up or down depending on how much heat it
thinks is needed.

In the old days, if the outdoor temperature was (numbers made
up) 50 degrees and you wanted 70, the boiler might only
come on, at _full_ strentgh, for five minutes out of a
half hour. But when it was on, the radiators would be hot.

If it was zero outside, the sytem might be on for 25 minutes
out of each half hour.

Nowadays, there are units that will cut back on their output,
based on the outdoor temperature and other factors.

So taking that 50 degree outside temperature, instead of
the boiler running at full capacity for five minutes/30,
it will cut down to 10 percent output for 25 mins/30.

The advantages here are better efficiency and less thermal
shift in the house.

HOWEVER, that calculation is based on some magical calculations
based on what the different thermo-sensors are reporting.

So... if you have a newer/smarter unit, there are plenty of
other things that could be going wrong.

As the folk in alt.hvac (back when Usenet was a thing) used
to say, probably a good idea to have a licensed and experienced
technician take a look.

--
__________________________________________________ ___
Knowledge may be power, but communications is the key

[to foil spammers, my address has been double rot-13 encoded]