Do they balance radiators when they fit central heating?

[Fluffycloudland77]

We’ve been here 7 years and despite trv & a wall thermostat it’s either boiling or freezing. There’s no happy medium 🙄.

I’m wondering if it would help.

They do but balancing just affects the rate at which they warm up as it's supposed to be all at the same time. The TRV should switch the flow off at the set point on the TRV. Play around with the timing controller as well as the thermostat and TRVs and you should get the balance about right.
If you want to look at balancing then switch the heating on and rush around the house to find out which ones aren't heating fast enough in keeping with the others and open the valve a bit

do you ever touch the TRVs or the thermostat? You shouldn't. Adjust them and leave.

Small radiators have difficulty maintaining an even temperature. Long low ones, running warm rather than scalding hot, are more comfortable. For your main living room, what size is it, how big are the windows, what size is the radiator?

What temperature is your boiler set to?

Can you photograph your timer and thermostats please?

And an interesting fact about radiator balancing:

You don't do it by opening the cold ones. You do it by turning down the hot ones.

@PigletJohn

And an interesting fact about radiator balancing:

You don't do it by opening the cold ones. You do it by turning down the hot ones.

?! You live and learn :)