Heating is too warm when weather is milder

[slicendice]

I have an Intergas Xclusive 30 which was fitted a couple of years back, along with EvoHome.

Generally I've been pretty pleased with the whole setup, but one thing I've noticed is that if there's a mild spell during winter, it feels like the rooms get a bit too hot/stuffy and I have to tweak the TRVs to drop the temp a bit.

Similarly, if it's super cold outside, the opposite is the case and I have to boost the temp on the TRVs a bit.

It's not really bad or anything like that but I'm just wondering if there's anything that could be done to prevent this, or at least minimise it?

Is it a boiler thing or an EvoHome thing? Would adding an external temperature sensor make any difference?

Thanks...

 

[muggles]

Is Evohome connected via a BDR or an OpenTherm bridge?

 

[slicendice]

Is Evohome connected via a BDR or an OpenTherm bridge?

It's the OpenTherm Bridge (part: R8810A1018)

 

[slicendice]

Something else I've noticed is that the room temperature shown on the TRV is quite different to the temperature shown on an independent thermometer...sometimes by about 5-6 degrees.

Is that normal?