Concrete blocks & weather-side insulation, house built in 1973, roof truss

I am going to renovate a house built in 1973. It was built with concrete blocks. I actually only want to renew the windows and insulate the roof structure. Or does external insulation make sense with concrete blocks? (It is heated with oil and a wood stove) Does it make sense to insulate only the weather-exposed side?

THANK YOU!

....Or does external insulation make sense for concrete blocks? (Heating is done with oil and a wood stove)

If you want to counteract the sharply rising energy prices somewhat, it should make sense.

....Does it make sense to insulate only the weather side?

Hardly. Saving at the wrong end!

best regards