I have a victorian stone built house whose upstairs sash windows were welded shut millennia ago and whose chimneys have been blocked up. It's far more unbearably hot upstairs in this weather than downstairs. If I unblocked the chimneys would it help or make more problems? And if so (they still exist, not been plastered over as the ones downstairs) could an ordinary chimneysweep do it or is it complicated?
thanks Jon