We’ve suspected for a while that our heating system is way over spec since we added loads of insulation to the house, and now the system needs replacing we’ve had it recalculated. And sure enough the numbers say our heat loss on a cold day (rare here) is about half what the current system can put out, so the replacement can be smaller. Definitely don’t regret maxing out the external wall insulation almost a decade ago, it massively changed how warm our 1930s single block house stays
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