Don't forget heat recovery ventilation. The house I bought used originally a wood furnace which created a good draft of fresh air from the walls by sucking the

Don't forget heat recovery ventilation. The house I bought used originally a wood furnace which created a good draft of fresh air from the walls by sucking the ambient air into the chimney. Once the furnace had been replaced by an electric system (first radiator then heat pump), the air became stale in the house, causing all sorts of incomfort and humidity issues.