It is obvious that comfort standards nowadays are not even similar to those during the construction of the buildings that today present some type of patrimonial protection. Therefore in most of them, there have been thermal systems installed. Great part of these buildings present constructive and aesthetic characteristics that have made it very difficult the installation of complete acclimatization systems, this is way these systems are fundamentally heating ones, acting on the operative temperature, on its dry temperature component or in the mean radiant temperature, without acting simultaneously on other comfort variables such as relative humidity. Additionally, we have tried to minimize the energy expense, while improving the thermal conditions, acting on some of the building enclosures. If we center our attention in properties which opaque closings present some characteristics that have made them worthy of protection: wall paintings, inlays, coffered ceilings, etc. there have been no actions on them, but, in any case, improving the carpentry and window panes. The incorporation of heating systems to these properties usually becomes in production of condensations in the uninsulated enclosures. If we add the eventual increasing of water tightness caused by the improvement of carpentries, condensation problems, both superficial and interstitial, increase and are much more damaging the more worthy of protection and the more sensitive to moisture the closures are. For example wall paintings or wood coatings or any other type of hygroscopic material. The present communication presents the possible measures to adopt in properties with patrimonial protection in which some of these pathologies caused by this type of condensations originate.