What should I check for humidity and thermal insulation when choosing a house?

Look for signs of damp (musty smells, peeling paint, mould on walls) and ask about insulation, heating and ventilation. Azorean humidity is high, so check window frames, walls and roofs, and consider a professional inspection. Renovation costs for damp and insulation can be significant, so factor them into your offer. Confirm local building rules and available energy-efficiency support with the municipality or a local expert.