Once the houesholds are selected they will be randomly assigned to intervention or control groups. During the first winter, all 1400 households will be monitored for temperature and humidity and their comfort, health and healthcare utilization will be recorded. Half the households, assigned to the intervention group, will be fully insulated during the spring. The following winter, all the initial measurements taken from both the intervention and control group will be repeated. At the end of the study period, all control houses will be insulated.