Interviewer instructions
If the household uses supplemental heating system, ask whether they use the supplemental heating frequently or occasionally. If the household uses the supplemental heating system frequently or occasionally, write the code '1' and '2' respectively. In the case, the household doesn't use supplemental heating, write 'No' or the code '3' and skip question 8 of Energy module.
Question post text
If answer is 3 > Go to question 9 of Energy module