Literal question
4. Services or amenities in the housing unit
Air conditioning (central air conditioning, or mobile appliances, not fans) [] Yes [] No
Heating system
[] Yes, central heating in the building
[] Yes, heating system in the housing unit
[] No, there is no heating system, but there is an appliance that heats one of the rooms (for example: electric radiators)
[] No, there is no heat (skip to question 6)