I suppose it would be nice to have a heating/cooling system in the house. Some examples:
Primary Heating System
Secondary Heating System
Tertiary Heating System
Examples would be:
Gas forced air
Solar hot water
Wood stove
You'd do the same with cooling systems as well.
Do you guys think this would be useful? Perhaps just leaving it as an text field would be fine instead of a drop down? Drop downs are better for searches, but they don't always have everything in them.
More feedback.