Strange way to do it, I would have done it this way:
id - id field with auto increment
description - varchar field describing the item
aircon - tinyint field
parking - tinyint field
pool - tinyint field
heating - tinyint field
gas - tinyint field
that way you'd end up with the table looking like this:
id desc aircon park pool heat gas
1 item 1 1 1 1 0 0
2 item 2 0 1 0 0 0
3 item 3 1 1 0 0 0
And with checkboxes the value is only passed back from the form if it's checked (ticked) if it's not ticked then it's not passed. With the way your doing it would be a nightmare to edit the record.
My way is easier as you just have to check if the value is 1 if it is set the checked property to checked and the item will be ticked when you edit the record.