Can you park next to fire hydrant if the curb is not marked at all ?
Ideal humidity is between 30 and 40%. Any higher than that will make your windows fog up on the inside. I would recommend an stand alone humidifier. You can get a ''console'' type for around a hundred bucks that will do the whole house or a smaller one for one room for about $30 to 40. Attaching one to your furnace is looked down upon by most guys in the know.
b, insulated, there must be an area between the gas or oil and the tank in which it directly sits in. This I believe is because of pressure of fumes or something.
