Oil Type vs Dry Type Transformer

Oil costs US$87.95 a barrel and the air is free (so far).

As far as the 'consequences' are concerned, please do a Google search on transformers.

Type of building:

As per Indian Electricity Rules use of dry type transformer is mandetory in residential and commercial buildings.

Maintenance & Safety:

Losses of dry type transformer are more compared to oil type, however dry type transformer is safer and has low maintenance.

Cost:

Cost wise oil type transformers are affordable.