When buildings formerly reliant on oil-burning boilers opt to transition to natural gas, Yadavian engineers necessitate a load letter. Furthermore, the gas utility will require all invoiced oil bills from the past two years. As a professional engineering firm, Yadavian engineers will estimate the gas load requirements following a thorough plan review or detailed site survey. Any building owner seeking to switch from oil to natural gas should engage a licensed professional to assess the associated conversion expenses before initiating a request for new gas service along with the requisite gas load letter.