Burkholder’s did an oil-to-propane conversion for us. The estimator came out within a week. He gave us some good ideas we had not thought of. Had an estimate that night. The price was very reasonable and didn’t try to sell us any unnecessary add-ons. We really like our new quiet and efficient unit. Everyone from Burkholder’s was professional and competent. I used them because of references from 3 friends. They also had the 5-star treatment.