Welcome to P.R. Douglas Co., Inc.

and Formal Oil Co., Inc.


We are a fully licensed and Insured for all Oil and Gas equipment service and installation.

 Service Area:
We service all of Greater Boston!














 Heating, Air Conditioning, and Fuel Oil

Remain comfortable in your home with professional heating and air-conditioning services from our HVAC company in Waltham, Massachusetts. Since 1979, we at P.R. Douglas Co. Inc. and Formal Oil Co. Inc. have been providing our customers with fast, affordable, and efficient HVAC and oil services backed by 100 years' combined experience! We offer gas and oil equipment installations and service, water heater installations, fuel oil delivery, and a one-year warranty program to guarantee our service.