Keeping You Comfortable All Year Long!



Located in Dunkirk, Maryland, we serve the District of Columbia, Virginia areas, as well as local Maryland Counties, including but not limited to: Calvert, Charles, St. Mary's, Anne Arundel, Prince George's, Howard, Montgomery, and Queen Anne's. 


Ralph P. Sita, Inc. is a union contractor with personnel trained and supplied by the Steamfitters Local Union #602. Our mechanics have years of experience and are equipped with the most up to date training and tools of the trade. We design, install, and service pneumatic controls, mechanical equipment, heating, air conditioning and ventilation systems, and offer full service, commercial and residential, preventative maintenance service contracts. 

Ralph P. Sita, Inc. is fully licensed and insured in Maryland, Virginia, and the District of Columbia.


Ralph P. Sita, Inc. is also an accredited business with

theBetter Business Bureau (BBB).

Family Owned & Operated For Over 35 Years!

Ralph P. Sita, Inc. is a locally owned and operated, full service, residential, industrial, and commercial heating, ventilation, and air conditioning contractor with over 35 years of experience in the industry. 


CALL US TODAY! 

PHONE: (301) 855-9387

Ventilation 

We've got over 35 years of experience to help you determine how to tackle all of your heating  concerns. Our expert technicians can help you determine the system that will best fit your particular needs. In addition, because we offer a wide range of  exceptional brand named equipment, we are able to offer several, reliable and affordable, heating options.

We've got several options to help with all of your commercial and residential air ventilation needs.

We specialize in custom duct work systems and also offer air duct cleaning to ensure your system is operating as efficient and effective as possible. 

We've got a number of different options to help you with all of your cooling needs. From preventative maintenance services, to repairs and new installations, we've got you covered. Summer is right around the corner! Call to schedule your preventative maintenance service today! 

​Heating

Cooling