HVAC Companies in Dayton, MD - Shamrock Service Co., Inc. has been offering expert heating and cooling system installation and service for residential and commercial customers in the Dayton area. Our HVAC technicians can handle all your heating and cooling needs in Dayton, MD and the surrounding area. Our reputation is solid and we look forward to developing a long lasting relationship. Call air conditioning and Heating Services for HVAC in Dayton, Maryland.