Interstate Service Company, Inc.

Brentwood, Maryland 20722
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Our Story

A family owned and operated business, Interstate Service Company was established by James Ashen in 1972. Interstate Service Company (ISC) is a full service heating, ventilation, air conditioning and refrigeration company. We provide installation, service and repair of all types and sizes of commercial and industrial systems. ISC specializes in construction, maintenance, and service contracts.

Given our workforce of approximately fifty (50) fulltime employees, ISC is well positioned to handle all of your HVACR requirements. Employees include highly qualified steamfitters, HVACR technicians, Project Managers, Certified Welders, Apprentices, and a highly motivated team of Administrative Personnel.

As reflected by our high percentage of return business, ISC has been providing the highest quality of service to clients in the Maryland, DC and Virginia area for 40 years. This continued success attests to the quality, capability, and consistency of our work, instilling our owners and general contractors with secure knowledge that their projects are in the hands of one of the most respected contractors in the area.

Our goal at Interstate Service Company, Inc. is to provide you with quality equipment, highly trained service technicians, superior customer service and competitive pricing. We sincerely thank you for your interest in Interstate Service Company, Inc. and look forward to a successful business relationship.

Commercial Services

Operations and Maintenance 
We provide full-service maintenance, with dedicated staff to ensure ongoing system maintenance and quick repair.  Our emergency service team is available 24/7 for our contract customers.

We provide full and partial HVAC system replacement, tenant fit outs, as well as brand new ground-up installations.

Systems Design and Project Management 
We specialize in retrofitting older buildings with new heating and cooling systems. New construction and tenant fit outs.
Commercial Refrigeration
We install and service all types of commercial refrigeration units, including walk-in coolers and freezers, reach-in boxes, and ice machines.

What We Do

Products and Services

Company Information

Year Established:
Labor Affiliation:
Annual Volume:
Not Provided Request
Company Size:
20-49 Employees
Service Sector:
Public Private
Typical Project Size:
From $500,000 to $2
Project Types:
Interior Fit-Ups

Associations & Memberships

Building Trades Assn.
MCAA (Mechanical Contractors Assn. of America)
MCAMW (Mechanical Contractors Assn. of Metro Washington)
MSCA (Mechanical Service Contractors of America)
Steamfitters Local 602
UA (United Assn.)

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