Diversified HVAC Services, Inc.

5 (1)

Gaithersburg, Maryland 20879
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Our Story

Diversified HVAC Services, Inc. provides outstanding commercial and residential HVAC/R (heating, ventilating, air conditioning, and refrigeration) services and quality products to the greater Washington, DC and Baltimore Metro areas, including Maryland and Virginia.

Diversified HVAC Services, Inc. was started on April 1, 1990 with a total staff of two people, C. E. Mullaney III and B. E. Dawes, each owning 50% of the company. Their goal was to become self-employed with adequate income, growth, and future security by the sale of service and installation in all areas of the HVAC/R business. Mr. Dawes left the company in August 1997 while Mr. Mullaney kept the company runnng. Mr. Mullaney started in the HVAC business in 1965 in an entry-level position and progressed to senior mechanic, then into supervision, engineering, sales, ownership and operations manager of a large company, and finally into ownership of this company.

In February 2007, the day to day operations of the company were taken over by Chuck Mullaney IV along with service management of field operations being assumed by Andre’ Charron. Chuck IV has been in the HVAC business since 1990 when he started as a helper with Diversified. Andre started his HVAC career in 1995 after leaving the US Naval service and then attending HVAC trade school. He joined Diversified in October of 1997 after meeting Chuck IV at the Air Conditioning Contractors of America (ACCA) Apprenticeship program. Together with Chuck III, they hope to continue the success of Diversified HVAC Services, Inc. while applying the principles that have made this company a success from day one.

It is Diversified’s continuing goal to provide it’s customers with the best, reliable, honest, quality, and fairly priced product possible, and to provide it’s employees long-term employment with fair income, job security, growth, and training with as many benefits as possible

What We Do

Products and Services

Blue Book Network Classifications

We can be found under the following Blue Book Network Classifications.
Mechanical Contractors
Heating Contractors
Air Conditioning Contractors
Cooling Towers

Commercial Construction Project Specializations

Animal Hospital / Kennel
Apartments & Condominiums
Assisted Living
Auto Dealership / Service
Church / Synagogue
City / Town Hall
Club House / Community Center
Court House
Data Centers - Mission Critical
Design Build
Education (K-12)
Fire / Police Station
Fitness Center
Gas Station
Golf Course
Hospital / Nursing Home
Hotel / Motel
Industrial Maintenance
Jail / Prison
Manufacturing Plant
Medical Office
Mixed Use
Non-Residential Building
Office Building
Parking Garage
Post Office
Radio / Television Station
Renewable Energy
Retail Store
School / College / University
Sewage / Water Treatment Plant
Single Family Residential
Storage Facility / Warehouse
Swimming Pool
Terminal - Airport / Bus / Railroad
Theme Park

Company Information

Year Established:
Labor Affiliation:
Annual Volume:
$3 million - $6 million
Avg Contract Amount:
LEED Experience:
Not Provided Request
BIM Experience:
Not Provided Request
Number of Employees:
Not Provided Request
ProView Type:
Service Sector:
Public Private
Typical Project Size:
Up to $1,000,000
Project Types:
Not Provided Request

Diversity Classification

Minority Business Enterprise

Associations & Memberships

ACCA (Air Conditioning Contractors of America)

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