Ainsworth Inc. (Cat. 11)

Allied Mechanical & Electrical (Cat. 9)

Ames Construction, Inc. (Cat. 11)

Bortner Bros., Inc. (Cat. 10)

Brubaker, Inc. (Cat. 10)

C Mechanical Services (Cat. 10)

CB Construction Services, Inc. (Cat. 7)

Central Penn Electric, LLC / CPEC, LLC (Cat. 4)

CLARK, Inc. (Cat. 8)

CMC, Inc. (Cat. 10)

E.H. Gochnauer & Sons, Inc. (Cat. 7)

Elite Plumbing Heating & AC, LLC (Cat. 7)

Flow Mechanical, LLC (Cat. 7)

Frey Lutz Corp. (Cat. 11)

Garden Spot Mechanical, Inc. (Cat. 9)

Garrett Electric, Heating & Air (Cat. 4)

George D. Boyer & Sons, Inc. (Cat. 8)

Goodco Mechanical, Inc. (Cat. 8)

Groff's Heating, A/C & Plbg., Inc. (Cat. 10)

H.B. McClure (Cat. 14)