Mark L. Letterman

HVAC Contractor · Hartly, Delaware

License number	HM-0000019
Trade	HVAC Contractor
License holder	Mark L. Letterman
Location	1803 Slaughter Station Rd, Hartly, DE 19953
Licensed since	2007
License expires	2026-10-31
Status	Current, Active (as of 2026-08-25)

Verify license HM-0000019 on the official Delaware portal

What this record tells you

Mark L. Letterman holds Delaware license HM-0000019, authorizing work as a hvac contractor — 19 years of continuous licensure. It is one of 7 active hvac contractor licenses in Hartly, so you have local alternatives to compare quotes against. Confirm the current status on the official state portal before signing a contract.

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This page is generated from Delaware public license records for consumer-protection purposes. Mark L. Letterman has not claimed this page, is not a sponsor, and no endorsement is implied. Always re-verify license status and insurance before hiring. Verify a Pro is a service operated by Scion Media, not affiliated with any government agency.