DUKE HEINTZELMAN

Permits are pulled before work begins and then inspected by the county. A contractor who files them is working inside a system with an inspector in it, which is what unpermitted work avoids.

What the permits show

Of the permits we observed, 92% are HVAC work.

HVAC 95

Plumbing 4

Accessory Structure 3

Electrical 1

Typical job observed: 20 amp service.

Recent work

• Water heater replacement
  April 2025 · Frederick County

  Replace 50 gallon NG water heater with same

• Gas water heater replacement
  April 2025 · Frederick County

  Replace gas water heater with same.

• Accessory structure install
  March 2025 · Frederick County

  Install a vehicle charger located in the garage.Charging pedestals are not allowed to be constructed in the right of wa…

• Electrical replacement
  March 2025 · Frederick County

  Replace meter can only per Potomac Edison. DR # 772836751

• Furnace replacement
  February 2025 · Frederick County

  Replace gas (LP) furnace with same. Direct vent

• Accessory structure install 60 amps
  January 2025 · Frederick County

  Install a 60 amp circuit for a 48 amp vehicle charger located in the garage.

• Plumbing replacement
  October 2024 · Frederick County

  Replace water service with new.

• HVAC replacement
  July 2024 · Frederick County

  Replace circuit to air handler.

• Heat pump install
  June 2024 · Frederick County

  Replace heat pump system with same. Relocating heat pump. Install GFCI.

Licensing

Frederick County does not publish license records with its permit data, so none appear here. That is a gap in the county's published data, not a statement about this contractor.

Towns we observed them working in

We hold permit records for Anne Arundel County, Baltimore City, Baltimore County, Carroll County, Frederick County, Howard County, Prince George's County, and Washington DC. Work anywhere else is not missing from this contractor's record, it is outside what we cover.

Permits by year

Our records for this contractor's counties begin August 2021. Years before that are not shown because we hold nothing for them, not because nothing happened.

What this page is, and is not

• Frederick County: 103 permits observed, from records beginning August 2021.

This page shows permits we observed in county records. Our observation is not complete: work done before those dates, in counties we do not cover, or on filings that name no contractor does not appear here. A contractor's real work is almost always greater than what we observed, and absence of a permit on this page does not mean the work was not done or not permitted. We currently hold records for Anne Arundel County, Baltimore City, Baltimore County, Carroll County, Frederick County, Howard County, Prince George's County, and Washington DC; see permit coverage for what that includes.

Common questions

Does a permit record mean this contractor is licensed?

County permit records here do not list a license type for this contractor. That does not mean the contractor is unlicensed; not every county publishes license data with its permits.

Why do some contractors show more permits than others?

Counties began publishing at different times and describe contractors differently, so the number reflects what we observed as much as what the contractor did. It is not a ranking.

What should I still ask for?

Proof of insurance, a written contract, and the license number for the trade being performed. A permit record is a starting point, not a substitute for either.

Other HVAC contractors in Frederick County