DESIGN FLOW HEATING & COOLING LLC

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, 100% are HVAC work.

HVAC 27

Typical job observed: 4 ton systems.

Recent work

• Furnace replacement 60,000 BTU
  August 2026 · Howard County

  Like for Like replacement of 60,000 BTU gas furnace only

• Furnace replacement 2 tons
  July 2026 · Howard County

  Replace existing gas furnace, coil & air conditioner with goodman 60K btuh gas furn m#grvt800603bn, 2 ton heat pump m#g…

• Heat pump install 3 tons
  May 2026 · Howard County

  Replace existing AC/Coil with New Bryant 3 Ton Heat Pump M#248TAN03600A & 3 Ton Coil M#CAAMP3717AMA

• Basement finishing 4 tons
  February 2026 · Howard County

  Replace existing Gas Furnace/AC with new Bryant 4 ton Heat Pump M#248TAN0400A dual fueled with Bryant 100K BTU Propane …

• Sunroom addition
  February 2026 · Howard County

  Replacing ductless system in sunroom with new carrier ductless system- outdoor m#37mahaq18aa3, indoor m#45mbfaq16xa3

• Furnace replacement
  December 2025 · Howard County

  Replace existing gas furnace & air conditioner with new gas furnace, heat pump & coil

• Furnace replacement 4 tons
  July 2025 · Howard County

  Like for like replacement of existing system: installing goodman 4 ton heat pump, 5 ton coil, 80K btuh gas furnace

• Furnace replacement 100,000 BTU
  November 2024 · Howard County

  Replace existing propane gas furnace and A/C with water furnace geothermal 4 ton split system heat pump m#ndz049 & coil…

• Basement finishing
  November 2024 · Howard County

  SFD ALTERATION BASEMENT REMODEL Install Ductless System wall mounted unit in basement office area and two transfer fans…

• HVAC work
  October 2024 · Howard County

  Add new ductless 2 zone system in SFD. daikin ductless equipment: 1 outdoor unit m#3mxl24wmvju9, .5 ton indoor wall mou…

Licensing

• Maryland HVACR Contractor Issued by Maryland Board of Heating, Ventilation, Air Conditioning and Refrigeration. Verify
• Natural Gas Fitter Issued by Maryland Board of Plumbing. Verify

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

• Howard County: 27 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 list DESIGN FLOW HEATING & COOLING LLC under Maryland HVACR Contractor, Natural Gas Fitter. Check current standing with the issuing body before hiring.

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 Howard County