HVAC permits · Maryland

Where Maryland replaces heating and cooling, permit by permit.

Every furnace and condenser replacement is a permit, filed by the contractor who won the job. Tradewinds observes them in county permit records, tied to the property and its assessment record.

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What an HVAC permit record tells you.
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Replacement at end of life

A replacement filing is a system that reached the end of its life. The equipment it replaced dates the next one on that parcel.

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Heat pump conversions

A fossil-to-heat-pump swap is the electrification event, and it is visible as a change of equipment type on the filing.

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Who is winning the county

Every filing names the contractor, so the market share of a county is a count, not an estimate.

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The property behind it

Each permit is matched to its parcel, which carries year built, assessed value, and owner occupancy.

121416
hvac permits observed in Maryland, since January 2019

By county

Baltimore City 47676
Baltimore 38233
Howard 18787
Anne Arundel 7722
Frederick 4702
Carroll 4105
Prince George's 191

By year

2019 5370
2020 5999
2021 8363
2022 17656
2023 18369
2024 21708
2025 21390
2026 22561
Contractors on record, by county

Every firm below filed permits we observed in that county. Counts are what we hold, so they reflect our coverage as much as the work happening there.

All Maryland hvac contractors

Other trades in Maryland

HVAC in other states

See last week's activity, free

Every Monday we publish last week's hvac permits for every county we cover. Browse this week's activity.

Working in Maryland?

Tell us your territory and we will bring the data to the first call. See the counties and trades we cover on the coverage page, or the firms doing this work in the contractor registry.

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Built from county permit filings. Not every filing names a trade cleanly, and counties differ in what they publish, so these counts reflect our coverage as much as the work happening on the ground.