HVAC in Baltimore, MD: written quotes on one scope

For HVAC work in Baltimore, the city permit page names HVAC&R system replacement as permit work. NOAA's in-city station records 1,748.7 annual cooling degree days; ask the replacement scope to explain equipment sizing. Building Permits (read 2026-10-22). NOAA Climate Normals (read 2026-10-17).

InstaBids is an AI-run marketplace for homeowners and property managers: describe a home job once, by chat or through your own AI assistant, add photos, and get multiple written quotes on the same scope, compared apples to apples, with no phone calls or home visits before you pick.

By InstaBids editorial team with AI research agents. Sources read: 17 October 2026 Latest source read: 4 November 2026 Updated 2026-11-05

Describe it onceBy chat, or through your own AI assistant, and add photos.
Post it and send itContractors bid in writing on that scope.
Compare line by lineEvery quote is written against the same scope.
You chooseContact details stay hidden until you pick and they confirm.

For your AI assistant

MCP connector · REST API · plain HTML

Hand any of these to your assistant and it can help you write this job's request; you send the request yourself. What you type in the job box above goes into the prompt these buttons carry. The connector asks you to sign in to your InstaBids account the first time.

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Start-request linkhttps://instabids.ai/intake?trade=ac&from=hire-hvac--md--baltimore&utm_source=us&utm_medium=page&utm_campaign=hire&page_type=hire&place=baltimore%2C+MD#job=heating%20or%20air-conditioning%20job
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Key facts for hiring an HVAC contractor in Baltimore

Baltimore's Maryland Science Center station records 3,858.4 annual heating degree days, base 65°F, in NOAA's 1991–2020 normals. NOAA U.S. Climate Normals (read 2026-10-17).
Baltimore City Department of Housing and Community Development publishes the HVAC&R permit work list below. Identify permit responsibility in the written scope. Building Permits (read 2026-10-22).
For installation work, read the Maryland board's master-license description in the license section. After you pick an HVAC contractor, use the board's public query to read the relevant record. Apply for an Original License (read 2026-11-04).

How to get written quotes on one scope

Describe the job once, using the scope checklist below, built from what we found for Baltimore.
Post it on InstaBids and send it.
Every quote is written against the same scope, so they compare line by line.
You choose who gets your number.
Your AI assistant can help you write it: InstaBids works as a connector in Claude and in any MCP client, added by URL with your InstaBids sign-in, and a ChatGPT app is coming. You send the request yourself. Connect an assistant

Your written scope for a heating or air-conditioning job in Baltimore

The equipment: capacity, efficiency rating and model, in writing
The heating side too: Baltimore's heating degree days mean the system heats as well as cools
Gas line and venting checks if the system burns gas, as many of Baltimore's homes do
Who pulls the Baltimore permit for changing, installing or replacing HVAC&R systems, and when the inspection is booked
Removal and disposal of the old parts or materials
Warranty terms on parts and labor, in writing

Do you need a permit for a heating or air-conditioning job in Baltimore?

Baltimore's permit page (read 22 October 2026):

“You need a permit if you are replacing or significantly altering anything on a property, including:”
“Constructing, enlarging, altering, repairing, rehabilitating, demolishing (interior and exterior), or moving any structure”
“Changing, installing, or replacing any electrical, gas, mechanical, or HVAC&R and plumbing systems”
“Changing the use of land or any structure”
“Performing any grading or excavating”
“Hosting specific types of events on private property”

Open Baltimore's source page

What license does an HVAC contractor need in Baltimore?

Maryland's HVACR board describes its Master class as follows (verbatim): Master: A master license entitles the licensee to provide installation and maintenance services in all of the areas of HVACR work. After you pick an HVAC contractor for Baltimore, read that class description against the installation or maintenance work in your scope. Apply for an Original License (read 2026-11-04).

Maryland license lookup guide

Furnace repair in Baltimore

Census ACS 2020–2024 estimates utility gas heats 62.1% of occupied Baltimore city homes, with a 90% margin of error of 0.8 percentage points. Electricity accounts for 31.1%, with a margin of 0.7 points. These citywide shares do not identify the equipment in your home. American Community Survey: House Heating Fuel (read 2026-10-17).

Ask which heat source the quoted equipment will use.

NOAA explains: “The degree day is one measure of the weather related energy demand.” Ask for equipment sized to that climate.

Median hourly wage for Heating, Air Conditioning, and Refrigeration Mechanics and Installers in the Baltimore-Columbia-Towson, MD area, May 2025: $30.38 (U.S. Bureau of Labor Statistics, Occupational Employment and Wage Statistics).

This is what workers in this occupation are paid per hour. It is not what a contractor charges for a job.

How does InstaBids work?

InstaBids does not hold payment for the work; you pay the contractor directly on the terms of the bid you accepted.

How is InstaBids different?

Each bidder appears under a stable label such as Contractor A, so you judge the work, not the brand.

Contact details stay hidden until the homeowner picks a contractor and they confirm the connection.

The contact-detail filter can miss disguised contact details.

Sources for the facts on this page

Baltimore permit page, read 22 October 2026: www.baltimorecity.gov
labor.md.gov, read 4 November 2026: labor.md.gov
BLS Occupational Employment and Wage Statistics (series OEUM001258000000049902108), May 2025, read 17 October 2026: api.bls.gov
NOAA NCEI U.S. Climate Normals 1991-2020, read 17 October 2026: www.ncei.noaa.gov
U.S. Census Bureau, American Community Survey 5-year (B25040), ACS 5-year 2020-2024, read 17 October 2026: api.census.gov
NOAA CPC degree-day definition, read 3 November 2026: www.cpc.ncep.noaa.gov

This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.