HVAC in St. Louis, MO: how do you get written quotes?

For a St. Louis heating or air-conditioning job, request written quotes against one scope.St. Louis averages 1769.3 cooling degree days a year (NOAA normals 1991-2020, St Louis Sci Ctr station).Utility gas heats 66.8% (±0.7 points) of St. Louis's occupied homes (Census ACS 2020-2024).

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: 5 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.

MCP connector URLhttps://instabids.ai/api/agent/mcp
Agent API (OpenAPI)https://instabids.ai/openapi.json
Start-request linkhttps://instabids.ai/intake?trade=ac&from=hire-hvac--mo--st-louis&utm_source=us&utm_medium=page&utm_campaign=hire&page_type=hire&place=st+louis%2C+MO#job=heating%20or%20air-conditioning%20job
Prompt for any AI, with your job

Open it in your assistant

Add InstaBids as a connector

Every page is plain HTML. Steps for every assistant: add to your assistant.

Key facts for hiring an HVAC contractor in St. Louis

NOAA reports 4,291.7 annual heating degree days, base 65F, at ST LOUIS SCI CTR inside St. Louis city, using 1991–2020 normals. These describe weather-related energy demand; ask how the heating design responds to the climate. U.S. Climate Normals (read 2026-10-17).

How do you get written quotes on one scope?

Describe the job once, using the scope checklist below, built from what we found for St. Louis.
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

What should a written HVAC scope in St. Louis list?

The equipment: capacity, efficiency rating and model, in writing
The heating side too: St. Louis'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 St. Louis's homes do
Whether your job is one St. Louis's page quoted below lists, and who applies for the permit if one applies to your job
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 St. Louis?

St. Louis's permit page “Apply for a Mechanical Permit” (read 5 November 2026): “Online applications can be submitted through the contractor’s dashboard once you are logged into your STL City Permits account. Use the Begin Online button below to log in.” Open St. Louis's source page

What license does an HVAC contractor need in St. Louis?

The city Business License Search states: All persons (sole proprietors, partnerships, and corporations) who conduct business in the City of St. Louis, MO must obtain a business license for that activity. This source addresses the city business-licence requirement. Mechanical permit instructions are a separate source for the mechanical work. After you pick an HVAC contractor, you can select Business Name in the city search and use the legal business name. The search describes current-year graduated business licences; it does not establish mechanical credentials. Business License Search (read 2026-11-05).

Missouri license lookup guide

AC repair in St. Louis

For an AC repair request, describe the cooling symptom and whether the scope includes replacement. NOAA reports 1,769.3 annual cooling degree days, base 65F, at ST LOUIS SCI CTR inside St. Louis city, using 1991–2020 normals. This station measure describes the climate rather than the size or condition of your equipment. U.S. Climate Normals (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 St. Louis, MO-IL area, May 2025: $30.29 (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

St. Louis permit page “Apply for a Mechanical Permit”, read 5 November 2026: www.stlouis-mo.gov
stlouis-mo.gov, read 5 November 2026: www.stlouis-mo.gov
BLS Occupational Employment and Wage Statistics (series OEUM004118000000049902108), 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.