NAICS 423730 Quarterly Industry Report
Warm Air Heating and Air-Conditioning Equipment and Supplies Merchant
Comprehensive industry research for valuation professionals, business owners, buyers, and lenders
NAICS Code: 423730Sector: Wholesale Trade (42)Updated: Q1 2026
About This Report
This Fair Market Value industry report for NAICS 423730 draws on data from the U.S. Census Bureau[5] economic profiles, Bureau of Labor Statistics[6] employment surveys, and SBA size standard publications[7]. Our research team tracks HVAC equipment shipments, residential and commercial construction activity, and energy efficiency regulatory changes to provide valuation context for HVAC wholesale operations. Updated quarterly, each data point is sourced to its originating federal or institutional database.
Industry Snapshot
Key metrics for the warm air heating and air-conditioning equipment and supplies merchant industry.
Industry Definition & Overview
Warm Air Heating and Air-Conditioning Equipment and Supplies Merchant Wholesalers (NAICS 423730) encompasses establishments primarily engaged in the merchant wholesale distribution of warm air heating and air-conditioning equipment and supplies. Product categories include central heating furnaces, air conditioning condensing units, heat pumps, air handlers, ductwork, thermostats, air filtration equipment, humidifiers, and HVAC controls. These distributors purchase from manufacturers and resell to HVAC contractors, mechanical contractors, and building equipment installers.
The HVAC wholesale distribution channel is branch-intensive, with local product availability and technical support driving competitive advantage. Contractors need equipment and parts quickly to keep residential and commercial installation and repair schedules on track. According to the U.S. Census Bureau[5], about 2,090 businesses operated in this industry across approximately 6,216 locations. The multi-location branch model reflects the need for geographic proximity to contractor customer bases.
Plumbing and hydronic heating equipment falls under NAICS 423720, and refrigeration equipment is classified under NAICS 423740. HVAC distributors increasingly carry mini-split ductless systems, heat pump water heaters, and indoor air quality products as energy efficiency codes and consumer demand drive product mix changes. Many distributors operate training centers where contractors learn to install and service new equipment platforms, building brand loyalty and ensuring proper installation quality across their dealer networks.
What's Included in This Industry
- Central heating furnace wholesale distribution
- Air conditioning condensing unit wholesale operations
- Heat pump wholesale distribution
- Air handler and coil wholesale operations
- Ductwork and HVAC sheet metal wholesale distribution
- Thermostat and HVAC control wholesale operations
- Air filtration equipment wholesale distribution
- Mini-split ductless system wholesale operations
- HVAC refrigerant and supply wholesale distribution
- Ventilation equipment wholesale operations
NAICS Classification Hierarchy
| Level | Description | Code |
|---|---|---|
| Sector | Wholesale Trade | 42 |
| Subsector | Merchant Wholesalers, Durable Goods | 423 |
| Industry Group | Hardware, and Plumbing and Heating Equipment and Supplies Merchant Wholesalers | 4237 |
| NAICS Industry | Warm Air Heating and Air-Conditioning Equipment and Supplies Merchant Wholesalers | 42373 |
| National Industry | Warm Air Heating and Air-Conditioning Equipment and Supplies Merchant Wholesalers | 423730 |
Related NAICS Codes
| Code | Description | Relationship |
|---|---|---|
| 423720 | Plumbing and Heating Equipment and Supplies (Hydronics) Merchant Wholesalers | Plumbing and heating equipment merchant wholesalers distribute plumbing fixtures and hydronic heating systems rather than the warm air HVAC equipment here |
| 423740 | Refrigeration Equipment and Supplies Merchant Wholesalers | Refrigeration equipment merchant wholesalers distribute commercial cooling systems classified separately from the air-conditioning equipment covered here |
| 423710 | Hardware Merchant Wholesalers | Hardware merchant wholesalers distribute general hardware items through parallel wholesale channels that serve some of the same contractor customers |
| 333413 | Industrial and Commercial Fan and Blower and Air Purification Equipment Manufacturing | Industrial and commercial fan and blower manufacturing produces ventilation equipment distributed through HVAC wholesale channels to contractors |
| 333415 | Air-Conditioning and Warm Air Heating Equipment and Commercial and Industrial Refrigeration Equipment Manufacturing | Air-conditioning and warm air heating equipment manufacturing produces the systems distributed through HVAC wholesale networks to installing contractors |
Geographic Concentration
Top states by share of national establishments.
| # | State | % Est. | Total Est. |
|---|---|---|---|
| 1 | Texas | 10.8% | 692 |
| 2 | Florida | 8.1% | 522 |
| 3 | California | 7.3% | 467 |
| 4 | Pennsylvania | 4.4% | 281 |
| 5 | New York | 4.3% | 276 |
| 6 | North Carolina | 3.8% | 241 |
| 7 | Illinois | 3.7% | 240 |
| 8 | Ohio | 3.7% | 239 |
| 9 | Michigan | 3.3% | 210 |
| 10 | Virginia | 3.2% | 205 |
% Of Establishments
0%
11%
Source: County Business Patterns, U.S. Census Bureau[3]
SBA Lending Summary
200
Total SBA Loans
$260.3M
Total Loan Volume
$1.3M
Average Loan Size
10 yrs
Average Loan Term
9.78%
Average Interest Rate
1,832
Jobs Supported
Source: SBA 7(a) Program Data, U.S. Small Business Administration — FY 2025[4]
Key Insight: The SBA[7] classifies Warm Air Heating and Air-Conditioning Equipment Merchant Wholesalers under NAICS 423730 with a size standard of 175 employees. While several large national distributors operate extensive branch networks, many regional and independent HVAC wholesalers fall below the SBA ceiling. Qualifying firms can access SBA lending programs[8] for branch expansion, inventory financing, training center development, and working capital to support seasonal demand patterns in heating and cooling equipment distribution. Eligible businesses can access SBA 7(a) loans[9] for working capital, equipment, and acquisition financing, while 504 loans[10] support major fixed-asset purchases including real estate and heavy machinery.
Top SBA Lenders
| # | Lender | Loans | Volume | Avg Loan |
|---|---|---|---|---|
| 1 | The Huntington National Bank | 40 | $54.0M | $1.3M |
| 2 | TD Bank, National Association | 8 | $40.0M | $5.0M |
| 2 | American National Bank | 8 | $40.0M | $5.0M |
| 2 | Global One Bank | 8 | $40.0M | $5.0M |
| 5 | Newtek Bank, National Association | 16 | $32.8M | $2.0M |
Frequently Asked Questions
Common questions about this industry.
What types of businesses are classified under NAICS 423730?
NAICS 423730 covers merchant wholesalers distributing furnaces, air conditioners, heat pumps, air handlers, ductwork, thermostats, air filtration equipment, and HVAC supplies. These include national HVAC distribution chains, regional independent wholesalers, and manufacturer-owned distribution operations. Per the U.S. Census Bureau[5], about 2,090 businesses operated across 6,216 locations.
How is NAICS 423730 structured within the broader classification?
This code belongs to Industry Group 4237 (Hardware, and Plumbing and Heating Equipment and Supplies Merchant Wholesalers), Subsector 423 (Merchant Wholesalers, Durable Goods), and Sector 42 (Wholesale Trade). It shares Industry Group 4237 with 423710 (hardware), 423720 (plumbing), and 423740 (refrigeration).
What is the SBA size standard for NAICS 423730?
The SBA[7] sets the size standard at 175 employees. Businesses below this threshold qualify as small businesses for federal contracting set-asides and SBA-guaranteed loan programs.
Which NAICS codes are most closely related to 423730?
Plumbing wholesalers (423720) handle hydronic heating separately. Refrigeration wholesalers (423740) cover commercial cooling. HVAC equipment manufacturers (333415) and heating equipment makers (333414) supply products. Per Census Bureau NAICS references[11], the warm air focus distinguishes 423730 from the hydronic equipment in 423720.
What industries interact most with HVAC equipment wholesalers?
HVAC contractors (238220) are the primary customer segment. Air-conditioning manufacturers (333415) and furnace producers (333414) supply equipment. Per Bureau of Labor Statistics[6] data, residential and commercial construction spending and extreme weather events drive HVAC wholesale demand.
What specific activities are included in NAICS 423730?
Activities include distributing furnaces, air conditioners, heat pumps, air handlers, ductwork, thermostats, controls, mini-split systems, refrigerants, and ventilation equipment. Many distributors operate contractor training centers and offer equipment financing programs. Per Census Bureau definitions[12], plumbing fixtures and refrigeration equipment are excluded.
Can HVAC equipment wholesalers access SBA loans?
Yes. Distributors with fewer than 175 employees qualify for SBA loan programs[8] including 7(a) loans for inventory financing and working capital, 504 loans for branch and training facilities, and microloans for delivery vehicles. Seasonal inventory builds for cooling and heating seasons require working capital flexibility.
Where are HVAC equipment wholesalers concentrated in the United States?
Branch operations spread across all major metropolitan areas. Sun Belt states like Texas, Florida, Arizona, and Georgia support heavy air-conditioning distribution. Northern states drive heating equipment demand during winter months. National HVAC distributors operate hundreds of branch locations positioned to provide same-day delivery to contractor customers across their service territories.
Sources & References
Government datasets and editorial sources used in this report.
- [1]U.S. Bureau of Labor Statistics, Quarterly Census of Employment and Wages bls.gov
- [2]U.S. Census Bureau, Economic Census census.gov
- [3]U.S. Census Bureau, County Business Patterns census.gov
- [4]U.S. Small Business Administration, SBA 7(a) Loan Program Data data.sba.gov
- [5]U.S. Census Bureau data.census.gov
- [6]Bureau of Labor Statistics bls.gov
- [7]SBA size standard publications sba.gov
- [8]SBA lending programs sba.gov
- [9]SBA 7(a) loans sba.gov
- [10]504 loans sba.gov
- [11]Census Bureau NAICS references census.gov
- [12]Census Bureau definitions census.gov
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