HVAC Code Reference
Instant access to the mechanical, ventilation, refrigerant, and efficiency codes that govern HVAC work. Searchable IMC, UMC, IRC, IFGC, ACCA Manuals, ASHRAE standards, EPA Section 608, and DOE efficiency rules - built for the field.
Open Code ReferenceWhich Codes Govern HVAC?
Unlike electrical work, HVAC isn't ruled by a single book. It sits on a stack of codes and standards: model mechanical codes (the IMC from the ICC and the UMC from IAPMO), the mechanical chapters of the IRC for homes, the IFGC for gas-fired equipment, ACCA design manuals, ASHRAE safety and ventilation standards, and federal EPA and DOE regulations.
Which edition applies depends on your jurisdiction - states and municipalities adopt specific code years, often with local amendments. Ventora puts the key requirements from every one of those bodies in a quick, searchable reference on your phone, so you don't have to carry a shelf of code books to the job.
HVAC Code & Standard Families
Model Mechanical Codes - IMC & UMC
Prescriptive requirements for HVAC equipment, ducts, exhaust, and combustion air. IMC (ICC) is used nationwide; UMC (IAPMO) is common across the western states
Residential Mechanical - IRC
Mechanical chapters (M1201-M2500) for 1- and 2-family dwellings: equipment installation, duct sizing, appliance clearances, and ventilation
Fuel Gas - IFGC
Gas piping, appliance venting, and combustion air for gas-fired furnaces, boilers, and water heaters
Load & Duct Design - ACCA Manuals
Manual J (load calc), Manual S (equipment selection), Manual D (duct design), Manual T (air distribution), Manual N (commercial loads)
Refrigeration Safety - ASHRAE 15 & 34
Machinery rooms, refrigerant piping, and leak detection, plus A/B toxicity and 1/2L/2/3 flammability classification for refrigerants like R-454B
Ventilation & Comfort - ASHRAE 62.1 / 62.2 / 55 / 170
Minimum ventilation rates for indoor air quality, thermal comfort parameters, and healthcare facility air-change requirements
Energy - ASHRAE 90.1 & DOE
Building energy-efficiency requirements plus federal minimum SEER2, HSPF2, and AFUE ratings for equipment sold in the US
Refrigerant Regulation - EPA 608 & AIM Act
Section 608 certification (Type I / II / III / Universal), leak repair and recovery rules, and the HFC phasedown to low-GWP A2L refrigerants
Local Adoption & Amendments
Jurisdictions adopt a specific code edition and may add local amendments - always confirm the edition enforced by your AHJ
Most-Referenced Codes & Standards
| Code / Standard | What It Governs |
|---|---|
| IMC | Mechanical systems, ducts, exhaust, combustion air (ICC) |
| UMC | Mechanical systems - western states equivalent (IAPMO) |
| IRC (Ch. 12-24) | Residential mechanical and duct provisions for 1-2 family dwellings |
| IFGC | Gas piping, appliance venting, and combustion air (ICC) |
| ACCA Manual J | Residential heating and cooling load calculation |
| ACCA Manual S | Equipment selection and acceptable sizing limits |
| ACCA Manual D | Residential duct design and friction-rate sizing |
| ACCA Manual T | Air distribution - registers, grilles, and diffusers |
| ASHRAE 15 & 34 | Refrigeration system safety and refrigerant classification |
| ASHRAE 62.1 / 62.2 | Ventilation for acceptable indoor air quality (commercial / residential) |
| ASHRAE 90.1 | Energy standard for commercial buildings |
| EPA Section 608 | Refrigerant handling certification, leak repair, and recovery |
EPA 608 Certifications & Efficiency Rules
EPA 608 - Type I
Servicing small appliances (5 lb or less of refrigerant)
EPA 608 - Type II
High-pressure and very-high-pressure appliances (most AC / heat pumps)
EPA 608 - Type III
Low-pressure appliances (centrifugal chillers)
EPA 608 - Universal
Covers Type I, II, and III - required to handle all refrigerant systems
AIM Act
HFC phasedown - new residential/light-commercial AC must use GWP < 700 refrigerant as of Jan 1, 2025
DOE SEER2
Minimum seasonal cooling efficiency, with regional North/South standards
DOE HSPF2
Minimum seasonal heating efficiency for heat pumps
DOE AFUE
Minimum annual fuel-utilization efficiency for furnaces and boilers
Ventora HVAC Code Reference Features
Quick Search
Search by code, standard, ACCA manual, or keyword. Find the requirement you need in seconds.
Organized by Body
ICC, IAPMO, ACCA, ASHRAE, EPA, and DOE references grouped for fast lookup. No more flipping between books.
Built for the Field
Works offline in attics, rooftops, and crawlspaces. Designed for use on your phone.
AI Code Assistant
Ask about a code requirement and get a plain-language answer with the governing standard cited.
Field-Reference Disclaimer
Ventora summarizes HVAC codes and standards for quick field reference. It is not a substitute for the official code text. Always verify requirements against the specific code edition adopted by your jurisdiction (AHJ), the current published standard, and manufacturer installation instructions. Code editions and local amendments change over time. IMC, IRC, and IFGC are marks of the ICC; UMC of IAPMO; the Manual J/S/D/T/N series of ACCA; the 15/34/55/62.1/62.2/90.1/170 standards of ASHRAE; Section 608 and the AIM Act are administered by the US EPA; SEER2/HSPF2/AFUE by the US DOE. Ventora is not affiliated with, endorsed by, or sponsored by any of these organizations; all trademarks belong to their respective owners.
HVAC Codes in Your Pocket
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