NM HVAC Contractor key terms

New Mexico statute, compiled in NMSA Chapter 60, Article 13, that creates the Construction Industries Division and requires contractors to hold a license before bidding or performing construction work in the state.

The unit of the New Mexico Regulation and Licensing Department that administers contractor licensing, adopts rules in NMAC Title 14 Chapter 6, issues permits, and enforces code compliance for construction statewide.

The New Mexico Administrative Code chapter containing CID rules: licensing requirements, contractor classifications, permit procedures, code adoption, inspection processes, and disciplinary provisions that govern HVAC contracting practice.

The individual who passes the trade and business examinations and is named on a contractor's license, thereby accepting responsibility for the licensee's code compliance and supervision of construction work.

A category of contractor authority defined in NMAC Title 14, such as mechanical (MM), plumbing, electrical, or general construction, that limits the scope of work a licensee may legally bid, contract, and perform.

Written authorization issued by CID or a delegated local authority allowing installation, alteration, or replacement of HVAC equipment and systems, subject to required inspections before the work is covered or placed in service.

An inspection performed after framing, ductwork, piping, wiring, and venting are installed but before concealment by drywall or other finish, verifying code compliance while components remain visible and accessible.

The last inspection of permitted work, confirming equipment operates correctly, clearances and venting are correct, controls and labeling are complete, and the installation matches the approved plans before sign-off.

A document issued by the building official stating that a structure complies with applicable codes and may be legally occupied; HVAC final approval is normally a prerequisite for its issuance.

A lien is a legal claim against property securing payment for labor or materials supplied; a waiver is a signed release of that claim, often required before a general contractor releases progress payments.

A percentage of each progress payment withheld by the owner or general contractor until project completion or a specified milestone, protecting against incomplete or defective work and unpaid subcontractors.

A written, signed modification to the contract scope, price, or schedule; without one, added work is difficult to collect and may be treated as uncompensated extra work.

A documented list of incomplete or deficient items identified near project completion that the contractor must correct before final acceptance and release of final payment or retainage.

ACCA method for calculating residential heating and cooling loads from envelope construction, window area and orientation, infiltration, internal gains, and design indoor and outdoor temperatures, producing room-by-room and whole-house loads.

ACCA procedure for selecting heating and cooling equipment whose published capacities match the Manual J calculated loads at the actual design conditions, accounting for altitude and sensible-to-total ratios.

ACCA method for designing duct systems, sizing trunks and branches from room airflow, selecting fittings, and calculating available static pressure so the blower can deliver design airflow.

The difference between the indoor design temperature and the outdoor design temperature used in load calculations; it drives transmission and infiltration loads through walls, windows, and building leakage.

The fraction of total equipment capacity that removes sensible heat, calculated as sensible capacity divided by total capacity; it must match the building load so the space is dehumidified properly.

Energy absorbed or released during a change of state without a temperature change, such as water vapor condensing on a cooling coil; latent load determines moisture removal requirements and required dehumidification capacity.

A graphical tool plotting dry-bulb temperature, wet-bulb temperature, humidity ratio, relative humidity, enthalpy, and specific volume, used to analyze air conditioning processes and coil performance.

The temperature of air measured by a thermometer with a wetted wick exposed to moving air; it indicates evaporative cooling potential and, combined with dry-bulb, establishes humidity and enthalpy.

Air supplied to a fuel-burning appliance for complete combustion and draft dilution; codes require a permanent opening or ducted supply sized by appliance input rating and the presence of tight construction.

A gas appliance with a non-positive vent pressure that operates with a flue gas temperature high enough to avoid condensation in the vent, typically vented through a listed metal flue or masonry chimney.

A device on a natural-draft appliance that limits draft over the burners, mixes flue gases with dilution air, and prevents downdrafts or excessive draft from disturbing combustion.

The passage or pipe conveying combustion products from an appliance to the outdoors; its sizing, material, slope, and termination must match the appliance category and code listing.

An EPA credential required for technicians who service, repair, or dispose of appliances containing ozone-depleting refrigerants or their substitutes, obtained by passing a Type I, II, III, or Universal examination.

Removing refrigerant from a system into a recovery cylinder or machine rather than venting it to the atmosphere; required evacuation levels depend on the appliance type and whether it is being repaired or decommissioned.

Superheat is the temperature of vapor above its saturation point, used to set and verify expansion valve charge; subcooling is liquid cooled below saturation, indicating condenser charge and performance.

The resistance a blower must overcome in the duct system plus components such as coils and filters, measured in inches of water column; it determines whether design airflow can be delivered.

The friction loss of a duct fitting expressed as the length of straight duct producing the same pressure drop; used in Manual D to size ducts and check available static pressure.

The thermal resistance of duct insulation required by the energy code based on duct location; ducts in unconditioned attics, garages, or outdoors need higher values than ducts within conditioned space.

A pressurization test measuring air lost through duct joints and seams, expressed as CFM per 100 square feet of conditioned floor area, used to verify energy code compliance for new systems.

New Mexico's adopted energy code, based on the IECC with state amendments, governing envelope, duct, HVAC efficiency, lighting, and testing requirements for new and altered construction.

The current drawn by a motor at standstill with rated voltage applied; used with breaker and conductor sizing and to verify start components on compressors.

The current a motor draws at rated load, voltage, and frequency as shown on its nameplate; used to size branch-circuit conductors, overcurrent devices, and disconnect ratings.

A device or relay that interrupts motor current when sustained current exceeds the rated value, protecting windings from overheating while allowing normal starting current.

OSHA-required procedure for de-energizing and isolating energy sources, applying locks and tags, and verifying zero energy before servicing equipment, preventing unexpected startup or release of stored energy.

Employer-provided gear such as gloves, eye protection, respirators, and fall protection that reduces worker exposure to hazards; required when engineering and administrative controls cannot eliminate the risk.

Systems and practices, including guardrails, harnesses, and anchorage, required when workers are exposed to falls from heights; OSHA rules set trigger heights and training obligations for construction work.

Entry into a space with limited access that may contain hazardous atmosphere or engulfment hazards; requires hazard evaluation, atmospheric testing, attendant, and permit procedures unless classified as non-permit.