NV HVAC Contractor key terms

A credential issued by the Nevada State Contractors Board authorizing a person or entity to perform construction work in Nevada. HVAC work requires a license in the appropriate classification, such as Class A, B, or C-21.

A category of contractor license defined by the Board that specifies the scope of work allowed. For HVAC, common classifications include Class A (general engineering), Class B (general building), and Class C-21 (air conditioning and refrigeration).

An individual who meets the experience and examination requirements and is designated by a contractor to act as the responsible managing employee or owner. The qualifying party must be actively engaged in the business and can qualify only one active license.

An offer to perform work at a specified price. In Nevada, bids for certain public works must be submitted with a bid bond and comply with the Board's advertising and bidding requirements.

A bond guaranteeing that a bidder will enter into a contract if awarded the project. Nevada public works projects often require bid bonds, and failure to provide one may disqualify the bid.

A bond ensuring that a contractor will complete a project according to the contract terms. Nevada law may require performance bonds on public works projects to protect the owner from default.

A bond that guarantees payment to subcontractors and suppliers on a construction project. It protects the owner from liens and is often required on public works projects in Nevada.

A legal claim against a property by a contractor, subcontractor, or supplier for unpaid work or materials. In Nevada, strict notice and filing deadlines apply to preserve lien rights.

A written notice that a potential lien claimant must provide to the property owner and lender to preserve lien rights. Nevada requires this notice within a specified time after first furnishing labor or materials.

Heating, Ventilation, and Air Conditioning. The technology and systems used to control temperature, humidity, and air quality in buildings.

The process of determining the heating and cooling requirements of a building based on factors such as size, insulation, windows, occupancy, and climate. It ensures properly sized HVAC equipment.

A widely used method for residential heating and cooling load calculations, published by ACCA. It considers building envelope, orientation, and internal gains to determine required capacity.

An ACCA method for designing residential duct systems. It ensures proper airflow by sizing ducts based on equipment requirements and pressure losses.

The process of planning the layout, sizing, and routing of ducts to deliver conditioned air efficiently. It involves calculating friction losses and selecting fittings to balance airflow.

The resistance to airflow in a duct system, measured in inches of water column. Proper duct design keeps static pressure within the equipment manufacturer's limits to ensure adequate airflow.

The movement of air through a system, typically measured in cubic feet per minute (CFM). Proper airflow is essential for efficient heating and cooling and is determined by duct sizing and fan performance.

The thermodynamic process used in cooling systems that involves compression, condensation, expansion, and evaporation of a refrigerant to transfer heat from one place to another.

A substance used in refrigeration systems that absorbs and releases heat as it changes state. Common types include R-410A and R-134a, which are regulated for environmental impact.

A federal regulation under the Clean Air Act that governs the handling and disposal of refrigerants. Technicians must be certified to purchase and handle refrigerants, and proper recovery is required.

The process of removing refrigerant from a system and storing it in an external container for reuse, recycling, or disposal. Required by EPA regulations to prevent ozone depletion and global warming.

The component in a refrigeration system that increases the pressure and temperature of the refrigerant vapor, enabling heat rejection in the condenser.

A heat exchanger in which refrigerant releases heat to the surroundings and condenses from a vapor to a liquid. It is a key component in the refrigeration cycle.

A heat exchanger in which refrigerant absorbs heat from the space being cooled and evaporates from a liquid to a vapor. It is essential for cooling and dehumidification.

A path that allows electric current to flow from a power source through components and back. HVAC equipment requires properly sized circuits, overcurrent protection, and grounding.

A device, such as a circuit breaker or fuse, that interrupts excessive current to prevent damage or fire. HVAC systems must have properly sized overcurrent protection according to code.

The intentional connection of electrical equipment to the earth to provide a safe path for fault currents. Proper grounding is required by the National Electrical Code for HVAC installations.

A control device that regulates temperature by switching heating or cooling equipment on and off. Modern thermostats may be programmable or smart, enabling energy savings and remote control.

A centralized control system that monitors and manages HVAC, lighting, and other building systems. It improves energy efficiency and occupant comfort through scheduling and optimization.

The process of verifying that building systems are designed, installed, and operate according to the owner's requirements. It includes testing, adjusting, and balancing (TAB) and documentation.

A systematic process to ensure that HVAC systems deliver the designed airflow and water flow. It involves measuring and adjusting dampers, valves, and fan speeds to achieve balance.

The initial operation of HVAC equipment after installation to verify proper function. It includes checking electrical connections, refrigerant charge, and controls before handing over to the owner.

A legally binding agreement between parties that outlines the scope of work, payment terms, and responsibilities. Nevada law requires written contracts for certain residential improvement projects.

A written modification to the original contract that alters the scope, price, or schedule of work. It must be signed by both parties to be enforceable.

A document that provides information about the hazards, handling, and emergency procedures for chemicals used in the workplace. OSHA requires employers to maintain SDSs for hazardous materials.

Equipment worn to minimize exposure to hazards, such as gloves, goggles, and respirators. Employers must provide PPE and train workers on its use.

OSHA standard requiring employers to inform workers about chemical hazards through labels, safety data sheets, and training. It ensures workers understand risks and safe handling procedures.

The application of knowledge, skills, and techniques to plan, execute, and complete a project within constraints of time, cost, and quality. It involves scheduling, budgeting, and communication.

The process of directing conditioned air from the HVAC equipment to the occupied spaces through ducts, registers, and diffusers. Proper design ensures comfort and energy efficiency.

A device that transfers heat from a cooler space to a warmer space using the refrigeration cycle. It can provide both heating and cooling and is efficient in moderate climates.

A heating appliance that uses fuel or electricity to warm air, which is then distributed through ducts. Proper sizing and installation are critical for efficiency and safety.