AHJ (Authority Having Jurisdiction)
The local department that enforces building, mechanical, plumbing, and related code requirements for your address.
See Related Learning PageAir Handler
The indoor HVAC component that moves conditioned air through ducts and houses the evaporator coil in many systems.
See Related Learning PageCombustion Safety
Verification that gas-burning equipment ignites, vents, and operates within safe limits.
See Related Learning PageCondensate Drain
The drainage path that removes moisture collected by the cooling coil during AC operation.
See Related Learning PageDuct Static Pressure
A measurement of airflow resistance in the duct system that impacts comfort, efficiency, and equipment strain.
See Related Learning PageEmergency Service
After-hours dispatch for urgent failures that materially affect safety, sanitation, or immediate comfort.
See Related Learning PageHeat Pump
An HVAC system that can provide both cooling and heating by moving heat rather than generating it through combustion.
See Related Learning PageHydronic Heating
A heating method that circulates heated water through pipes/radiators, commonly associated with boiler systems.
See Related Learning PageInspection Sequence
The ordered set of AHJ inspection checkpoints required before a permitted job can be considered compliant.
See Related Learning PageLatent Load
The moisture-removal demand placed on an AC system, especially important in humid climates.
See Related Learning PageLifecycle Cost
The full long-term cost of ownership, including energy, maintenance, repairs, and replacement timing.
See Related Learning PageLoad Calculation
A sizing method used to determine the appropriate heating/cooling equipment capacity for a home.
See Related Learning PageNo-Heat Event
A condition where the heating system cannot maintain safe or usable indoor comfort.
See Related Learning PagePermit-Ready Scope
A project definition that includes code pathway, AHJ handling, inspection plan, and responsibility mapping.
See Related Learning PagePreventive Maintenance
Scheduled service intended to reduce failure risk, preserve performance, and extend equipment life.
See Related Learning PageRoot Cause Diagnostic
A troubleshooting process focused on underlying system failure drivers rather than only visible symptoms.
See Related Learning PageSensible Cooling
The temperature-reduction portion of AC performance, separate from humidity removal.
See Related Learning PageService Window
The expected arrival timeframe for scheduled field service, often influenced by urgency and dispatch load.
See Related Learning PageTankless Water Heater
An on-demand water-heating system that heats water as needed rather than storing hot water in a tank.
See Related Learning PageTotal Project Risk
Combined risk across cost overrun, schedule delay, compliance issues, comfort outcomes, and future liability.
See Related Learning Page