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Residential vs Commercial HVAC Flashcards

7 cards from real HVAC practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Residential vs Commercial HVAC flashcards as text

  1. A variable refrigerant flow (VRF) system is best described as:

    Answer: A commercial system that varies refrigerant flow to multiple indoor units from one outdoor unit

    VRF systems use one outdoor unit to serve multiple indoor units simultaneously, varying refrigerant flow to meet each zone's individual load.

  2. Which factor most significantly increases the design complexity of commercial HVAC versus residential?

    Answer: Multiple simultaneous occupancy zones with varying loads and schedules

    Commercial buildings have diverse zones (conference rooms, server rooms, lobbies) with different occupancy schedules and load profiles, requiring complex zoning strategies.

  3. Duct leakage testing is required by energy codes primarily in:

    Answer: New residential construction to verify duct system integrity

    Energy codes such as IECC require duct leakage testing in new residential construction to ensure systems perform as designed and minimize energy waste.

  4. What is the primary purpose of a cooling tower in a commercial HVAC system?

    Answer: To reject heat from condenser water to the atmosphere

    Cooling towers reject heat from the condenser water loop by evaporating a small portion of water, enabling water-cooled chillers to operate efficiently.

  5. In residential HVAC, Manual J calculations are used to determine:

    Answer: Heating and cooling load requirements for proper equipment sizing

    Manual J is the ACCA standard method for calculating residential heating and cooling loads to correctly size HVAC equipment.

  6. Which commercial HVAC system component is responsible for distributing conditioned air to specific zones based on thermostat demand?

    Answer: VAV terminal box

    VAV terminal boxes modulate airflow to individual zones in response to zone thermostat signals, providing precise temperature control.

  7. A residential mini-split system differs from a standard split system in that it:

    Answer: Delivers conditioned air directly to zones without ductwork

    Mini-split (ductless) systems connect an outdoor unit to one or more indoor air handlers mounted on walls or ceilings, eliminating the need for duct distribution.