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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. Which refrigerant has been the standard for new residential split systems since R-22 was phased out?

    Answer: R-410A

    R-410A replaced R-22 as the standard residential refrigerant after the EPA phased out R-22 production due to its ozone-depleting properties.

  2. A Building Automation System (BAS) is more commonly found in commercial buildings than residential because:

    Answer: Commercial buildings have multiple HVAC zones and systems requiring centralized control

    BAS integrates control of multiple HVAC systems, lighting, and other building systems across many zones, which is impractical to manage manually in large commercial buildings.

  3. Economizer cycles are more commonly implemented in commercial HVAC systems because they:

    Answer: Use outdoor air for 'free cooling' when conditions allow, saving energy in large systems

    Economizers use outdoor air when it's cool enough to provide free cooling, and the energy savings justify the cost in large commercial systems.

  4. What is a dedicated outdoor air system (DOAS) primarily designed to handle?

    Answer: Ventilation and dehumidification of outdoor air separate from sensible cooling

    DOAS systems handle 100% outdoor air for ventilation and latent (moisture) loads, allowing other equipment to handle sensible cooling more efficiently.

  5. In commercial buildings, ASHRAE Standard 62.1 governs:

    Answer: Ventilation rates for acceptable indoor air quality

    ASHRAE 62.1 sets minimum ventilation rates for commercial buildings to ensure acceptable indoor air quality for occupants.

  6. A heat recovery ventilator (HRV) is used in residential buildings primarily to:

    Answer: Exchange stale indoor air for fresh outdoor air while recovering heat energy

    An HRV brings in fresh outdoor air while transferring heat from outgoing stale air, maintaining air quality without losing significant energy.

  7. Commercial HVAC maintenance contracts differ from residential service agreements primarily in that commercial contracts typically include:

    Answer: More frequent scheduled maintenance visits and detailed performance reporting

    Commercial HVAC systems serving occupied buildings require quarterly or monthly maintenance visits with detailed logs to maintain uptime and code compliance.