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Acronymsaka: American Society of Heating Refrigerating and Air-Conditioning Engineers

ASHRAE

In Plain English

The engineering society that writes the standards for HVAC systems and building energy efficiency.

Definition

ASHRAE (the American Society of Heating, Refrigerating and Air-Conditioning Engineers) is a global technical society that publishes standards for building mechanical systems, indoor air quality, and energy efficiency. ASHRAE 90.1 (Energy Standard for Buildings) and ASHRAE 62.1 (Ventilation for Acceptable Indoor Air Quality) are among the most referenced standards in commercial construction and are incorporated into energy codes across the U.S. ASHRAE certifications are widely recognized credentials for MEP engineers and building energy professionals.

Why It Matters in Bidding

When a spec invokes ASHRAE 90.1 or 62.1, it directly drives equipment selection, ductwork sizing, and ventilation rates that the MEP estimator must price, so misreading the referenced edition can mean bidding the wrong system entirely. Because energy codes adopt ASHRAE standards by reference, compliance is enforceable at permit and inspection, making it a scope and risk issue rather than an optional best practice.

Example

Reviewing the mechanical spec, the estimator flagged that ASHRAE 90.1 required higher-efficiency rooftop units than the schedule showed and submitted an RFI before bid day to avoid pricing equipment that would fail energy-code review.

Related Terms

MEP (Mechanical, Electrical, Plumbing)LEED (Leadership in Energy and Environmental Design)IBC (International Building Code)

Frequently Asked Questions

It sets minimum efficiency and envelope requirements that dictate which HVAC equipment, insulation, glazing, and lighting controls you can specify and price. A bid built on lower-efficiency assumptions risks rejection at permit or costly substitutions later, so estimators verify the cited edition and confirm the equipment schedule actually meets it before committing numbers.
90.1 governs energy efficiency, covering HVAC equipment, envelope, lighting, and power. 62.1 governs ventilation and indoor air quality, setting minimum outdoor-air rates per occupant and space type. Both can affect equipment sizing, but 62.1 often increases fan and ductwork capacity while 90.1 drives efficiency ratings, so estimators check which editions the project references.
No. Membership and ASHRAE credentials matter for the design engineers who size systems, not for pricing them. An estimator only needs to read and apply the referenced standards correctly during takeoff. Understanding how 90.1 and 62.1 affect equipment selection is far more valuable to a bid than holding the certification itself.

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