ASHRAE Guideline 36 publishes standardized, high-performance control sequences for common commercial HVAC systems — VAV air handlers, terminal boxes, and more. Specifying Guideline 36 gives an owner vetted, efficient control logic instead of sequences reinvented job-by-job, and it makes competing controls bids more consistent and comparable.
For decades, HVAC control sequences were written from scratch on every project, with wide variation in quality. Two engineers would specify the same VAV system differently, two controls contractors would interpret the same spec differently, and buildings ran on logic that was rarely optimal and hard to verify.
Guideline 36 standardizes the sequences — codifying detailed, tested, high-performance control logic that the whole industry can specify and implement consistently.
Guideline 36 provides detailed sequences of operation for common systems — single-zone and multiple-zone VAV air handlers, VAV terminal units, and supporting routines like trim-and-respond setpoint reset. The sequences are written precisely enough to be programmed directly, with the logic, setpoints, and reset strategies spelled out.
It is, in effect, a library of expert control sequences an engineer can reference rather than recreate.
The Guideline 36 sequences are designed for efficiency — they include strategies like demand-based setpoint reset that cut energy use while maintaining comfort. Because they are vetted and detailed, they avoid the gaps and ambiguities that cause poorly performing custom sequences.
A building run on Guideline 36 logic generally performs closer to its potential, which matters most in an energy-intensive Florida cooling climate.
When a controls scope references Guideline 36, every bidder is pricing the same well-defined logic, so bids are more comparable and the owner is less exposed to a low bid that hides a weak sequence. It also reduces commissioning surprises, because the expected behavior is documented in detail.
For owners, specifying Guideline 36 is a quality floor that raises the baseline of how well the building will run — and how verifiable it is.
Guideline 36 defines the sequences; it still needs a complete points list and a vendor-neutral protocol specification to be implemented well. Think of it as the high-quality content of the controls scope, paired with the open-protocol decisions that keep the system serviceable.
In design-build, we specify Guideline 36 sequences where they fit the system, then commission against them — the sequences become the functional test script.
ASHRAE Guideline 36 is a published set of standardized, high-performance control sequences for common commercial HVAC systems such as VAV air handlers and terminal units. It gives engineers vetted, detailed control logic to specify rather than reinventing sequences on each project.
It provides efficient, vetted control sequences that improve building performance, and it makes controls bids more consistent and comparable because every bidder prices the same well-defined logic. It also reduces commissioning surprises by documenting expected behavior in detail.
It is designed to. The sequences include efficiency strategies such as demand-based setpoint reset (trim-and-respond) that reduce energy use while maintaining comfort — valuable in an energy-intensive Florida cooling climate.
No — it is a guideline, not a code mandate. Owners and engineers choose to specify it as a quality standard. It complements, rather than replaces, the points list and protocol decisions in a complete controls scope.
Suncoast Cold Systems delivers commercial HVAC design-build across Tampa, St. Petersburg, Clearwater, Brandon, Riverview, Temple Terrace, and Wesley Chapel — load calcs, equipment selection, layouts, controls, install, and commissioning under one contract. Licensed Class A A/C Contractor (FL #CAC1824642), with a Florida PE of record on sealed work.
Where Guideline 36 sequences fit.
Specific control strategies and code.
Controls scope built to your standard.