Cannabis Engineers: The Unsung Heroes of the Industry

Traditional buildings are engineered for human comfort. Cannabis facilities are engineered for plant survival. Load calculations are driven by transpiration rates, lighting intensity, humidity targets, vapor pressure deficit (VPD), and CO₂ enrichment rather than people occupancy, window solar gain, computers, etc.

“Performing the HVACD load calculations are not intuitive and requires special knowledge of growing indoors and plant biology,” Megerson explains. “Engineers have to understand their customers — the plants.”

He describes cultivation design through what he calls the “plant-centric approach”: temperature and humidity, CO₂, lighting, and nutrients. “If one of those systems or variables fails, the plant will not survive — and at best will struggle and have diminished yields.”

In cannabis, HVACD is not a support system. It is the system that drives nutrient delivery to the plant

The Most Litigated System in Cannabis

According to Sam Andras, President of 3rd Act Architecture and Consulting, mechanical systems are the most litigated component in cannabis facilities.

“The determination of the mechanical system will have a drastic impact on CapEx, OpEx, and the ability to maintain environmental parameters,” Andras says. “Integration of cultivation lighting, fertigation systems, environmental controls, HVAC, fans, odor mitigation — coordination is critical.”

The complexity of these systems and the cost of getting them wrong cannot be overstated.

In a competitive industry with tight margins, a poorly designed mechanical system can mean ballooning energy costs, inconsistent yields, and delayed openings. Andras stresses the importance of integrated design from the outset.

“Projects must be led by individuals who can implement a proven roadmap to success,” he explains. “A roadmap focused on collaboration across ownership, design, and construction.”

When a facility runs smoothly, with stable temperatures, balanced airflow, and consistent lighting, it often appears effortless. “Experience and a well-coordinated and collaborative process are what make that possible,” Andras says.

Translating Between Cannabis Engineers, Growers, and Investors

Cannabis facility design goes beyond technical calculations and equipment specifications. It requires translation between disciplines, priorities, and perspectives. At its core, successful design depends on aligning engineering realities with cultivation goals and business expectations.

“Cultivators, engineers, and investors all speak different languages,” says Jesse Porter, Director of Marketing & Sales at Harvest Integrated.

Engineers think in mechanical limits and code compliance. Growers think in VPD, canopy performance, and yield targets. Investors focus on financial return. When expectations aren’t aligned, projects falter.

“A lot of times, there’s finger-pointing,” Porter says. “The grower wants an aggressive environmental target. The engineer says they can design for it. Then the HVACD required to hit that target blows the budget.”

The solution isn’t overdesign. It’s an honest conversation.

“Let’s focus on meeting realistic expectations,” Porter explains. “There are often other ways to control environmental conditions beyond just increasing mechanical capacity.”

Once the facility is operational, engineering doesn’t stop.

“Once a facility is humming, it’s critical to monitor KPIs and maintain equipment,” Porter says. “Filters, airflow, lighting intensity — when those fall out of line, performance drops.”

Engineering, in that sense, is ongoing risk management.

Learning the Hard Way — Or Hiring Experience

For owners entering the cultivation space, the engineering learning curve can be steep.

“The engineering side of cannabis cultivation is massive, and I think people underestimate that — especially if they haven’t built a controlled indoor facility before,” said Sarah Trent, Founder and CEO of Valley Wellness dispensary in New Jersey. “I came into this project with construction management experience, but not deep cultivation experience, so I knew it was critical to surround myself with experts who had done it successfully.”

Trent emphasizes how underestimated controlled environment agriculture can be.

“Even growers from legacy or outdoor markets may not have experience with highly controlled indoor systems. People underestimate that complexity.”

During construction, communication became her lifeline.

“When I was onsite with contractors, I made it a priority to ensure we fully understood how every system was going to function,” she says. “Rather than letting details get lost in translation, I brought the engineers directly into the conversation. We had weekly calls, often after long days onsite, to walk through means and methods and confirm alignment. That level of collaboration and direct communication made a significant difference in how smoothly the project moved forward.”

Trent also values engineers who educate rather than dictate.

“Walking trade show floors together, explaining packaged units, helping me understand what I was buying — that extra effort helped me make better business decisions.”

For her, engineering decisions were business decisions.

“I wanted to know CapEx. How many rooms? How much canopy? Does this make financial sense? Engineering played a large role in that.”

Build It Right — or Pay for It Later

On the construction side, the margin for error is slim, and the consequences are expensive. Decisions made during design and preconstruction echo throughout the life of the facility, often determining whether a project operates efficiently or struggles to keep up.

“Proper sizing and specification of mechanical and electrical equipment is critical,” says Pete Hall, Vice President of Palmer Construction Company, Inc.

Hall frequently sees owners consult equipment vendors before engineers—a move that can limit understanding of system alternatives and constraints.

“Early and consistent communication of design goals, paired with realistic budgets, is critical,” Hall says. “Most cannabis projects stall in preconstruction due to unrealistic budgets.”

Flexibility is equally important.