Placement Matters Just as Much as the Material Itself
Once greenhouse owners understand how phase change materials (PCMs) work, the next question is usually practical.
"Where should I install it?"
It's an important question because even the most effective thermal storage material can't perform at its best if it's placed where it can't effectively absorb and release heat.
Unlike traditional insulation, which is designed to slow the movement of heat through a building envelope, phase change materials interact with the greenhouse environment every day. They absorb excess thermal energy when temperatures rise and release that energy as temperatures begin to fall.
For that process to work efficiently, placement matters.
The goal isn't simply to add thermal storage.
The goal is to place it where it can participate in the greenhouse's natural daily heating and cooling cycle.
START WITH THE SUN
Every greenhouse is powered by the same primary heat source.
The sun.
Throughout the day, solar radiation enters the structure, warming the air, plants, benches, flooring, and surrounding surfaces.
Ideally, phase change materials should be positioned where they have regular exposure to this changing thermal environment.
That doesn't necessarily mean direct sunlight.
In many cases, it's more important that the material experiences consistent temperature changes throughout the day than constant direct solar radiation.
Successful installations often focus on locations where warm air naturally circulates and where stored heat can later be released back into the growing space during cooler nighttime conditions.
THINK ABOUT AIRFLOW, NOT JUST LOCATION
One common misconception is that PCM should simply be placed wherever there is available space.
In reality, airflow plays a significant role in how effectively thermal storage performs.
As warm air moves throughout the greenhouse, it transfers energy to surrounding materials.
Areas with steady air circulation allow PCM to absorb heat more consistently during the day and release it more effectively as temperatures decline.
Conversely, placing thermal storage in isolated corners with little air movement may reduce its ability to interact with the overall greenhouse environment.
Good placement considers both heat and airflow.
COMMON INSTALLATION LOCATIONS
Depending on greenhouse design and operational goals, phase change materials may be incorporated in several different ways.
Potential installation locations include:
- Beneath growing benches
- Along perimeter walls
- Adjacent to walkways
- Integrated into bench systems
- Mounted within thermal storage panels
- Near areas with consistent daytime warmth
- Incorporated into purpose-built storage assemblies
The appropriate location depends on greenhouse layout, crop spacing, available solar gain, and overall environmental strategy.
Rather than asking which location is universally best, it's often more useful to ask which location allows the material to interact most effectively with the greenhouse's daily temperature cycle.
DISTRIBUTION IS OFTEN BETTER THAN CONCENTRATION
Another question we frequently hear is whether all the PCM should be installed in one location.
In many situations, distributing thermal storage throughout the greenhouse provides more balanced performance than concentrating it in a single area.
Multiple smaller thermal storage zones can interact with changing air temperatures across a larger portion of the structure, helping moderate environmental conditions more evenly.
The optimal approach depends on greenhouse design, but uniform distribution is often worth considering during system planning.
DON'T TREAT PCM LIKE INSULATION
One of the easiest mistakes to make is thinking of phase change materials as another insulation product.
They serve different purposes.
Insulation helps reduce heat loss.
Phase change materials help manage heat that's already inside the greenhouse.
Because of that distinction, placing PCM behind heavily insulated walls or in areas with minimal thermal interaction may reduce its effectiveness.
The material performs best when it's able to actively participate in the greenhouse's daily temperature changes.
EVERY GREENHOUSE IS DIFFERENT
Commercial glass greenhouses.
High tunnels.
Backyard hobby greenhouses.
Double-wall polycarbonate structures.
Each behaves differently.
Construction materials, ventilation systems, crop density, heating equipment, and local climate all influence where thermal storage will provide the greatest benefit.
That's one reason we avoid recommending a single installation layout for every project.
Good thermal storage begins with understanding how that specific greenhouse behaves.
Fore Energy Perspective
When people ask us where phase change material should be installed, we don't begin by pointing to a specific wall or bench.
We begin by asking questions.
How does the greenhouse gain heat during the day?
Where does it lose heat at night?
How does air move through the structure?
What temperatures are you trying to maintain?
The answers to those questions usually tell us far more than a floor plan alone.
Our goal isn't simply to install PCM.
Our goal is to integrate thermal storage into the greenhouse in a way that complements how the entire environment already works.
That's where thoughtful design creates lasting value.
- David Toups, Founder, Fore Energy
FINAL THOUGHTS
The effectiveness of phase change materials isn't determined solely by the product itself.
It's also influenced by how and where it's installed.
By considering solar gain, airflow, greenhouse layout, and environmental objectives, growers can create thermal storage systems that work with the greenhouse rather than simply occupying space inside it.
As interest in passive energy management continues to grow, we believe successful installations will be defined less by the amount of PCM used and more by how intelligently it's integrated into the overall greenhouse design.
Research & Industry Sources Referenced
- Cornell University Greenhouse Engineering Program
- Controlled Environment Agriculture Research
- ASABE Greenhouse Engineering Publications
- Greenhouse Environmental Control Literature
- Passive Solar Greenhouse Design Research
- Building Science & Thermal Storage Literature
Topics Discussed
- Phase Change Materials
- Greenhouse Design
- Thermal Storage
- Greenhouse Heating
- Passive Solar Design
- Environmental Control
- Airflow
- Greenhouse Energy Efficiency
Continue Reading
- How Much Phase Change Material Does My Greenhouse Need?
- How Phase Change Materials Stabilize Greenhouse Temperatures
- Do Phase Change Materials Actually Reduce Greenhouse Heating Costs?
- PCM vs. Water Barrels for Greenhouses: Which Stores Heat Better?