How To Insulate Your Room

The insulation you choose is the foundation of your cooler’s performance. For best results, we recommend:

• Rigid Foam Board Insulation (such as polyisocyanurate or extruded polystyrene) – offers high R-value per inch, excellent moisture resistance, and is easy to cut and install.
• Closed-Cell Spray Foam – ideal for sealing tight or irregular spaces. It adheres directly to surfaces, creating an airtight, moisture-resistant barrier.

Avoid fiberglass insulation – it absorbs moisture, which can lead to mold and greatly reduce insulation effectiveness in a cold, humid environment. Rigid foam is the easiest option for most DIY builders—it’s affordable, widely available, and simple to work with.

• You’ll likely need 2–3 layers of foam board to reach R-25, depending on the material

If your cooler operates below 37°F: Insulate your floor as well using 1–2 inches of rigid foam topped with plywood to prevent condensation and temperature loss.

• Rigid foam boards (or spray foam if applicable)
• Seam tape (aluminum or foil-faced recommended)
• Spray foam sealant for gaps and corners
• Vapor barrier (plastic sheeting for the warm side of the wall)
• Utility knife or insulation saw
• Measuring tape, level, and marker
• Caulk or construction adhesive (optional, for added adhesion)

Before installing, measure all surfaces and sketch a layout to plan cuts and reduce waste. Store foam boards flat and dry to prevent damage.

• Cut foam boards to fit snugly between framing or wall sections
• Secure boards with screws, insulation fasteners, or adhesive as needed
• Seal every seam and joint with seam tape to prevent air leakage
• Use spray foam sealant in corners, gaps, or around irregular edges
• For spray foam: apply in thin, even layers, and allow full cure time
• Install a vapor barrier (typically a plastic sheet) on the warm side of the insulation to prevent condensation buildup

Before powering up your cooler, take time to carefully inspect your insulation work. This is your final chance to catch and correct any potential weak points.

• Are all seams sealed with foil tape or spray foam?
• Are there any visible gaps or exposed edges?
• Is the vapor barrier properly installed and secured on the warm side?
• Have all corners, ceiling edges, and floor transitions been addressed?

To check for air leaks, use the “flashlight test”: look for light shining through while inside the dark cooler. Confirm your A/C is properly sized with good airflow, and consider a curtain or door closer if traffic is frequent. Once sealed, you’re ready to install your CoolBot and start cooling.