Clarifoil Anti-Fog Film for Frozen Doors — ASDA Field Study

Study Type: Multi-site retail field study (sub-metered energy)
Operator: ASDA (England)
Location: England (3 stores)
Period: January–May 2024
Contact: info@mphglobal.com

Sub-metered energy study at three ASDA locations in England (January–May 2024) demonstrating Clarifoil's impact on frozen case trim heat. Cases were monitored daily before and after installation, with trim heaters set to 20% power based on customer preference.

Key Findings

31–41% electrical savings with trim heat at 20%
39–51% savings with trim heat off
Up to 1,570 kWh saved per door per year
Clear door visibility maintained after repeated openings

Study pages

Detailed findings

Study objective

Demonstrate Clarifoil's effectiveness in reducing electrical demand and consumption on frozen food cases by eliminating condensation and frost, allowing trim heaters to be turned down or turned off while maintaining clear door visibility.

Problem statement

Traditional trim heaters on freezer doors consume significant energy.
Heaters often fail to stop condensation; fogged glass hides product and discourages purchase.
Fog and frost buildup create merchandising and maintenance headaches.

Solution

Clarifoil anti-fog film eliminates condensation and frost buildup on freezer doors.
Trim heaters can be dialed down (e.g. to 20% power) or turned off entirely.
Customers retain crystal-clear visibility even after doors are opened repeatedly.

Global adoption

Used in 750+ stores
Installed on 75,000+ doors across the US and Europe

Headline findings

31–41%

Savings @ 20% trim heat

39–51%

Savings, trim heat off

1,278

kWh saved / door / yr @ 20%

1,570

kWh saved / door / yr, off

Per-site results

All three sites finished at 20% trim power based on customer preference.

Site	Before avg (kWh)	After setting (kWh)	Reduction	Method
ASDA #1	652	426	35%	Gradual decrease to optimal trim heat setting
ASDA #2	550	380	31% overnight	Direct overnight adjustment
ASDA #3	220	130	41%	Overnight adjustment; smaller doors

ASDA #3 showed the highest percentage reduction due to smaller door baseline.