CASE STUDY Dollar Store Retrofit Professional HVAC/R Services / Pro Green Technologies Avon Lake, Ohio


Equipment on Site

8’ x 8’ x 7’ Freezer

Equipment Applied

(1) KE2 Adaptive Control

(1) KE2 LDA Communication Device

  • 23.93% reduction in energy usage
  • Eliminated icing issues on all surfaces
  • Reduced defrost cycles by almost 89%
  • More stable temperature
  • Ease of installation reduced equipment down time
  • Ability to remotely monitor & control with KE2 LDA
  • Alarm notification via text or e-mail with the KE2 LDA

With over 40 years of experience, and installations across the country, Professional HVAC/R Services (PRO), with industry veteran Joe Kokinda, is no stranger to unique or difficult refrigeration applications.

The company is best known for installing environmentally efficient, self-contained supermarket grade refrigeration fixtures, for standard retail locations. PRO’s green approach to refrigeration, has led them in pursuit of products that provide the best energy savings possible, as well as quick and easy installation.

PRO’s energy arm, Pro Green Technologies was introduced to the KE2 Adaptive Control in January of 2017. Pro Green quickly determined the controller was worth putting on a test site. So, when they were called in to correct major icing issues on a dollar store walk-in, Rob Draga, Executive VP for Pro Green, decided to use the store as the test site.

Prior to the retrofit, the walk-in was using a standard digital controller with time initiated, temperature terminated, defrost. Despite the digital controller initiating a defrost cycle four times a day, ice continued to build on the coil, ceiling, walls, and floor, see Figures 1 & 2.

Figure 1 – Ceiling Before with Digital Controller Figure 2 – Floor Before with Digital Controller

For the test, PRO wanted to compare the existing digital control, with the KE2 Adaptive Control, for performance and energy savings. To gather the data, a KE2 LDA communication device was installed. This provided the ability to remotely monitor, control, and send alarm notifications. The system was then run for one month using the existing digital controller, see the Orange graph line in Figure 3. Then, the system was retrofit with the KE2 Adaptive Control, and run for almost a month, as indicated by the Blue line, in Figure 3.

Figure 3 – Walk-in Temperature Fluctuation
Digital Controller – Orange
KE2 Adaptive Control – Blue

The adaptive defrost algorithm in the KE2 Adaptive Control, reduced the number of defrost cycles from 120 a month to less than 13, maintaining a more steady space temperature, and saving 24% of the energy needed to operate the walk-in freezer. A summary from the test is shown in Figure 4.

Figure 4 – Performance Comparison Summary

Digital Controller KE2 Adaptive Control
Average Walk-in Temperature -6.09°F -6.75°F
Average Stock Room Temp Day 70.81°F 70.05°F
Average Stock Room Temp Night 66.92°F 64.23°F
Relative Humidity in Stock Room 25-56% 20-50%
Average kWh per Day 48.61 36.98
Average kWh per Month (30 Days) 1458.3 1109.4
Monthly Operating Cost ($.12/kWh) $175.00 $133.13 ($41.87 savings)

Figure 5 shows an energy consumption comparison between the digital controller (shown in light green), and the KE2 Adaptive Control (in dark green).

Figure 5 – Energy Consumption Chart
Digital Controller (February) – Light Green
KE2 Adaptive Control (March) – Dark Green

Comparison Chart - 3392 Freezer DT      February 2017
Digital Controller 

1118 total kWh
(23 days of data)
     March 2017
KE2 Adaptive Control

850 total kWh
(23 days of data)

The KE2 Adaptive Control also eliminated the persistent ice buildup on the coil, and other walk-in surfaces, as shown in Figure 6.  While it is important to maintain an ice free coil from and energy efficiency standpoint, it is equally important to eliminate ice on the floor, which lead to safety issues and liability.

Figure 6 – Ceiling After KE2 Adaptive Control Installed

The icicles that formed while the digital controller was managing the system (as shown in Figure 1) are eliminated, see Figure 6 above. Other surfaces such as the walls, floors, and product, were also free of ice after the KE2 Adaptive Control was installed. In addition to the energy savings, and elimination of ice formation in the walk-in, another feature that PRO was concerned with was ease of installation. The company prides itself on reducing equipment down time for their customers.  Juan Castro, the PRO Service Tech assigned to install the KE2 Adaptive Control, prepped ahead of time,  I watched the YouTube video on ‘How to wire the controller’ the night before, and it really makes it easy.  Draga was also impressed with the ease of installation, The entire process was much easier than I ever thought it would be. The labeled terminal board makes things go very smoothly. We were done, even on our first install, a lot sooner than I thought we would be. According to Draga, the total KE2 Adaptive Control installation took approximately 2.5 hours.


The walk-in experienced 23.93 % energy savings when using the KE2 Adaptive Control. This equates to a savings of $500 annually.  Additionally, by properly managing the defrost cycle, the KE2 Adaptive Control prevents “fogging,” and the resulting ice formations. Using the KE2 Adaptive Control and the KE2 LDA communication device, PRO sees the opportunity to help their customers achieve greater energy savings, as well as easily implement communication and alarming. 

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