What is the patented Demand Limiting Controller (DLC)?

While most businesses are well aware of the costs of energy, many don’t realize how much control they can potentially have over their utility expenses. Electricity, in particular, is often overlooked as a manageable expense. 

The Save Energy Systems patented Demand Limiting Controller (DLC) is a cost-saving product designed specifically to reduce demand charges associated with HVAC.

By providing precision temperature control of HVAC systems, our DLC technology ensures Savings, Comfort and Control – all at the same time. It’s perfect for businesses such as health clubs, auto dealers, retailers, offices and distribution/logistics warehouses. By installing the DLC, our customers can take advantage of the same energy-saving techniques employed by big corporations (at a fraction of the price) and efficiently manage the equipment that’s the largest component of their energy bill...              the HVAC system.

We have found that the typical installation pays for itself in approximately 18 months and customers save up to 30%, annually, on energy costs, one of their greatest monthly expenditures. Not only do our customers experience measurable benefits to the bottom line but they also greatly help to reduce pollution


So, How Do We Do It?

The DLC is connected to all thermostats in a facility including zone and supply sensors while communicating via internet with the local weather station for temperature. We constantly monitor what’s occurring in each zone, HVAC unit and outside temperatures.

This next piece is critical - We input the energy use of each component for each roof top unit (or split) into the DLC, including each compressor and evaporator fan. We now have the energy consumption of the HVAC system.

Savings goal - We set the DLC to reduce Demand (the total energy consumed by the HVAC units) by 20%. We call it a goal because on a hot day we’ll let the HVAC systems run without limitations,  to provide the highest level of comfort. 

Manage to one degree - The DLC manages each zone to within one degree, broken down into tenths.

Actually reduce energy consumption - Before the DLC turns on a rooftop unit to cool or heat it checks to see if there is enough power available under the Demand limit.  If so, it turns the unit on.  If not, it looks at the temperature in each zone to determine if it within its “comfort zone” (within 1 degree of its set point).  If it is, it will then turn off the unit to provide more power under the Demand limit. The DLC will shut off one or more components in one or more units to accommodate turning on the next unit. This process allows for an HVAC unit to be turned on with no net increase in energy consumption resulting in a decrease in Demand and overall energy consumption and saving you money. 


Save Up To 30% On Energy, Annually

HVAC energy costs represents up to 50% of a commercial facility’s energy usage. 

Save Energy System’s patented DLC is specifically designed to address the following components of an electric utility bill:

  1. Usage - The total amount of electricity (kWh) consumed over a 30 day billing cycle.
  2. Demand - The rate at which energy is consumed.
  3. Demand Charge - An additional fee to address the rate at which a facility consumes energy. It covers the cost of equipment necessary to provide uninterrupted power to your facility, no matter when or how much used, recalculated each month, based on the peak energy used each month (Rate of Consumption).

Running all HVAC units simultaneously represents the highest consumption of energy and the greatest demand. The DLC’s goal is to keep the HVAC rooftop units from running simultaneously, while keeping the facility comfortable. 


The DLC Delivers Energy Savings But Never At The Expense Of Comfort

The Save Energy Systems DLC is an intelligent, networked system that manages a facility to a one degree comfort zone. This one degree comfort zone is broken into tenths of a degree for precise adjustments. Although the DLC’s goal is to reduce energy usage, it never sacrifices comfort over savings. In extreme weather, the DLC will prioritize comfort over savings, allowing all HVAC units to perform to their fullest capabilities simultaneously.

  • Manages temperature without compromising comfort
  • Prevents all units from running simultaneously, whenever possible
  • Manages fan and compressor(s) independently
  • Scheduled daily setbacks for unoccupied times
  • Scheduled holiday setbacks
  • Smart Start
  • Built-in small system economizer feature
  • Precise temperature control


The DLC Provides Intelligent Energy Management

And Precise Environmental Control

The Save Energy Systems DLC system has a comprehensive view across all your sites and units that can be accessed from a PC or mobile device. The DLC knows the exact power consumption for each component, monitors all HVAC units installed at a facility, and then determines how best to minimize the energy consumption of each based on the temperature in each zone. For example, if it looks like energy consumption will exceed a specific power level at any time, the DLC can adjust the temperature within a zone, turning it off to allow another zone to turn on, ensuring peak power is kept below a defined limit. Since the DLC has a system-wide view, it knows which units are currently maintaining conditions within the set comfort zone, which are not, and how best to respond while ensuring overall energy demand does not exceed the threshold.  


  • Multi-site central control-Portal
  • Color coded, simplified view of each site
  • Easy to make, temporary zone temperature adjustments
  • Outbound notifications via E-mail and SMS
  • Manage up to 254 thermostats per site
  • No monthly fee