Energy Efficiency is the use of less energy to perform the same task or produce the same result. It is defined as the use of energy in an optimum manner to achieve the same service that could have been achieved using a less efficient manner. The goal is to reduce the amount of energy required to provide products and services.

Improvements in energy efficiency are generally achieved by adopting a more efficient technology or production process or by the application of commonly accepted methods to reduce energy losses.Decreasing energy use reduces energy costs and results in a financial cost savings for businesses.

Investing in energy efficiency provides businesses with opportunities beyond energy savings. They can optimize and increase productivity, reduce maintenance costs and create safer and more welcoming environments for employees and customers.

Source: Environmental and Energy Study Institute, eesi.org

Energy Efficiency Equipment.

Equipment Minimum requirements
Refrigerators (fridges, freezers, combi fridges/freezers) energy label A++ or better
Air Conditioners energy label A++ or better
LED Lights ≥ 110 lumens/Watt
High pressure sodium lamps ≥ 110 lumens/Watt
Other gas discharge lamps ≥ 57 lumens/Watt

Heating, Ventilation and Air Conditioning - HVAC.

Equipment Minimum requirements
Gas boilers (gas boiler including control system) energy label A++ or better
Biomass stoves/boilers (biomass stoves / boilers including fuel supply system and control system) thermal efficiency ≥ 90%
Balanced mechanical ventilation energy label A or better
HEAT Pumps Minimum requirements (COP)
Water heat pump ≥4,3
Air heat pump ≥4,3
Ground heat pump ≥4,3
Ground water heat pump ≥4,3
Recycled air heat pump ≥4,3
Brine heat pump ≥4,0
SOLAR Water Heaters Minimum requirements
Solar thermal water heaters thermal efficiency ≥75%
Hot water storage tanks energy label C or better

Building Envelope.

EE windows, doors and glazing Minimum Requirements (thermal transmittance U-value)
Windows ≤1,3 W/m2K
Doors ≤1,3 W/m2K
Glazing ≤1,2 W/m2K
Insulation Minimum Requirements (thermal conductivity lambda, λ)
Lamellar structure slabs ≤0,04 W/mK
Styroasphalt sheets ≤0,04 W/mK
Mineral wool ≤0,04 W/mK
Styrofoam (XPS, EPS) ≤0,04 W/mK
Polyurethane ≤0,04 W/mK
Others ≤0,04 W/mK