Rénovation Énergétique et KNX

The Urgency of Energy Renovation in Luxembourg

Faced with soaring energy prices and climate challenges, energy renovation has become an absolute priority for Luxembourg property owners. The government has set ambitious targets: reduce CO₂ emissions by 55% by 2030 and reach carbon neutrality by 2050.

In this context, KNX stands out as the reference technology for optimising your home's energy performance. Far more than a simple smart-home system, KNX is the intelligent brain that maximises the efficiency of all your energy equipment.

Concrete Results with KNX

-50%

Energy consumption

5-8 years

Return on investment

+15%

Property value

Why Integrate KNX into Your Energy Renovation?

1. Intelligent optimisation of all energy areas

KNX intelligently coordinates all your equipment to maximise energy savings without sacrificing comfort:

Smart heating (50% of savings)

Room-by-room regulation based on occupancy
Heat pump and boiler integration
Weather-based optimisation
Intelligent underfloor heating management

Lighting and appliances (30% of savings)

LED lighting with presence detection
Automatic dimming based on brightness
Automatic appliance switch-off
Hidden standby management

2. Perfect integration with renewable energy

KNX maximises the profitability of your renewable energy installations:

Intelligent self-consumption management

Photovoltaic panels

• Self-consumption optimisation
• Triggering of energy-intensive appliances
• Intelligent battery charging
• Automatic surplus feed-in

Heat pump

• Operation during off-peak hours
• Weather anticipation
• Intelligent thermal storage
• Coupling with solar generation

3. Real-time energy monitoring

KNX gives you full visibility on your energy consumption, allowing you to immediately identify waste and optimise your behaviour:

Smart meters : Detailed tracking by consumption area
Automatic alerts : Notifications in case of over-consumption
Detailed history : Trend analysis and comparisons
Personalised recommendations : Optimisation suggestions

KNX in Your Energy Renovation Project

Step 1: Energy audit and design

Before any KNX installation, we conduct a full energy audit of your property to identify loss areas and define the most effective optimisation strategy.

Our Audit Methodology

Thermal analysis

• Infrared thermography
• Air-tightness test
• Loss calculations
• Complete thermal balance

Energy analysis

• Audit of existing equipment
• Consumption measurements
• Savings potential
• Optimisation scenarios

Step 2: Coordinated installation

The KNX installation fits perfectly into your renovation schedule, in coordination with the other trades:

Phase 1 - Structural works : Running KNX cables with the electrics
Phase 2 - Equipment : Installing boiler, heat pump, MVHR
Phase 3 - KNX : Fitting actuators and sensors
Phase 4 - Programming : Configuration and commissioning
Phase 5 - Training : Handover to occupants

Step 3: Continuous optimisation

After installation, KNX keeps learning and optimising to maximise your energy savings through integrated artificial intelligence.

Return on Investment and Financing

Profitability Calculation

Concrete example: 150 sqm house (Luxembourg)

Situation before renovation

• Energy bill: €3,500/year
• Energy class: E or F
• CO₂ emissions: 12 tonnes/year

After renovation with KNX

• Energy bill: €1,800/year
• Energy class: A or B
• CO₂ emissions: 4 tonnes/year
• Savings: €1,700/year

Financial aid available in 2025

Luxembourg offers many grants to finance your energy renovation with KNX:

National aid

• Renovation tax credit: Up to €5,000
• Energy bonus: €1,500 - 3,000
• Heat pump subsidy: €2,000 - 4,000
• PV aid: €500/kWp

Local aid

• Municipal subsidies: €500 - 2,000
• Climate loan 0%: Up to €100,000
• Reduced VAT: 3% on materials
• Tax deduction: 50% of costs

KNX: Compatibility with Existing Systems

One of the great advantages of KNX in renovation is its ability to adapt to the existing electrical installation. Several solutions are possible depending on your situation:

Wired solution (optimal)

Installation of a dedicated KNX bus (green cable)
Maximum performance and absolute reliability
Ideal during a full electrical renovation

Hybrid solution (balanced)

Combination of wired KNX and wireless (KNX RF)
Partial reuse of existing wiring
Good cost/performance compromise

Wireless solution (economical)

Exclusive use of KNX RF
No new wiring needed
Fast, low-impact installation

Use case: Successful energy renovation

200 sqm villa in Strassen - 2024 renovation

Works carried out

• Enhanced thermal insulation
• Air/water heat pump
• 8 kWp photovoltaic panels
• Complete KNX system
• Double-flow MVHR

Results achieved

• Consumption: -65% (€4,200 → €1,500/year)
• Energy class: F → A
• ROI: 6.5 years with aid
• Value increase: +22% (€180k on €800k)
• Comfort: very significantly improved

Frequently Asked Questions (FAQ)

How much can you save with KNX in an energy renovation?

KNX can reduce energy consumption by 30 to 50% depending on the property. On a €2,000/year bill, that represents €600 to €1,000 in annual savings.

Is KNX eligible for energy renovation aid?

Yes, KNX energy management systems are eligible for the energy renovation tax credit (up to €5,000) and Luxembourg municipal subsidies.

Can KNX be installed in a renovation without redoing the electrics?

Yes, KNX can often be installed while keeping part of the existing electrical installation, notably with KNX RF wireless solutions that do not require new cabling.

What is the profitability of a KNX system in a renovation?

With energy savings and financial aid, a KNX system is generally paid back in 5 to 8 years, while enhancing the property's value.

Conclusion

Integrating KNX into your energy renovation project is no longer a luxury but an economic and ecological necessity. This technology lets you maximise the benefits of your investments in insulation, heating and renewable energy.

With energy savings of up to 50%, substantial financial aid and guaranteed property value increase, KNX turns your energy renovation into a profitable and sustainable investment. Take the step towards optimal energy efficiency today.

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Energy Renovation: Why Choose KNX?