GTOT and Solar Shading: How to Evaluate Energy Efficiency

The GTOT value is a fundamental parameter for measuring the energy efficiency of solar shading. Let's see together what it means in concrete terms and how it can affect the energy savings of your home.

What is GTOT: Practical Definition

GTOT (Total Solar Transmittance) measures how effectively a solar shading system, in combination with the window glass, blocks the sun's heat.

This value is expressed on a scale from 0 to 1:

• Values ​​closer to 0 indicate greater protection
• Values ​​closer to 1 indicate less protection

For example, a GTOT of 0.30 means that only 30% of the solar energy manages to penetrate the glass-shade combination.

The Importance of GTOT for Your Home

Practical Benefits

• Internal temperature control
• Reducing air conditioning costs
• Greater living comfort
• Protecting furniture from the sun's rays

Economic Benefits

• Reduction of energy consumption
• Access to 50% tax deductions
• Property enhancement

Official Classification UNI EN 14501

The regulation defines 5 performance classes of solar screens:

Class 4 - Optimal Performance

• GTOT < 0.10
• Maximum sun protection
• Ideal for large south-facing windows

Class 3 - High Performance

• GTOT between 0.10 and 0.15
• Very effective protection
• Recommended for very sunny areas

Class 2 - Moderate Performance

• GTOT between 0.15 and 0.35
• Intermediate protection
• Suitable for moderate exposures

Class 1 - Basic Performance

• GTOT between 0.35 and 0.50
• Minimum protection
• For areas with low sun exposure

Class 0 - Poor Performance

• GTOT ≥ 0.50
• Very limited protection
• Not recommended for energy efficiency purposes

How to Access Tax Deductions

Technical Requirements

1. GTOT ≤ 0.35
2. Certified technical documentation
3. Professional installation

Deduction Process

• Refund of 50% of the expense incurred
• Deduction in 10 annual installments
• Complete documentation required

Factors to Consider When Choosing

Building Analysis

• Window orientation
• Climate zone
• Total glass surface
• Natural lighting needs

Technical Features

• Shielding type
• Materials used
• Ease of maintenance
• Durability over time

Myth Consulting Service

We offer professional support for:

1. Assessment of specific needs
2. Calculating the optimal GTOT
3. Choosing the most suitable shielding
4. Documentation for deductions

Conclusions

The GTOT value is an essential technical parameter that directly influences:

• Energy efficiency of the building
• Living comfort
• Economic savings
• Access to tax incentives

To get the maximum benefits, it is essential to:

• Carefully evaluate your needs
• Choose certified products
• Trust qualified professionals
• Keep all technical documentation

Contact us for a personalized technical consultation and discover the most efficient solutions for your home.