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Since 2014 Wohnraum German Windows is your premier destination for high-quality imported windows and doors in Indonesia.

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Creating Comfort with soundproof and energy efficient windows

Wohnraum German Windows specializes in importing and distributing some of the most soundproof and energy-efficient doors and windows in Indonesia. With a keen awareness of the growing importance of energy efficiency and noise management in residential and commercial spaces, we continuously explore cutting-edge technologies in the construction industry.

We understand the frustrations faced by property owners with extreme heat, persistent street noise, and subpar product quality.

At Wohnraum, we aim to alleviate these concerns by offering high-performance products previously unavailable in the Indonesian market. Our vision is to introduce advanced technologies and trends to Indonesian consumers, ensuring they have access to the best solutions available worldwide.

```html

<!DOCTYPE html>

<head>

<title>SmartGlass ROI Calculator</title>

<style>

.calculator-container {

font-family: 'Arial', sans-serif;

max-width: 500px;

margin: 0 auto;

padding: 20px;

border-radius: 10px;

box-shadow: 0 0 15px rgba(0,0,0,0.1);

background: #f9f9f9;

}

h2 {

color: #2A5C9A;

text-align: center;

}

.input-group {

margin-bottom: 15px;

}

label {

display: block;

margin-bottom: 5px;

font-weight: bold;

color: #333;

}

input, select {

width: 100%;

padding: 10px;

border: 1px solid #ddd;

border-radius: 5px;

box-sizing: border-box;

}

button {

background: #4CAF50;

color: white;

border: none;

padding: 12px 20px;

width: 100%;

border-radius: 5px;

cursor: pointer;

font-size: 16px;

margin-top: 10px;

}

button:hover {

background: #3e8e41;

}

#results {

margin-top: 20px;

padding: 15px;

background: #e8f5e9;

border-radius: 5px;

display: none;

}

.result-item {

margin-bottom: 10px;

}

.highlight {

font-weight: bold;

color: #2A5C9A;

}

</style>

</head>

<body>

<h2>SmartGlass ROI Calculator</h2>

</div>

<label for="glassArea">Glass Area (m²):</label>

</div>

<label for="electricityRate">Electricity Rate (Rp/kWh):</label>

</div>

<label for="acUsage">Daily AC Usage (hours):</label>

<option value="8">8 hours/day</option>

<option value="12">12 hours/day</option>

</select>

</div>

<button onclick="calculateROI()">Calculate My Savings</button>

<h3>Your Potential Savings</h3>

Annual Energy Savings: <span class="highlight" id="annualSavings">0</span> kWh

</div>

Annual Cost Savings: Rp <span class="highlight" id="costSavings">0</span>

</div>

AC Capacity Reduction: <span class="highlight" id="acReduction">0</span> PK

</div>

Payback Period: <span class="highlight" id="payback">0</span> years

</div>

10-Year Profit: Rp <span class="highlight" id="tenYearProfit">0</span>

</div>

function calculateROI() {

// Get user inputs

const area = parseFloat(document.getElementById('area').value);

const glassArea = parseFloat(document.getElementById('glassArea').value);

const electricityRate = parseFloat(document.getElementById('electricityRate').value);

const acUsage = parseInt(document.getElementById('acUsage').value);

// Constants (based on your case study)

const U_SINGLE = 5.0;

const U_DOUBLE = 1.25;

const SHGC_SINGLE = 0.8;

const SHGC_DOUBLE = 0.52;

const TEMP_DIFF = 6; // ΔT (30°C outdoor - 24°C indoor)

const SOLAR_IRRADIANCE = 500; // W/m²

const HOURS_PER_YEAR = acUsage * 365;

const AC_COST_PER_PK = 17500000; // Rp 17.5 juta/PK

const KW_TO_PK = 0.735;

// Calculations

// 1. Heat gain reduction (kW)

const conductiveSavings = (U_SINGLE - U_DOUBLE) * glassArea * TEMP_DIFF / 1000;

const solarSavings = (SHGC_SINGLE - SHGC_DOUBLE) * glassArea * SOLAR_IRRADIANCE / 1000;

const totalHeatReduction = conductiveSavings + solarSavings;

// 2. Energy savings (kWh/year)

const annualEnergySavings = (totalHeatReduction * HOURS_PER_YEAR) / 3.0; // Assuming COP=3.0

// 3. Cost savings (Rp/year)

const annualCostSavings = annualEnergySavings * electricityRate;

// 4. AC downsizing (PK)

const originalCoolingLoad = area * 0.1; // 100W/m² → 0.1kW/m²

const newCoolingLoad = originalCoolingLoad - totalHeatReduction;

const acReductionPK = (originalCoolingLoad - newCoolingLoad) / KW_TO_PK;

// 5. Financials

const glassUpgradeCost = 900000000; // Rp 900 juta

const acCostSavings = acReductionPK * AC_COST_PER_PK;

const netInvestment = glassUpgradeCost - acCostSavings;

const paybackYears = netInvestment / annualCostSavings;

const tenYearProfit = (annualCostSavings * 10) - netInvestment;

// Display results

document.getElementById('annualSavings').textContent = annualEnergySavings.toLocaleString('id-ID', {maximumFractionDigits: 0});

document.getElementById('costSavings').textContent = annualCostSavings.toLocaleString('id-ID', {maximumFractionDigits: 0});

document.getElementById('acReduction').textContent = acReductionPK.toLocaleString('id-ID', {maximumFractionDigits: 1});

document.getElementById('payback').textContent = paybackYears.toLocaleString('id-ID', {maximumFractionDigits: 1});

document.getElementById('tenYearProfit').textContent = tenYearProfit.toLocaleString('id-ID', {maximumFractionDigits: 0});

document.getElementById('results').style.display = 'block';

}

</script>

</body>

</html>

```

Window, door and garage door in a matching design

Full range of products

Our offer, includes windows, doors, sliding systems, sun protection, mosquito screens, garage doors, and many more.

We supply windows and doors made from UPVC, aluminum and steel.

PRODUCTS

UPVC and Aluminium window samples with soiund pictograms

Soundproof windows and doors

Our speciality are windows and doors that help to reduce noise entering the building. We have several options and specifications available.

SR-WINDOWS

Commitment to quality

As importers of premium windows, our commitment to quality is unwavering. While we may not manufacture the products ourselves, our dedication to delivering excellence remains paramount in every aspect of our operations.

We select the right products for the local indonesian market, we have experience to evaluate each product to ensure it meets our exacting standards for durability, performance, and aesthetics.

*Wohnraum has the perfect weld for UPVC windows as standard.

Complete solution for large sliding and bifold systems.

SUNFLEX has a range of products which meet the most demanding requirements in terms of quality, function and design and can also be adapted to individual needs. The motivation of offering customers maximum performance and reliability is our driving force.

Designed to perfection and manufactured regional for SUNFLEX GmbH in Germany.

German windows with Tilt & Turn system

WOHNRAUM German Windows typically open to the inside! The German Tilt&Turn system offers versatility and functionality, making it a popular choice for modern homes.

With this innovative design, a single window can be opened in two distinct ways: tilting inwards (open at the top to the inside) for ventilation or swing open to the side for easy cleaning and access.

WOHNRAUM Project in Seminyak, Bali: Highest specifiaction in terms of soundproofing and sun protection.

WOHNRAUM Project in Menteng, Jakarta Selatan: High specifiaction in terms of soundproofing and energy efficieny.

WOHNRAUM Project in Jimabran, Bali: Stunning wood decors to blend ion with the natural teak wook and stone finishes.

WOHNRAUM Project in Lippo Karawaci: Elegand white UPVC frames with insulated double glazing.

WOHNRAUM Project in South Jakarta: A mix of white and blck UPVC frames with insulated double glazing.

WOHNRAUM Project in Kuningan, Jakarta Selatan: White UPVC windows with insulated double glazing.

WOHNRAUM Project in Gading Serpong: White UPVC windows with insulated triple glazing.

PHOTO GALLERY

Why WOHNRAUM?

We collaborate with the best manufacturers and will execute your project with the utmost dedication and care.

PRODUCTS

MATERIALS

ACCESSORIES

Creating Comfort with soundproof and energy efficient windows

We understand the frustrations faced by property owners with extreme heat, persistent street noise, and subpar product quality.

At Wohnraum, we aim to alleviate these concerns by offering high-performance products previously unavailable in the Indonesian market. Our vision is to introduce advanced technologies and trends to Indonesian consumers, ensuring they have access to the best solutions available worldwide.

We select the right products for the local indonesian market, we have experience to evaluate each product to ensure it meets our exacting standards for durability, performance, and aesthetics.

Showroom at Ruko Malibu C6, BSD City

Why WOHNRAUM?