Guide to Insulation, Windows and Heating Upgrades for an Energy‑Efficient Home
Learn the expert steps for insulation, window and heating upgrades tailored to Istanbul’s climate and building types.
2026-08-01 · 5 min read
Istanbul’s humid winters and hot summers drive up household energy use. Proper insulation, high‑performance windows, and modern heating systems cut costs and boost comfort. This guide walks you through every step, local regulations, and practical tips.
1. Condition Assessment and Free On‑Site Survey
Güven Kardeşler documents the building’s age, façade finish, roof type (tile, membrane, steel) and existing heating system. In Istanbul, post‑1990 apartments often require exterior insulation; the report flags this.
- •Thermal imaging to map heat loss
- •Measurement of current glazing thickness and frame material
- •Heat loss calculation (kW/m²) and budget estimate
2. Exterior Wall and Roof Insulation
In Istanbul, exterior insulation typically uses 5‑10 cm EPS or XPS boards combined with a vapor‑proof aluminum façade system. Roofs are insulated with lightweight stone wool (120‑150 mm) under a waterproof membrane.
- •Surface prep: cleaning, crack filling, primer coat
- •Fixing insulation boards with adhesive and mechanical fasteners
- •Installing waterproof membrane and exterior cladding
3. Window Replacement – Double Glazing and Frame Choice
In Istanbul, low‑emissivity double glazing with a 16‑18 mm thickness and U‑value of 1.1‑1.3 W/m²K reduces condensation. PVC‑U or wood‑aluminum hybrid frames are recommended to minimize thermal bridging.
- •Measuring existing opening dimensions (height, width, depth)
- •Installing insulated glazing and frame, checking fasteners and seals
- •Insulating the ventilation bar and exterior sill
4. Heating System Modernization
While natural gas is common in Istanbul, an air‑to‑water heat pump (ASHP) offers 3‑4 kW heating for 1 kW electricity, yielding 300‑400 % efficiency. Old boilers typically operate at 70‑80 % efficiency.
- •Heat‑pump sizing (building envelope, heat loss, climate factor)
- •Adapting radiators or floor heating for low‑temperature operation
- •Installing smart thermostat and energy monitoring
5. Legal Requirements and Documentation
Istanbul Metropolitan Municipality’s ‘Energy Efficiency Regulation’ (2022) mandates performance certificates for façade insulation and window replacement. Güven Kardeşler provides EIA reports, heat‑loss calculations, and CE‑marked product documentation.
- •Permit application: municipal energy‑efficiency form
- •Post‑installation inspection and energy‑saving report
- •Written warranty and maintenance plan approval
Frequently Asked Questions
- How much does interior temperature rise after insulation?
- Typically a 3‑5 % increase; with the same heating output indoor temperature stays 5‑7 °C higher.
- What portion of the budget does double‑glazed windows represent?
- Usually 30‑40 % of the total renovation budget goes to windows, varying with the number of openings and frame material.
- Does a heat‑pump installation require additional home infrastructure?
- Yes; you need a suitable outdoor unit location, a radiator/floor‑heating adapter, and a dedicated 16‑20 A circuit breaker.
- Are there government incentives for energy‑efficiency upgrades?
- In Istanbul, the ‘Energy Efficiency Credit’ and ‘Housing Renovation Support Program’ offer interest‑reduced loans covering 20‑30 % of insulation and heat‑pump costs.
Planning a renovation?
Free survey, written fixed price, contract and warranty. No obligation — see the price first, then decide.