How the Sí-Climate System Works (Technology Explained Simply)

Sí-Climate System – Modular Technology Platform

SíAir – Zero-Energy Cooling

Natural building cooling without electricity, compressors or chemicals – using earth air, water and physics.

SíWater – Water & Thermal Storage

A cistern-based system that stores water, cold and heat – pressureless, durable and fully independent.

SíSand – Seasonal Heat Storage

Long-term storage of large energy volumes in quartz sand at 40–600°C – ideal for PV surplus and industrial waste heat.

SíVillage – Autonomous Villages & Workforce Camps

Modular, self-sufficient settlements with 15–30 units – cooling, heating and water fully integrated.

SíHouse – Autonomous Homes

Modular buildings with a modern stone-house look, powered entirely by Sí-System modules.

Spryox – PU Coating Systems

Professional PU sprays, foams and coating systems for construction, energy and storage integration.

SíAir – Zero-Energy Cooling & Heating

A System Based 100% on Real Natural Principles

SíAir is a fully passive climate and thermal system that cools and stabilizes indoor temperatures without electricity, compressors or refrigerants.

It uses constant ground temperatures and water-based thermal storage to deliver noticeable cooling even under extreme heat - year-round, low-maintenance and completely off-grid.

How it works

- Outside air is drawn through a buried earth duct, taking on the natural ground temperature.

- A water cistern acts as a thermal buffer and stabilizes indoor climate day and night.

- Wind-induced inlet modules and an aerodynamic exhaust tower generate continuous airflow - without any moving parts.

- Only during absolute wind & solar stagnation does a small 10–20 W PV micro-fan assist the airflow.

Key advantages

- Near-zero-energy cooling, even at

35–45°C outdoor temperatures

- No refrigerants, no compressors, no wear and tear

- Stable indoor humidity – hygienic & mold-free

- Works in homes, resorts, stables, storage, agriculture and off-grid buildings

- Ideal for high-heat regions with expensive cooling (Mediterranean, Africa, South America, Australia, Southern USA)

What makes SíAir unique

SíAir does not rely on individual parts - it is a fully synchronized system of ground-air volume, thermal mass, airflow resistance and natural convection.

This creates a self-regulating climate system with no degradation, no mechanics and virtually no energy demand.

SíAir is the low-tech alternative to air conditioning and heat pumps - robust, affordable and perfect for autonomous buildings.

SíSand – Seasonal Heat Storage

Store Summer Heat. Use It in Winter.

SíSand stores heat in pure quartz sand — pressureless, chemical-free and almost maintenance-free.

- PV surplus or industrial waste heat is stored at 300–600°C

- Heat is retained for weeks to months

- Energy is released in winter or at night to support heating systems

SíSand is modular, extremely long-lasting and independent of global supply chains.

Ideal for buildings, villages and off-grid projects requiring stable, predictable heating without fossil fuels.

Because sand remains thermally stable, large energy volumes can be stored compactly.

Even small systems significantly reduce gas and electricity demand.

The technology works purely on physics, contains no moving parts and offers exceptionally long lifetime.

SíSand integrates easily into existing heating systems - old gas, oil or biomass boilers can remain in use and be supplemented.

Suitable for homes, commercial buildings, agriculture and seasonal energy projects requiring long-duration heat storage.

SíVillage – Autonomous Villages & Workforce Camps

SíVillage combines the Sí-Climate System with modular architecture to create fully self-sufficient settlements - ideal for hotels, municipalities and development regions.

A village typically includes 15–30 premium housing units (72–144 m²), outdoor kitchens, covered terraces and community spaces - all independent of external energy, water and wastewater infrastructure.

Core technology

- SíAir provides natural cooling without AC

- SíSand stores summer heat for winter

- Large water and hot-water cisterns provide supply, fire safety and microclimate

- A 48-V PV microgrid delivers safe, maintenance-free power for lighting, pumps and essential loads

All systems operate pressureless, robust and without chemical batteries.

Benefits

For hotels:

- Immediate workforce housing without burdening municipal grids

- Fast permitting due to reversible constructionNo long-term operating costs

For municipalities:

- Relief of local housing markets

- Reduced traffic pressure

- Sustainable infrastructure without political risk

For residents:

- Comfortable, cool indoor climate

- Hot water and essential services at near-zero cost

In development regions, SíVillage adds income, food security and local industry:

energy management, gardening, repair services, cistern construction, biogas, seedling production and more.

SíVillage is scalable, modular and deployable worldwide - from Europe to Africa, Asia and Latin America.

Sí-House – Autonomous Homes for Any Climate

Sí-House combines a highly durable container-frame structure with the warm aesthetics of a Mediterranean stone house.

The modules are factory-built, assembled on-site and fully compatible with all Sí-Climate components:

- SíAir for zero-energy cooling & heating

- SíWater for thermal buffering & cold storage

- SíSand for seasonal heating

This allows Sí-Houses to reach up to 95% energy self-sufficiency - without complex technology, battery limits or rare materials.

The buildings are earthquake-resistant, stormproof, highly insulated and visually customizable with stone, plaster or modern façades.

Large windows, open layouts and optional outdoor-living zones create bright, modern spaces.

Thanks to modular design, units can be expanded, combined or operated as a full cluster.

Ideal for living, remote work, staff housing and off-grid installations.

Spryox

PU/Polyurea Technology for Sealing & Thermal Optimization

Spryox is our brand for professional PU and polyurea coatings, spray foam systems and full equipment solutions.

The systems create high-strength, seamless waterproofing for roofs, cisterns, foundations and storage structures - chemical-resistant, UV-stable and extremely durable.

PU spray foam provides thermal insulation, cavity filling and structural reinforcement.

Spryox delivers materials, machinery and service from a single source:

mobile spray units, heating stations, high-pressure pumps, hoses, guns and safety equipment.

The coating cures within seconds, forms a seamless membrane and integrates perfectly with SíAir, SíWater or storage modules.