The Ultimate HVAC Guide: Heating, Cooling & Ventilation for Buildings

Discover modern thermal energy production technologies. Learn how systems that heat your space and water work, focusing on maximum energy efficiency, fossil fuel independence and cost savings.

Heat Pumps

Cutting-edge technology (Air-to-Water & Geothermal) for maximum cost savings and subsidy eligibility.

Condensing Boilers

How recovering heat from flue gases reduces gas or oil consumption by up to 15%.

Domestic Hot Water (DHW)

Choosing the right solution from boilers, solar water heaters and DHW heat pumps.

Biomass & Solid Fuels

Modern pellet boilers, wood pyrolysis and energy fireplaces for homes outside urban centres.

Hybrid Systems

The smart combination of a heat pump with an existing boiler for optimal performance in extreme cold.

PV Combination (Net Metering)

The ultimate strategy to zero out annual heating costs for your property.

See the full section Heat Energy Production.

Managing heat in the Greek summer requires smart and efficient solutions. From modern residential air conditioners to complex central cooling systems and bioclimatic cooling techniques.

Residential AC (Split & Multi)

Correct selection based on BTU, SEER rating analysis and Inverter technology benefits.

Central AC (VRV/VRF)

Professional variable refrigerant flow solutions for large buildings and hotels.

Ducted Systems (Ductwork)

Concealed, high-aesthetic air conditioning with ducts and suspended ceilings.

Water Chillers

Water-cooled and air-cooled heavy-duty systems for industrial and commercial applications.

Passive Cooling

Utilising night purge ventilation and the building's thermal mass.

Shading & Cool Roofs

How proper external shading and cool roof coatings dramatically reduce cooling loads.

See the full section Cooling Energy Production & Air Conditioning.

The 'unsung hero' of every successful HVAC installation. Learn everything about piping, circulators and fittings that ensure seamless water and air distribution without energy losses or annoying noise.

Piping & Insulation

Copper, PEX or multilayer? A materials guide, correct routing and condensation protection.

Hydraulic Balancing

The secret to even temperature distribution in every room (no more cold radiators).

Inverter Circulators & Pressure

The heart of the system, expansion vessels and avoiding destructive cavitation.

Manifolds & Mixing Valves

Correct distribution and regulation of different temperature flows (e.g. underfloor and boiler).

Air Tightness (Blower Door Test)

How to properly seal pipe penetrations so the passive building doesn't leak.

Protection & Safety

Water hammer, magnetic particle filters, safety valves and air separators.

See the full section Hydraulic Networks & Energy Distribution.

The final and most visible stage of energy transfer inside the space. Construction guides, sizing and terminal unit selection for optimal thermal comfort and aesthetic integration.

Underfloor Heating

Ultimate comfort. Layering, screed, expansion joints and dry-build solutions.

Underfloor Cooling

How it works in summer, the importance of the dew point and dehumidifiers.

Fan Coils (FCU)

Exposed floor-standing or concealed ceiling units? Operation, condensate drainage and noise management (dB).

Radiators

Correct selection (Panel/AKAN) and sizing to work with low-temperature heat pumps.

Thermostatic Radiator Valves (TRVs)

Room-by-room autonomy with local temperature control directly on the radiator.

Special Emission Applications

Ceiling/wall heating and cooling, skirting heating and trench heaters.

See the full section Emission Systems: Underfloor, Fancoils & Radiators.

The air we breathe plays a decisive role in our health. Explore technologies and methods for air renewal, pollutant removal and humidity control in modern, airtight buildings.

Natural & Local Ventilation

Cross ventilation, correct bathroom extractor selection and kitchen hood sizing.

Heat Recovery (HRV/ERV)

The building's 'breath'. Air renewal without losing indoor warmth or coolness.

Air Handling Units (AHU)

Ventilation and air mixing systems for large commercial spaces and industry.

Humidity & CO2 Control

How carbon dioxide levels and VOCs cause 'Sick Building Syndrome' (SBS).

Air Filtration

Filter categories (from G4 to HEPA) and their role in trapping dust, viruses and allergens.

Air Purifiers & Ionisers

When they actually work, what activated carbon is and how UV-C lamps function.

See the full section Ventilation & Indoor Air Quality (IAQ).

The 'brain' of your installation. Discover how modern controls, from a simple digital thermostat to complex Smart Home systems, provide ultimate comfort and dramatic energy savings.

Thermostats & PID Controllers

How modern digital thermostats 'learn' the space and prevent wasteful consumption.

Weather Compensation

The autopilot that adjusts heating water temperature based on how cold it is outside.

Zoning

Complete freedom with different temperatures in each room via motorised valves and dampers.

Smart Wi-Fi Thermostats

Remote control, geofencing and management via smartphone apps.

Smart Home & Ecosystems (BMS)

How HVAC integrates with KNX, Zigbee or Home Assistant systems.

Energy Monitoring

Live energy monitoring for cost control and dynamic electricity tariff optimisation.

See the full section Automation, Controls & BMS .

The scientific and economic background before installation. Understand how the building envelope, insulation and legislation absolutely determine the size, cost and performance of equipment.

Building Envelope & Passive House (Passivhaus)

Eliminating thermal bridges, energy-efficient windows and the super-insulation rule.

Load & Loss Calculations

How buildings are scientifically studied and why oversizing destroys equipment.

KENAK & nZEB Legislation

What the law requires for new buildings, Energy Performance Certificates (EPC) and renovations.

Subsidies & Incentives

Which HVAC systems qualify for funding and what the eligibility criteria are.

Economic Analysis

Calculating the true cost per kWh (Electricity vs Natural Gas vs Oil vs Pellet).

ROI & Life Cycle Cost (LCC)

Calculate how many years it takes to recoup your investment in a heat pump.

See the full section Energy Design, Studies & Legislation.

Theory meets practice (on the job site). A practical guide to successful retrofits, proper installation protocols, regular maintenance and quick diagnosis of common faults.

Retrofit Challenges

Replacing an old boiler, heat pump with old radiators and underfloor heating over existing tiles.

Commissioning Protocols

Creating vacuum in AC systems, pressure testing and the 5 essential start-up settings.

Network Hygiene & Safety

Did you know about Dry Traps? How to prevent odours, outdoor pipe freezing and Legionella.

Network Flushing

How chemical sludge cleaning saves the circulator and restores radiator performance.

Regular Maintenance

Annual boiler checks (flue gas analysis), filter cleaning and expansion vessel inspection.

Troubleshooting

Why is the radiator half cold, how to bleed properly and why the heat pump defrosts frequently.

See the full section Retrofitting, Installation & Troubleshooting .