1. Different core functions of the integrated fresh air unit: ventilation and air treatment (such as filtration, heat recovery, dehumidification, etc.). Core objective: To filter fresh outdoor air and introduce it into the indoor environment, while removing polluted indoor air to maintain fresh air and appropriate humidity. Some models can also adjust the temperature (auxiliary cooling/heating). Common types: Full heat exchange fresh air, one-way flow fresh air, integrated fresh air conditioning units with cold and hot modules, etc. Underfloor heating function: indoor heating. Core objective: To uniformly heat the room through ground radiation and heat dissipation, and increase the indoor temperature in winter. It is only used for heating and does not involve ventilation. Common types: water underfloor heating (boiler heating hot water circulation), electric underfloor heating (heating cable or electric heating film). 2. Different working principles: The integrated fresh air unit forcibly replaces air through the fan and pipeline system, and may have a heat recovery function (recovering heat/cold from the exhaust to reduce energy consumption). Some high-end models integrate air conditioning functions, but the main advantage is still ventilation. Underfloor heating: The boiler heats water and circulates it through pipes buried underground to dissipate heat. Electric underfloor heating: Electric energy is directly converted into heat energy and radiated through heating materials. 3. The installation and structure of the integrated fresh air unit require the installation of ventilation ducts (possibly through beams or suspended ceilings), and the main unit is usually installed on balconies, bathrooms, or kitchens. The design of air vents (inlet and outlet) has a relatively small impact on the height of the building. Underfloor heating requires laying pipes or heating cables on the ground, covering insulation layers, reflective films, etc., occupying 5-10cm of floor height. After installation, cement needs to be backfilled, which is suitable for pre decoration planning. 4. Applicable scenarios: The new air integrated machine solves the air quality problems in enclosed spaces, such as formaldehyde, high CO ₂, and PM2.5 pollution. Suitable for areas with high ventilation requirements, such as areas with severe haze or humidity. Underfloor heating solves the heating needs in winter, especially suitable for cold regions or families who pursue comfortable foot feel. It is necessary to cooperate with other refrigeration equipment (such as air conditioning) to achieve summer cooling. 5. Energy consumption and cost: The integrated fresh air unit has lower power consumption (about 50-200W/hour for ordinary household models), and models with heat recovery function are more energy-efficient. The initial installation cost is about 10000-30000 yuan (depending on the size and function of the house). The cost of underfloor heating water and gas is relatively high (depending on boiler energy efficiency), and the operating cost of electric underfloor heating is even higher. The initial installation cost is about 20000 to 50000 yuan (taking 100 square meters as an example), and later maintenance may involve pipeline cleaning.