According to Guatemala's climate characteristics and geographical environment, the following areas are most suitable for the application of energy recovery ventilation systems (ERV) 

to achieve a balance between energy saving and air quality:

1. Plateau cities and capital areas (such as Guatemala City)

Climate characteristics: tropical dry and wet season climate (Aw) superimposed on subtropical plateau climate (Cwb), with a small temperature difference throughout the year (15-25℃), 

but distinct dry and wet seasons. High humidity in the wet season is prone to mold growth, and outdoor dust increases in the dry season.

ERV adaptability:

Humidity control: ERV can exchange indoor and outdoor air humidity, discharge moisture in the wet season, and introduce outdoor humid air in the dry season to avoid excessive drying.

Volcanic ash protection: adjacent to the active volcanoes of Pacaya and Fuego, frequent volcanic ash pollution (such as the airport was closed many times from 2018 to 2022). 

ERV's high-efficiency filter layer can block PM2.5 and volcanic ash particles to protect indoor respiratory health.

2. Dry Corridor Agricultural Area

Environmental Challenges: It accounts for 10% of the country's land area, with alternating extreme droughts and heavy rains, and serious soil degradation. About 73% of households face food shortages, 

and 46.5% of children are malnourished.

ERV Application Scenarios:

Sustainable Agricultural Facilities: In conjunction with the Kuuxu'rum Agroforestry System, ERVs are installed in greenhouses or storage facilities to reduce ventilation energy consumption 

while maintaining stable temperature and humidity to ensure crop storage environment.

Community Public Space: Schools and medical centers require a constant humidity environment. ERVs can filter sand and dust and recover energy to reduce air conditioning load (local power supply is unstable).

3. Industrial Areas around Volcanoes

Pollution Risk: Volcanic ash from places such as Tajumulco Volcano contains sulfur compounds, which are prone to acid rain, corrode equipment and affect workers' health.

System Optimization Direction:

Industrial Plants: ERVs are combined with corrosion-resistant filter materials (such as activated carbon layers) to adsorb acidic gases; heat recovery reduces the energy consumption of fresh air heating in workshops.

Emergency response: During volcanic eruptions, ERVs can maintain air cleanliness in shelters and reduce reliance on external power supply.

The promotion of ERV systems in Guatemala needs to combine geographical disaster defense (volcanic ash), agricultural resilience (drought) and community health needs, and improve sustainability 

through technology integration.