Release Type: Technical Insight
Date: June 23, 2026
Target Markets: Russia (Arctic cold), Southeast Asia/West Africa (Tropical heat), Middle East (Arid heat)
The global poultry industry faces escalating climate challenges. From Siberia's -40°C winters to Southeast Asia's 35°C / 85% RH tropical conditions, standardized poultry house designs no longer meet regional operational requirements. This article compares key design parameters for extreme cold versus extreme humid-heat climates, drawing on published academic literature and industry standards, to provide technical reference for B2B equipment selection.
According to poultry science textbooks, poultry houses fall into three basic types:
| House Type | Definition | Suitable Climate |
|---|---|---|
| Open house | Relies on natural ventilation and natural light; low cost, low energy consumption | Warm climates; not suitable for extreme cold |
| Closed house (environmentally controlled) | Windowless; artificial lighting + mechanical ventilation; fully power-dependent | Extreme cold/heat; requires good insulation |
| Open-closed hybrid | Equipped with windows; switchable between natural and mechanical ventilation | Temperate climates with seasonal extremes |
Selection principle: For extreme cold regions (Russia, Northeast China), closed houses are preferred, with walls and roofs featuring high-efficiency insulation. For hot-humid regions (Southeast Asia), innovative designs using ventilated ridges + louvered side walls are recommended, reducing construction costs while achieving cooling and dehumidification.
The core challenge in cold-region poultry house design is balancing insulation and ventilation. In Northeast China, winter average outdoor temperatures drop to -20°C.
Building envelope key parameters:
- Walls and roof: Must provide good thermal insulation
- House orientation: East-west long axis recommended to reduce winter wind exposure
- Recommended heating capacity: 0.1 kW/m³ (applicable to Canada and Russia)
Winter house design should be based on minimum ventilation rate — sufficient to remove moisture and harmful gases while minimizing heat loss.
| Parameter | Layer House (Cage) – Winter Standard Value | Reference |
|---|---|---|
| Minimum ventilation rate | 0.70 m³/(h·kg) | Industry standard |
| Recommended indoor air speed | 0.1–0.2 m/s (max ≤0.25 m/s) | — |
| Comfort temperature range (winter) | 18–21°C | — |
| Comfort relative humidity (winter) | 60–70% | — |
| Ammonia concentration threshold (comfort range) | <15 mg/m³ | — |
| Carbon dioxide concentration threshold (comfort range) | <500 mg/m³ | — |
Winter air speed control: Air speeds exceeding 0.4 m/s are detrimental to heat retention. Therefore, the winter minimum ventilation system should operate independently from temperature control, typically using a 5‑minute cycling timer for fan operation (e.g., 1 minute on, 4 minutes off), with house static pressure ≥37.5 Pa to prevent air leakage.
Studies on layer houses in Northeast China indicate that temperature‑based winter ventilation often fails to exhaust harmful gases adequately. The CO₂ equilibrium method is recommended for calculating minimum ventilation rates. Calculations must account for daily water intake, excretion rate (approximately 80% excreted), and indoor/outdoor temperature and humidity differentials.
In hot-humid regions (annual humidity ≥80%, temperatures frequently reaching 32–35°C), the primary design objectives are cooling and dehumidification. Under high temperature and high humidity, birds rely primarily on evaporative heat dissipation (respiratory) and wind chill effect to maintain body temperature.
One field‑validated design for hot-humid climates features: ventilated ridge + single‑layer metal roof + adjustable metal louver side walls. This system was production‑tested in Shenzhen (tropical climate) from 1984 to 1989, demonstrating effective temperature and humidity reduction through natural ventilation alone.
Technical features:
- Louver side walls consist of three sections, manually adjustable for ventilation control
- Metal roof without insulation layer, allowing hot air to exhaust naturally through the ridge vent
Summer ventilation in hot-humid regions should use maximum ventilation rate for fan selection:
| Parameter | Layer House – Summer Recommended Value | Reference |
|---|---|---|
| Maximum ventilation rate | 4.0 m³/(h·kg) | Industry standard |
| Summer comfort temperature (apparent) | 13–26°C (feels‑like) | — |
| Summer recommended air speed | 0.5–1.5 m/s (comfort range) | — |
| Cooling pad efficiency target | 75–80% | Industry standard |
In high-temperature, high-humidity conditions, two methods maintain flock comfort: increasing indoor air speed (preferred) and cooling pad operation (auxiliary). Practical experience from high‑humidity Southern China farms shows:
- Air speed priority: Rely on wind chill to reduce perceived temperature, minimizing the negative humidity impact of cooling pads
- Gradient cooling pad control: Cooling pad water‑on time controlled at 8–15 seconds; temperature drop 0.6–0.8°C to prevent fans from shutting down due to sudden temperature drops
- Target: Before activating cooling pads, maintain indoor humidity approximately 8% lower than outdoor
Innovative cooling pad layouts have been specifically optimized for high-humidity environments to avoid excessive indoor humidity buildup from pad operation.
| Design Dimension | Extreme Cold (Russia/Northeast China) | Hot-Humid (Southeast Asia/West Africa) |
|---|---|---|
| Primary objective | Insulation + moisture removal | Cooling + dehumidification |
| Recommended house type | Closed (environmentally controlled) | Open / louvered natural ventilation |
| Roofing requirement | High-efficiency insulation | Single metal sheet + ventilated ridge |
| Recommended heating capacity | 0.1 kW/m³ | Not required |
| Min/Max ventilation rate | Winter: 0.70 m³/(h·kg) | Summer: 4.0 m³/(h·kg) |
| Winter comfort air speed (max) | 0.25 m/s | 0.2–0.5 m/s (non‑humid season) |
| Summer comfort air speed range | — | 0.5–1.5 m/s |
| Apparent comfort temperature (winter) | 18–21°C | — |
| Ammonia control target | <15 mg/m³ | <15 mg/m³ |
| Special design considerations | Freeze‑proof watering systems, air leakage control | Moisture/corrosion protection, gradient cooling pad control |
- Extreme cold regions (Russia, Northeast China) : Closed environmentally controlled houses are recommended. Walls and roofs must feature high‑efficiency insulation; heating capacity should be no less than 0.1 kW/m³. Winter ventilation should be designed around the minimum rate (0.70 m³/h·kg), with air speeds controlled at 0.1–0.2 m/s, equipped with a 5‑minute cycling timer for precise air exchange, and house static pressure maintained at ≥37.5 Pa.
- Hot-humid regions (Southeast Asia, West Africa) : Natural ventilation design (ventilated ridge + adjustable louver side walls) is preferred. Summer ventilation should be sized at 4.0 m³/h·kg. Cooling pads must be coordinated with air speed control; water‑on time controlled at 8–15 seconds to avoid humidity buildup from sudden temperature drops.
- Equipment supplier opportunities:
- Cold market: Heating systems + freeze‑proof drinking water systems + airtight solutions
- Hot-humid market: Enhanced cooling pad designs + corrosion‑resistant cage materials + smart environmental control systems