Cannabis Grow Room Setup

Choosing Your Grow Space

Popular indoor grow spaces include dedicated grow tents (simplest and most common), spare closets, basement rooms, and purpose-built grow rooms. The space must allow adequate height (minimum 6 feet for comfortable growing and lighting distance), proper electrical outlets, ventilation access, and water drainage or easy transport. Grow tents are the most practical starting point — they include reflective interiors, ports for ventilation, and light-proofing in a contained footprint.

Ventilation and Air Exchange

Proper air circulation is critical for preventing mold, managing heat, and providing CO2. The complete ventilation system includes: an inline fan sized to exchange the room's air volume every 1-3 minutes, a carbon filter at the fan intake to eliminate odor, oscillating fans for canopy-level air movement, and passive intakes for fresh air. For a 4x4x7 tent (112 cubic feet), a 4-inch inline fan rated at 200+ CFM provides adequate air exchange.

Lighting and Electrical

Position lights at the recommended hanging height for your specific fixture (typically 18-24 inches above canopy for LED, 12-18 inches for HPS). Install a timer to automate light schedules — 18/6 for veg, 12/12 for flower. Use appropriate gauge electrical wire and do not overload circuits — powerful grow lights on a single 15A circuit should not be combined with other high-draw appliances. Consider a dedicated circuit for the grow room. Keep all connections away from water.

Temperature and Humidity Management

Cannabis thrives at 70-82°F (21-28°C) with good airflow. High temperatures cause heat stress and terpene degradation. Low temperatures slow growth and can trigger problems in roots. Humidity should be 60-70% for seedlings, 50-60% for veg, 40-50% for early flower, and 35-45% in late flower (to prevent bud rot). Use a digital thermometer/hygrometer combo to monitor conditions. A humidifier, dehumidifier, or AC unit can maintain target ranges in challenging climates.