Guides
10 posts in Guides.
How to Power a Greenhouse: GFCI, Circuits, and Safe Wiring
A 1,500-watt heater needs a dedicated 20-amp circuit. Every greenhouse outlet requires GFCI protection. Here is the load plan to bring to your electrician.
Greenhouse Permits: Do You Need One to Build a Kit?
Most backyard greenhouses under 200 square feet avoid permits, but foundation type and local jurisdiction are the variables that change everything.
Greenhouse Site Selection: Sun, Wind, and Drainage
Fifteen mph winds can double greenhouse heat loss. The site checklist covering sun hours, orientation, slope, and utility access before you buy a kit.
Greenhouse Ventilation: Fan Sizing and Auto Vent Openers
A 10x12 greenhouse needs a 975 CFM fan. Auto vent openers use wax to open at 55-75 degrees F with no electricity. Without both, heat kills before frost does.
Greenhouse Snow and Wind Loads: What the Ratings Mean
The math behind greenhouse snow load ratings and wind specs, with a verified kit-by-kit comparison and a guide to matching specs to your climate zone.
Greenhouse Summer Cooling: Shade Cloth and Ventilation
Unventilated greenhouses kill summer crops. Shade cloth percentages, fan sizing, and evaporative cooling techniques to keep temperatures in the growing range.
Growing Food in an Unheated Greenhouse All Winter Long
Mache and kale survive to 10°F under minimal protection. This is the crop-by-crop guide to what actually grows in an unheated winter greenhouse.
Cheap Greenhouse Heating: Bubble Wrap, Barrels, and BTU Math
Cut greenhouse heating costs without a furnace. Horticultural bubble wrap, water barrel thermal mass, and a correctly sized heater. Verified June 2026.
Greenhouse Plastic: Mil, UV Life, and Which Film to Buy
6 mil vs woven, clear vs high-diffusion, 4-year vs 1-year: what the spec sheet numbers mean for your growing season and budget. Verified June 2026.
Greenhouse Foundation Guide: Bases That Beat Frost
Greenhouse foundation options compared: treated lumber, gravel, pavers, and concrete, plus frost heave, leveling, permits, and computed base costs for 2026.